Journal of the Japanese Society of Revegetation Technology
Online ISSN : 1884-3670
Print ISSN : 0916-7439
ISSN-L : 0916-7439
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Volume 40, Issue 1
No. 1
Displaying 1-50 of 63 articles from this issue
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ORIGINAL ARTICAL
  • Effects of difference of habitats on growth and concentrations of elements of seedlings planted at a site of clearcutting
    Masazumi KAYAMA
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 3-7
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.3
    JOURNAL FREE ACCESS
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    In March 2006, five species of seedlings (Pinus densiflora, Styrax japonica, Celtis sinensis, Machilus thunbergii, and Eurya japonica) were planted at an abandoned site after clear felling in Kuma Village, Kumamoto Pref. We compared growth characteristics of five species between fertile valley sites and acidic and infertile slope sites. Growths of Pinus densiflora, Machilus thunbergii and Eurya japonica were no difference between valley and slope sites. By contrast, growths of Styrax japonica and Celtis sinensis planted on slope site were suppressed their growths. Styrax japonica and Celtis sinensis planted on slope site showed low concentrations of nitrogen, phosphorus, and calcium in leaves, and these deficiencies considered as suppression of their growth. Stomatal conductance of each species showed no significantly difference between valley and slope sites; therefore, drought stress did not concern with suppression of their growth.
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  • Evaluation of the succession of plant communities revegetated by spraying with plant cultivative base using forest top-soil in north of Kyoto Prefecture
    Koh NAKAMURA, Shinji TANIGUCHI, Makiko ONUKI, Nobuo FUJIWARA
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 8-13
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.8
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    We investigated the long-term succession in plant communities on cut slopes in Kyoto Prefecture, which had been sprayed with plant cultivative base mixed with forest topsoil. We evaluated the process of restoration by surveying the slope vegetation annually for 4 years, and subsequently after 12 years. After 4 years the plant community had changed from one dominated by annual plants to one dominated by Sasa palmata and Miscanthus sinensis. After 12 years, a community dominated by Rhus javanica and Pinus densiflora had formed. During the survey period, the number of tree species increase from 9 to 25, the quotient of similarity (QS) increased from 0.27 to 0.54, and the vegetation came to resemble that of the surrounding area. An increase in the degree of succession (DS) (from 267 to 2716) indicated that succession had proceeded to produce a community dominated by trees. In the first 4 years, however, there were increases in the number of emergent species (S) and diversity index (H'), but thereafter, there were no changes. These results suggest that S and H'are effective for evaluating vegetation restoration during the first 4 years, but thereafter, it is adequate to evaluate restoration using QS or DS.
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  • Introducing semi-natural grassland species in the joints of turf on a river dike
    Shinha ABE, Susumu YAMADA, Masayuki NEMOTO
    Article type: ORIGINAL ARTICLES
    2014 Volume 40 Issue 1 Pages 14-19
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.14
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    River dike construction is usually accompanied by revegetation of bare soil using block sodding of a single turf species. With the aim of developing a technique for introducing several species simultaneously, we performed a 2-year experiment to clarify the effect of different methods of introduction (sowing vs transplanting) and with and without block sodding on the restoration of species representing semi-natural grasslands (Viola mandshurica W. Becker, Adenophora triphylla (Thunb.) A. DC. var. japonica (Regel) H. Hara, Cirsium oligophyllum (Franch. et Sav.) Matsum., and Sanguisorba officinalis L.). Transplanting treatment had higher rates of survival and flowering, and had greater plant height than sowing treatment. Although cover of germinated C. oligophyllum was relatively high in the second year irrespective of with or without block sodding, block sodding increased the survival rate of this species. Survival rate of V. mandshurica decreased markedly in the second year, probably due to the suppression by turf. A. triphylla did not germinate. Introducing floristic species in the joints of turf would be effective for species which grow taller than turf.
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  • Temporal change about media and quantification of the carbon dioxide fixation in the rooftop lawn
    Takanori KURONUMA, Saori HASHIMOTO, Tatuaki ISHIHARA, Takaharu YOSHIOK ...
    Article type: ORIGINAL ARTICLES
    2014 Volume 40 Issue 1 Pages 20-24
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.20
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    We quantified carbon dioxide fixation in the rooftop lawn. There were no annual change about growth of turf grass, although media tended to increase and fixed 0.107 kg-C/m2•yr. Water-holding capacity of media tended to increase, and it was considered that effect of the delay rainwater drainage is improved. From the weight of media tended to increase, we have to take account of weight temporal changes.
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  • Relationship between plant water status and osmotic adjustment in Artemisia ordosica and Caragana korshinskii in Mu Us Sandy land, China
    Yoshikazu OKADA, HuiPing MAO, Norikazu YAMANAKA, Ken YOSHIKAWA, LinHe ...
    Article type: ORIGINAL ARTICLES
    2014 Volume 40 Issue 1 Pages 25-30
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.25
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    The relationship between plant water status and osmotic adjustment was compared between Artemisia ordosica and Caragana korshinskii growing in Mu Us Sandy land, China, in 2008, 2009 and 2010. We studied plant water relations using the p-v curve method and detected several osmolytes including soluble sugars, proline and betaines in leaves of them at pre-dawn and midday. We also measured diurnal changes in leaf water potential and sugar content of both species. The turgor maintenance potential in A. ordosica at midday was higher than that at predawn. Conversely, there was no difference between predawn and midday in C. korsinskii. The total sugar content in A. ordosica at midday was higher than that at predawn, whereas the sugar content in C. korshinskii at midday was not different from that at predawn. In diurnal changes A. ordosica had negative correlation of sucrose content with leaf water potential, whereas no correlation in C. korshinskii. It is concluded that A. ordosica has an ability of osmotic adjustment to diurnal changes in plant water status using sucrose as one of possible osmolytes.
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  • Effects of sand burial on growth and osmotic adjustment in Simon poplar (Populus simonii Carr.) planted in Kubuqi desert, Inner Mongolia, China
    Kandai MIYAZAKI, Yoshikazu OKADA, Makiko TATEISHI, Fukuju YAMAMOTO, Hu ...
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 31-36
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.31
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    Effects of sand burial on growth, osmotic adjustment and Fv/Fm ratio and δ13C in leaves were investigated in Simon poplar (Populus simonii Carr.) saplings planted in Kubuqi desert,Inner Mongolia, China, in August, 2013.Tree heights and annual ring widths in the saplings were rapidly increased as the increase in the depth of sand burial. In leaves of sand-buried saplings on dune slopes, high amounts of accumulated osmolytes including mannitol, a sugar alcohol, and three kinds of betainesas β-alanine betaine, glycine betaine and γ-butylobetaine were detected, suggesting water stress environment on the dune slopes. These results indicate that sand burial enhances growth and development of Simon poplar saplings planted in sand-moving deserts. This species has high ability to accumulate osmolytes to adapt to water stress environment on dune slopes.
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  • Effects of artificial sand burial on growth of Populus simonii, P. alba and Salix matsudana cuttings
    Kandai MIYAZAKI, Yoshikazu OKADA, Fukuju YAMAMOTO, HuiPing MAO, Takesh ...
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 37-42
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.37
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    Effects of artificial sand burial on growth of Populus simonii, P.alba and Salix matsudana cuttings planted and buried at 0 %, 50 %, and 100 % of plant heights with sand were investigated in a dune of Arid Land Research Center, Tottori University. The 100 % sand burial significantly increased height growth and adventitious root formation on buried stems of P. simonii, cuttings of all species. Ethylene production from stem segments of buried cuttings was greatly enhanced at 7 days after the initiation of sand burial. These results suggest that sand burial stimulates ethylene production causing adventitious root formation which may be related to enhanced plant development of sand buried cuttings.
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  • Effects of sea-water flooding of soil on growth of potted Bambusa multiplex (Loureiro) Raeuschel ex Schultes & J. H. Schultes
    Haruna INOUE, Kenichi NAKAGAWA, Takeshi TANIGUCHI, Fukuju YAMAMOTO, No ...
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 43-48
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.43
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    To reduce the salt damages rendered by Tsunami on coastal forests, evaluation of salt tolerance for afforestation plants and selection of salt tolerant plants are essential. In this study, soil of potted Bambusa multiplex, which is native to tropical Asia, were flooded by sea water for 0hr, 24hr, 48hr and 72hr, and changes in plant survival, leaf color, leaf number and Fv/Fm ratio were investigated. The results showed that damages by sea water flooding were increased with increasing flooding period. However, no dead plants were observed in 24hr and 48hr sea water flooding. Leaf color, leaf number and Fv/Fm ratio were damaged by sea water flooding, but recovered finally except for 72hr sea water flooding. Four plants out of five plants survived even in 72hr sea water flooding. These results indicated that B. multiplex was tolerant to short term sea water flooding. It was estimated that B. multiplex was suitable plant for afforestation in coastal areas and around river mouth, where affected by sea water, in south-western part of Japan.
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  • Growth and ion accumulation of Avicennia marina and Kandelia obovata seedlings grown under hydroponic culture with different salinity
    Fumiko IWANAGA, Yoshino NOGUCHI, Fukuju YAMAMOTO, Maimaiti AILIJIANG, ...
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 49-53
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.49
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    Growth, survival rate, Na+ and leaf betaine concentration were investigated on Avicennia marina and Kandelia obovata seedlings grown in hydroponic culture with different salinity for 1-month. Survival rate and biomass of both species did not differ with salinity. In K.obovata seedlings, Na+ concentration in root increased significantly by 4% salt treatment, and ratio of Na+ to K+ increased in hypocotyl and root. In A. marina seedlings, Na+ concentration and ratio of Na+ to K+ in every plant part increased significantly by 2-4% salt treatment. Leaf alanin betaine (AB) concentration did not differ with salt treatment, whereas glycine betaine (GB) concentration in K. obovata and A. marina increased with increase in salt treatment.
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  • Temporal changes in effects of sea water flooding on physiology of Machilus thunbergii, Pinus densiflora and P. thunbergii
    Makiko TATEISHI, Maimaiti AILIJIANG, Masahiro TSUJI, Haruna INOUE, Tak ...
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 54-59
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.54
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    To evaluate chronological trend in damage of salinity on coastal forest species, we monitored transition of damages in Machilus thunbergii, Pinus densiflora and P. thunbergii saplings for three months after see water immersion for 24 hours. The damage was evaluated from discolored-leaves rate by visual observation, and physiological observation using sap flow and chlorophyll fluorescence. Salinity damage appeared dramatically in M. thunbergii, saplings were discolored 1 days later and died 18 days later. P. densiflira saplings were partly discolored within 18 days and most leaves were discolored 38 days later. P. thunbergii, on the other hand, more than 60% of leaves were undamaged at the end of experiments. Physiological parameters indicated damages prior to visual observation in all species. P. thunbergii showed trend of recovery in sap flow and chlorophyll Fluorescence, however, it was not observed visually.
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  • Sap flow movement on Magnolia grandiflora L. and Acer palmatum Thunb. after transplanting for two years
    Shinichi TAKEUCHI, Ai MATSUDA, Yukie NISHI
    Article type: ORIGINAL ARTICLES
    2014 Volume 40 Issue 1 Pages 60-65
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.60
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    To investigate growing roots after tree transplantation, sap flow with the heat ratio method were conducted on two tree species for two years. In case of Magnolia grandiflora L., the highest rate of sap flow was recorded in late July. The seasonal curve of sap flow shows good root development and success of transplantation. In case of Acer palmatum Thunb., two trunks were measured with root balls. One tree had a drainage improved system, while the other was transplanted to bad drainage conditions. Sap flow in the former tree increased favorably and the root system was developed well. However sap flow in the latter tree did not increase and had the sign of poor growth.
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  • Comparison of budburst phenology of Japanese mountain cherry tree between two years using digital colorimetrical images
    Yoshihiko IIDA, Junichi IMANISHI, Yukihiro MORIMOTO
    Article type: ORIGINAL ARTICLES
    2014 Volume 40 Issue 1 Pages 66-71
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.66
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    The difference of budburst phenology in two years was analyzed by comparing canopy color change of 50 individuals of Japanese mountain cherry tree (Cerasus jamasakura (Siebold ex Koidz.) H. Ohba var. jamasakura) using digital colorimetrical images. We identified that a sequence of L*a*b* corresponded to visually observed budburst phenology and the measurement method of digital colorimetrical images was valid for assessment of individual budburst phenology. The pattern of time series of standard deviation (SD) of L*a*b* in the group between 2010 and 2011 was matched after compensation of time-lag days. On the day of maximum SD, the value of L*a*b* between two years was highly correlated. We pointed out that the earliness of canopy colorimetrical changes related to budburst phenology in individuals is yearly stable characteristics.
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  • Phylogeographic study of 10 herbaceous plants native in Japan based on intraspecific chloroplast DNA variation
    Sonoko TSUDA, Soh KOBAYASHI, Motoshi TOMITA, Seiya ABE, Rikyu MATSUKI, ...
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 72-77
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.72
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    Despite of growing public demand for revegetation using local seeds and seedlings, such local seeds are not available commercially for native herbaceous species and even there is no agreed definition of local seed zones. In this study, we investigated the intraspecific chloroplast DNA variations and their geographical distributions of 10 herbaceous plants including 9 grasses and 1 leguminosae native in Japan, as indicators of regionality to determine seed zones of the native herbaceous species. Eragrostis ferruginea, Arundinella hirta, Microstegium vimineum, Calamagrostis epigeios, Imperata cylindrica, and Lespedeza pilosa had both common haplotype being widespread in Japan and some haplotypes those distributions showed regionality, so that suggest us to have enough examinations and discussions when we would consider the regionality. On the other side, other 4 species showed mostly uniform geographical distributions throughout Japan. The statistical test did not show an impact of human activity to the present distribution of haplotypes of any species: allelic richness were not different significantly between sampling spots where surrounding road densities were high or low.
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  • Effects of high temperature throughout the year on the blooming and sprouting of Prunus mume 'Nankou'
    Takuya ONO, Atsushi NAKASHIMA, Hitomi KOUNO, Mao OMINAMI
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 78-83
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.78
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    In this research, to prove the actual effects of global warming on the phenology, especially the blooming and sprouting of Prunus mume 'Nankou', 'Nankou' was grown in a controlled high temperature experiment. The experiment was divided into 4 parts, May 10, Jun. 14, Jul. 19 and Aug. 23, in the year 2011, with the 'Nankou' being transferred into the growth chamber during these 4 parts under two conditions, outdoor temperature and 3℃ warmer than outdoor temperature. Overall results show earlier blooming and sprouting in the 3℃ warmer treatment chamber for the second consecutive year. In addition, in some individuals pre-season defoliation occured in August and September 2011 and the number of flower buds and flowers decreased in 2012 of the warming treatment group. In later observations, the difference due to the starting time of warming was no longer relevant on the phenology, especially the blooming and sprouting, but in the sprouting of 2012 and the blooming and sprouting of 2013 was delayed about two weeks in some individuals of the warming treatment group.
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  • Evaluation of splitting characteristics of magnesium improved soil by image analysis
    Yuma SHIMAMOTO, Tetsuya SUZUKI
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 84-89
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.84
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    In recent years, a large number of researches have focused on building and maintaining infrastructure used regional resources effectively. The purpose of this study is to develop new planting soil mixed with magnesium oxide and rice husk ash (RHA), the waste natural resource, for revegetation fields. In order to develop the good structure material, there needs to examine material properties of the magnesium improved soil mixed with RHA in splitting test. Splitting test was conducted on two types of soil (normal and mixed with RHA). Fracture process was qualitatively evaluated by image analysis and acoustic emission (AE). These results indicate that RHA changes the mechanical property of magnesium improved soil. Two improved soils tend to different characteristics of AE in spitting fracture. By evaluating from image analysis and SiGMA analysis, a relation between concentration of stain, AE event localization and crack mode is correlated.
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  • The relation between users' activity in city parks and health-related QOL
    Yoshitaka OTSUKA, Mamoru NASU, Yukiko TAKAOKA, Yuyeong KIM, Yutaka IWA ...
    Article type: ORIGINAL ARTICLES
    2014 Volume 40 Issue 1 Pages 90-95
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.90
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    An online questionnaire survey was conducted for users of six representative city parks in residential regions within the Tokyo metropolitan area to investigate the relation between users' activity in city parks and health-related QOL. The results of the chi-square test indicated that users' activity was significantly affected by the park' s environment, such as the quality of nature and facility, and by users' attributes, such as sex and age. In addition, walks, nature observation, and conversation significantly influenced users' health-related QOL. Therefore, the park's environment and users' attributes, including their health status, are related to their activity in city parks.
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  • Structuring awareness of the environmental value of community parks and assessing their psychological and economical value
    Mamoru NASU, Yoshitaka OTSUKA, Yukiko TAKAOKA, Yuyeong KIM, Yutaka IWA ...
    Article type: ORIGINAL ARTICLES
    2014 Volume 40 Issue 1 Pages 96-101
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.96
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    To understand the effects of activities on community parks' environmental value, we conducted a survey on residents' awareness of six parks in urban Tokyo; then, we constructed a user awareness model of community parks' environmental value by structural equation modeling (SEM) and assessed the value by psychological and economic indices. SEM revealed that community parks' environmental value is strongly affected by activities. A comparison of user clusters by activity suggested that diversification of activities enhances the parks' environmental value for users both psychologically and economically. This effect was found regardless of park size. We conclude that qualitative measures promoting the diversification of activities are effective in enhancing the parks' value.
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  • Changes in the species composition of plant, bird and dragonfly communities in a recently developed waterside biotope over an eight-year period
    Teruo ARASE, Taizo UCHIDA
    Article type: ORIGINAL ARTICLES
    2014 Volume 40 Issue 1 Pages 102-107
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.102
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    To clarify the early succession of flora and fauna in a newly developed biotope, we constructed a 250 -m2 waterside biotope and monitored annual changes in vegetation and monthly changes in dragonflies and birds from 2005 to 2012. The results showed that the initial colonizing weeds were replaced with species more typical of hydrarch environments. In the shrub layer, no correlation was observed between the number of colonized species over time; however, a liner increase was observed in the cumulative and extant numbers of species over time. In the herbaceous layer, the number of colonized species decreased, while the cumulative number of species increased logarithmically. The number of extant species was not correlated with time. The number of bird species changed in a manner similar to the herbaceous plants, with 33 species observed in the breeding season and 35 in wintering season. Conversely, all 16 dragonfly species had colonized the area within two years of site development, and did not varied up to 2012. The period required for similarity of species composition to decrease by half was estimated to be 5 to 7 years for terrestrial vegetation, 10 to 20 for aquatic vegetation, 40 for dragonflies, and 30 to 60 for birds.
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  • A case study on relationship between environmental conditions inthe lake Biwa canal and surrounding areas and bird communities
    Syushi MIYAMOTO, Wataru FUKUI
    Article type: ORIGINAL ARTICLES
    2014 Volume 40 Issue 1 Pages 108-113
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.108
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    Now, in the city, a form of the ecological network of habits is important. However there are few investigations on linear spaces which consist of the ecological network of habits, and its investigation place concentrate large scale rivers in the suburbs. Therefore this study was intended to clarify the ecological situation of habits in linear space by the bird investigation and land condition in the lake Biwa canal in Kyoto. As a result, it was clear that the urban birds and the forest urban birds ware distributed along the canal in succession densely and the water birds using the canal as their habitat were distributed along it. But the forest birds didn't use the canal as a ecological corridor because they were concentrated on woodland. At an area on the canal in the neighborhood of woodland which was sandwiched houses, we found the forest birds. We thought its condition can be used to later ecological corridor trim.
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  • A study of the relationship between agricultural field form and birds in urban fringe area, Kyoto City
    Azusa HAMADA, Wataru FUKUI, Makoto MIZUSHIMA
    Article type: ORIGINAL ARTICLES
    2014 Volume 40 Issue 1 Pages 114-119
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.114
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    Rural space is one of valuable biological habitat and inhabit various organism. In order to conserve biodiversity of urban fringe area, we need to grasp the relationship of biological and environmental factors of agricultural field. We investigated the relationship between agricultural field and bird at Hirosawaike close to the mountain and Oguraike in the southern part of the Kyoto. We have used the GIS to classify the land use. Classifying the study area by bird survey results, we compared the land use by Scheffe's multiple comparison. As a result, birds and various other forest birds are flying to the point where it is adjacent to the woodlands, such as levee forest and grassland areas are included, increasing the diversity of birds by a variety of land use such as open water and fallow field is included has been clarified.
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  • Fire risk assessment in a secondary forest with a floor dominated by ferns in the dry granite region of Japan
    Junko MORIMOTO, Nao HAMAMOTO, Ryo KOMINAMI, Yoshio MISHIMA, Kenta OGAW ...
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 120-123
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.120
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    The cause of fire ignition and spread, the surface fuel load on the forest floor, should be evaluated for forest fire risk assessment. Fire risk assessment was conducted via unit and total surface fuel in a forest dominated by Dicranopteris linearis in secondary forests in a dry and warm climate region in Japan. Forests with no fire history were ranked with the highest risk of fire via the assessment of unit and total surface fuel. However, the risk assessment results of forests with fire history were completely different. The risk by unit of surface fuel increased across forest age, but the risk by total surface fuel was higher in younger forests that had regenerated after recent fire due to their larger areas. The importance of landscape structure on fire risk assessment was suggested.
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  • Environment and plant regeneration at microsites created by fallen logs in plantation forests downed by wind
    Junko MORIMOTO, Kazumitsu KAJIHARA, Yuichiro SHIDA
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 124-129
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.124
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    The conversion of plantation forests that have suffered strong wind to natural forests has warranted a great deal of research and observation. “Leaving fallen logs” with no salvage logging or site preparation after wind disturbance is critical, but the effects of canopy on microsites on the forest floor are unexplained. We evaluated the function of pits, upside mounds, downside mounds, areas underneath fallen logs, and intact floors for the regeneration of plant species in plantation forests of Abies sachalinensis that had suffered wind disturbance. The results found that 1) the association of regenerated plant species differed between microsites with and without some canopy, and 2) A. sachalinensis exhibited a high regeneration potential in downed forests, whereas Quercus crispula could only regenerate in downed forests with a partially remaining canopy.
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  • Radioactivity reduction experiment and the subsequent erosion in broadleaf hill forest after Fukushima ⅠNPP accident
    Rie YAMAMOTO, Tatsuaki KOBAYASHI, Chisa EBATA, Keita SHINOZAKI, Daichi ...
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 130-135
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.130
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    O horizon removal experiment was performed in broadleaf hill forest which had been extremely contaminated after Fukushima Daiichi Nuclear Power Plant accident. Soil 137Cs decreased to 13.7 % and air radiation decreased to 47.7 % in L-F-H horizon removed plot while air radiation dose decreased to 73∼76 % in L-F horizon removed plot. After the removal treatment, 9.65 % of 137Cs in forest floor had been washed away in L-F-H horizon removed plot during about 5 month. It was 0.64∼0.69 % in L-F horizon removed plot and 0.08 % in control plot. More than 96 % of these flown 137Cs erosion was trapped with fence at the bottom edge of plots. Concentration of dissolved 137Cs which is taken into plants easily was 9.5 Bq/L in control plot, 3.6∼6.5 Bq/L in L-F horizon removed plot and 2.1 Bq/L in whole L-F-H horizon removed plot.
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  • Method to create forest inventory using portable terrestrial laser
    Akira KATO, Yuki ANDO, Toshiya YOSHIDA, Koji KAJIWARA, Yoshiaki HONDA, ...
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 136-141
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.136
    JOURNAL FREE ACCESS
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    Laser scanner is becoming a common technique in creating forest inventory. In this study, one of the most portable laser scanners is used and applied to create forest inventory. Our study area is Nakagawa experimental forest of Hokkaido University. Twenty two research plots have been established to acquire the forest inventory data such as tree height, dbh (diameter at the breast height), crown base, and stem map from the laser data. Accuracy assessment of the laser measurement has been conducted to know the applicability of the portable laser. With this accuracy, the portable laser can be used as a practical tool for forest survey.
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  • Current status of the remaining semi-natural grasslands in Iwate Prefecture and a comparison with past ones on conservation ecology
    Ryusuke ARAI, Kumiko OKUBO
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 1 Pages 142-147
    Published: 2014
    Released on J-STAGE: September 18, 2015
    DOIhttps://doi.org/10.7211/jjsrt.40.142
    JOURNAL FREE ACCESS
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    Semi-natural grasslands in Iwate Prefecture have decreased rapidly in recent decades. To clarify the appropriate methods of the conservation for the plant communities, we surveyed remaining plant communities and compared current and past plant occurrence data. The result showed that current plant communities were dominated by Miscanthus sinensis (Ms1 type, Ms2 type) and Zoysia japonica (Zj1 type, Zj2 type) . Some of species in past M. sinensis communities also occurred in Z. japonica types in this study. According to the management strategy of the M. sinensis communities in past, burning in spring and cutting in autumn was considered to be important for the establishment of the communities. Furthermore, the current plant communities showed the progress of vegetation succession. In order to conserve the communities, we thought that it was necessary to improve the management that cut plants are brought out from ones.
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