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Article type: Cover
2015 Volume 59 Issue 2 Pages
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Published: December 31, 2015
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Article type: Appendix
2015 Volume 59 Issue 2 Pages
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Article type: Appendix
2015 Volume 59 Issue 2 Pages
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Article type: Appendix
2015 Volume 59 Issue 2 Pages
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Article type: Index
2015 Volume 59 Issue 2 Pages
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H. TAKESAKO
Article type: Article
2015 Volume 59 Issue 2 Pages
39-40
Published: December 31, 2015
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Siriguleng, Kenta IKAZAKI, Atsunobu KADONO, Le CAO, Yume KANG, Jun YA ...
Article type: Article
2015 Volume 59 Issue 2 Pages
41-51
Published: December 31, 2015
Released on J-STAGE: June 30, 2018
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Grassland degradation has been caused by overgrazing in Inner Mongolia. Previous studies revealed the effect of grazing pressure on the vegetation and soil. However, that of different land use types (i.e., grazing and mowing) has not been fully understood, though land use has been dramatically changed from grazing to mowing after land contract system was introduced in 1996. The objective of this study, therefore, was to evaluate that effect on the vegetation and soil. We conducted vegetation and soil surveys in the control (where grazing has been prohibited for 15 years), mowing (where land use was changed from grazing to mowing about 20 years ago), grazing (where land use is grazing for the last 20 years) plots in Hulunbuir grassland, Inner Mongolia. We found that (1) plant coverage rate, above-ground biomass, and number of plant spices were approximately control >mowing >grazing, (2) for the soils of A1 horizon, bulk density was mowing ≈grazing >control, pH was control ≈mowing >grazing, organic carbon and total nitrogen contents were control >mowing >grazing, and soil respiration rate was control ≈mowing >grazing. These results showed the severe vegetation and soil degradation in the grazing plot and certain level of vegetation degradation in the mowing plot, but limited soil degradation in the mowing plot. However, soil in the mowing plot seems to be on the road to degradation since most above-ground biomass is not returned to the soil as well as in the grazing plot. This study provides important information for the appropriate management of the grassland in Inner Mongolia.
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Le CAO, Kenta IKAZAKI, Atsunobu KADONO, Siriguleng, Soh SUGIHARA, Tak ...
Article type: Article
2015 Volume 59 Issue 2 Pages
52-62
Published: December 31, 2015
Released on J-STAGE: June 30, 2018
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The recent increase in the number of tourists has raised serious concerns about grassland degradation by tourism activities in Inner Mongolia. Thus, we evaluated the effects of tourism activities on the vegetation and soil in Hulunbuir grassland. We identified all the plant species, measured the number and height of plants and plant coverage rate, calculated species diversity, and estimated above-ground biomass in the used plot and the non-use plot. We also examined soil hardness, and soil physical and chemical properties in both plots. The obtained results were as follows: a) the height of the dominant plants, plant coverage rate, species diversity, and above-ground biomass in the used plot were significantly lower than those in the non-use plot, b) Carex duriuscula C.A.Mey., indicator plant for soil degradation, was dominant in the used plot, c) OC, TN, LFC, LFN and CEC in the topsoil were lower in the used plot than the non-use plot possibly because of the decrease in plant residue input, and d) soil hardness was significantly higher in the used plot than in the non-use plot and spatial dependence of soil hardness was only found in the used plot (range was 111m). On the basis of the results, we concluded that the tourism activities can be another major cause of the grassland degradation in Inner Mongolia and that when tourism facilities are moved to avoid further land degradation by tourism activities, they should be moved more than 111m away from the original location.
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Apuntree PRUEKSAPONG, Tetsuhiro WATANABE, Shinya FUNAKAWA
Article type: Article
2015 Volume 59 Issue 2 Pages
63-73
Published: December 31, 2015
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Surin Province has long been used to cultivate Thai jasmine rice, yield of which is strongly affected by topographical positions of paddy fields. The present study was conducted to investigate the characteristics of Surin paddy soils at high and low topographical positions in Tha Tum and Chom Phra districts in Surin Province. Differences in nutrient leaching and accumulation according to water stagnation and drainage at each topographical position were observed. Soils in the study area had a sandy texture, high acidity, low nutrient levels, and low water holding capacity, all of which were more serious at high topographical positions. Soils at low topographical positions were less acidified, having pH values of ≥5.8 at lower horizons and one soil showed incipient soil salinization. The difference between these soils at high and low elevations in both districts indicated that soils at high positions are at risk of nutrient and water deficiency because of leaching, while those at low positions have a risk of soil salinization.
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Kenji TAMURA, Toshiaki OHKURA, Keiko MORI
Article type: Article
2015 Volume 59 Issue 2 Pages
74-
Published: December 31, 2015
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Kazutake KYUMA
Article type: Article
2015 Volume 59 Issue 2 Pages
75-89
Published: December 31, 2015
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Shizuo NAGATSUKA
Article type: Article
2015 Volume 59 Issue 2 Pages
90-96
Published: December 31, 2015
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Tetsuo ANZAI
Article type: Article
2015 Volume 59 Issue 2 Pages
97-102
Published: December 31, 2015
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Tomoyuki HAKAMATA
Article type: Article
2015 Volume 59 Issue 2 Pages
103-107
Published: December 31, 2015
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J. TAKAHASHI
Article type: Article
2015 Volume 59 Issue 2 Pages
108-109
Published: December 31, 2015
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Article type: Appendix
2015 Volume 59 Issue 2 Pages
110-111
Published: December 31, 2015
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Article type: Appendix
2015 Volume 59 Issue 2 Pages
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Published: December 31, 2015
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Article type: Appendix
2015 Volume 59 Issue 2 Pages
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Article type: Appendix
2015 Volume 59 Issue 2 Pages
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Published: December 31, 2015
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Article type: Appendix
2015 Volume 59 Issue 2 Pages
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Published: December 31, 2015
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Article type: Appendix
2015 Volume 59 Issue 2 Pages
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Article type: Cover
2015 Volume 59 Issue 2 Pages
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Published: December 31, 2015
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Article type: Index
2015 Volume 59 Issue 2 Pages
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Published: December 31, 2015
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