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Volume 43 (2001)
- Issue 2 Pages 33-
- Issue 1 Pages 1-
Volume 43, Issue 1
Displaying 1-4 of 4 articles from this issue
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Xiaoniu Xu, Eiji Hirata, Yoshihiro Tokashiki, Tsutomu Enoki, Takeo Shi ...Article type: Article
2001 Volume 43 Issue 1 Pages 1-8
Published: August 17, 2001
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSThis study sought to determine the effects of forest type on soil properties. Two forest types were evergreen broad-leaved forest and pine plantation. The level of organic C and total N were similar in the mineral soil under both forest types. The surface mineral soil (A and/or AB horizons) under pine plantation had high pH, high exchangeable Ca^<2+>, low exchangeable Al^<3+> and available P compared to evergreen broad-leaved forest. No differences occurred for exchangeable K^<+> and Na^<+> between both forest types. Exchangeable K^<+>, Ca^<2+>, and Mn^<2+> showed a steep decrease with depth, while Al^<3+> and Na^<+> exhibited little change in both forests. Soil pH increased with depth under evergreen broad-leaved forest, but kept constant under pine plantation. Also, evergreen broad-leaved forest had lower bulk density, and higher total porosity in surface soil horizons than pine plantation. However, there were no differences for physical and chemical properties of lower soil horizons (B2 horizons) between both forest types. The cluster analysis indicated that the differences in surface soil horizons between the two forest types were contributed to the effects of different forest composition.View full abstractDownload PDF (806K) -
Masahiro Saito, Takeo Tanimoto, Li-yun Zhang, Zheng-wu LiArticle type: Report
2001 Volume 43 Issue 1 Pages 9-15
Published: August 17, 2001
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSSoil size composition and salt accumulation were investigated in the Taklimakan Desert and the Hexi Corridor, arid area in the northwest of China. The soil was including large gravels over 10 mm in the size, in the upper parts of alluvial fan, pediment and wadi, and the soil in the lower pediment mainly consisted of the sand about 0.2 mm in the size. On the electric conductivity (EC) and NaCl content, salt accumulation have been occurred lightly on some soil samples from the middle to low part of the pediment. The upper-edge of the Tamarix cone has high saline concentration, it decreases as going down, and on the center and bottom of it the salinity is very little. Though in surface soils under the young coppice forests of Populus puruinosa and P. euphratica, EC and NaCl content were shown over 20 mS/cm and over 1.5%, these values dropped as it to the lower layer. EC value was 0.2 mS/cm in the midle of soil profile under the P. pruinosa forest, while it was 2-5 mS/cm in same layer under the P. euphratica forest. This difference of the soil salinity seems to reflect the difference of salt tolerance between the two Populous species. The results of survey on the mixed forest of these poplars on a flood plain, also supported difference of the salt torelance between both species. The degree of salt accumulation on the soil was evaluated on 8 land-forms by EC and NaCl content. In most of samples from sand-dune and pediment, the salt accumulation had not been caused, however, in few ones were shown lightly salt accumulation by the salt except for NaCl. In the flood plain, there were two types of salt accumulation, by NaCl or other kinds of salt, while in the salt accumulation area the accumulated salt was mainly NaCl.View full abstractDownload PDF (1132K) -
Akira Komiyama, Nami Ukai, Shogo KatoArticle type: Report
2001 Volume 43 Issue 1 Pages 17-21
Published: August 17, 2001
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSDeciduous broad-leaved trees show a remarkable specific difference in the leaf-flush period in spring. Even under the closed canopy, the light condition of forest floor becomes heterogeneous by place, because of the leaf phenological traits of upper trees. In order to study the influence of this seasonal light regime on the growth of understory plants, the transplanting experiment of Impatiens textori, an annual herbaceous species, was conducted in a ca. 100-year-old forest. Five plots were established under the canopies of early-, intermediate-, and late-flushing trees, and the elongation pattern of main stems of transplanted individuals was monitored. It is elucidated that the growth increments of them were large in the place under influence of the late-flushing-tree canopy, that supplied large amount of photosynthetic photon flux density to the forest floor for a long period in spring.View full abstractDownload PDF (742K) -
Takuo KitabatakeArticle type: Report
2001 Volume 43 Issue 1 Pages 23-26
Published: August 17, 2001
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSDownload PDF (830K)
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