中央ネパール・カリガンダキ河流域に分布する土壌の気候的遷移について : I.一般的性質
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概要
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This study was conducted for the purpose of determining some properties and distribution of soils present in Kali Gandaki valley located in Cental Nepal, which was climatologically divided into 6 zones : humid subtropical, humid temperate, subhumid temperate, semiarid temperate and arid temperate from the south to the north and subalpine zone with elevations ranging from 3000 to 4000 m. The results obtained showed a considerably clear variation in some soil properties and soil distribution brought about by the differences in climatic conditions. 1) The pH value and carbonate-C content increased with increasing aridity from the humid sutropical zone to the arid temperate zone. 2) The organic carbon content and the CEC of surface horizons increased from the humid tropical to the humid and subhumid temperate and then decreased from the arid temperate to the semiarid temperate. The pattern of changes with respect to climate was also observed for the exchangeable base or NH_4OAc (pH 7)-extractable base content except for Na. 3) The C/N ratios of the surface horizons were higher in the semiarid temperate and in one part of the arid temperate region than in the other zones. 4) The base saturation generally increased from the humid subtropical to the subhumid temperate through the humid temperate, though a significantly high base saturation was observed in one part of the humid temperate zone. 5) The properties of the soil in the subalpine region were nearly the same as those of the humid temperate soils. 6) With regard to classification of the soils in each region, Dystric Cambisols in the humid temperate and in one part of the humid subtropical zone, Haplic Phaeozems in the subhumid temperate and in one part of the humid subtropical zone, Calcic Chernozems in the semiarid temperate, and Calcic Regosols in the arid temperate were recognized. The soil in the subalpine zone presumably belonged to Dystric Cambiosols.
- 日本ペドロジー学会の論文
- 1985-06-30
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関連論文
- 中央ネパール・カリガンダキ河流域に分布する土壌の気候的遷移について : II.土壌有機物の蓄積と腐植組成
- 中央ネパール・カリガンダキ河流域に分布する土壌の気候的遷移について : I.一般的性質
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