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~(137)Cs法对黄土高原农地土壤侵蚀及泥沙输移规律的研究
Alternative Title~(137)Cs法对黄土高原农地土壤侵蚀及泥沙输移规律的研究
Language中文
文安邦
Thesis Advisor张信宝 ; 何毓蓉
1995
Degree Grantor中国科学院成都山地灾害与环境研究所
Place of Conferral成都
Degree Name硕士
Degree Discipline土壤学
Keyword黄土梁茆区 土壤侵蚀 土壤堆积 泥沙输移
Abstract利用~(137)C_s法对黄土高原梁峁区沟间农耕地--张赵沟研究表明:1)农耕地~(137)C_s含量坡面分布表现为坡地中上部低,坡地底部高,分别为坡地~(137)C_s平均含量的72%,92%和157%。~(137)C_s坡面再分布是径流侵蚀和人类犁耕共同作用的结果,坡地底部~(137)C_s区域背景值和~(137)C_s剖面有效分布深度超过犁耕深度,表明坡地底部存在土壤堆积。2)提出了黄土梁峁区沟间农耕地泥沙输移比研究方法和途径,坡地平均泥沙输移比为0.98。3)坡地土壤侵蚀模数为580-11560t/km~2·a之间,差异侵蚀明显,经地表修正后坡地平均侵蚀模数为6230t.km~2·a。
Other Abstract
The paper deals with soil erosion and sediment transportation of the cultivated land in the hilly region of the Loess plateau, employing Caesium-137 as a tracer. The study site is located Zhaoja gully of Zhichang county, Shanxi province. The main results are as follows: 1) The slope distribution characteristic of Caesium-137 has as follows tendency: Caesium-137 content is low at the middle-upper of the slope land, and high at the bottom of the slope land, Caesium-137 content of the upper middle and bottom part of the slope land is 72%, 92% and 157%, respectively of the Caesium-137 average content of the slope land. The Caesium-137 redistribution on the slope land results from runoff erosion and tilling by mankind. The Caesium-137 content exceeds the Caesium-137 regional background value and the Caesium-137 redistribution depth goes beyond the depth of the tilling layer, these demortrate that a part of soil deposited at the bottom of the slope land. 2) The soil erosion modulus of the slope land is between 580t/km~2·a, and 11560t/km~2·a, and the soil erosion differentiation is obvious among different parts of the slope land. The average soil erosion modulus of the slope land is 6230t/km~2·a. 3) The sediment transportation characteristic and sediment delivery ratio of the slope land are discussed, the calculative formula on the sediment delivery ratio of the slope land is established. The average sediment delivery ratio of the slope land is 0.98.
Document Type学位论文
Identifierhttp://ir.imde.ac.cn/handle/131551/7792
Collection成都山地所知识仓储(2009年以前)
科技与合作处
Recommended Citation
GB/T 7714
文安邦. ~(137)Cs法对黄土高原农地土壤侵蚀及泥沙输移规律的研究[D]. 成都. 中国科学院成都山地灾害与环境研究所,1995.
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