| 姚军,吴发启,宋娟丽,佘雕,李光录.黄土高原沟壑区坡耕地表层土壤抗剪强度影响因素分析[J].干旱地区农业研究,2010,28(3):236~239 |
| 黄土高原沟壑区坡耕地表层土壤抗剪强度影响因素分析 |
| Analysis of influence factors on the shearing strength of the topsoil of sloped farmland of gully regions in the Loess Plateau area |
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| DOI：10.7606/j.issn.1000-7601.2010.03.43 |
| 中文关键词: 坡耕地 表层土壤 抗剪强度 含水量 雨强 坡度 |
| 英文关键词:sloped farmland topsoil shearing strength water content rainfall intensity gradient |
| 基金项目:中国科学院知识创新工程项目“黄土高原水土保持与生态环境建设试验示范研究”(KZCX2-XB2-05-01) |
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| 中文摘要: |
| 以淳化坡耕地为研究对象,在人工模拟降雨条件下,设计降雨强度分别为0.5、1.0、1.5、2.0、2.5mm/min,降雨历时40 min,设计坡度分别为5°、8°、11°、15°2、0°,分析了影响黄土高原沟壑区坡耕地表层土壤抗剪强度的3个主要因素:含水量、雨强及坡度。结果表明,降雨结束后,随着表层土壤含水量的降低,抗剪强度会随之增加,相关性较好;雨强对抗剪强度影响不大;坡度较小时抗剪强度会随坡度增加而降低,当坡度增加到15°以上时,随坡度增加抗剪强度随之增加。 |
| 英文摘要: |
| Taking the sloped farmland of Chunhua County as the object , under the situation of the manual simula-tion rainmaking, and the designed rainfall intensity as following: 0.5, 1.0, 1.5, 2.0 mm/min and 2.5 mm/min, dura-tion of rainfall: 40 min, and the designed slope gradient as following: 5°, 8°, 11°, 15° and 20° , this paper analyzes the
three main factors: water content, rainfall intensity and gradient, which influences the shearing strength of the topsoil of sloped farmland of the gully region in the Loess Plateau area. The results show that, after the rainmaking, the shearing strength will increase with the decreasing of the water content of the topsoil. The pertinence between these two factors is pretty obvious . The rainfall intensity has less influence on the shearing strength. When the gradient is small, the shearing strength will decrease with the increase of the gradient. When the gradient reaches 15°or more, the shearing strength will increase with the increase of the gradient. |
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