Zhao Xiaoguang,Wu Faqi,Liu Bingzheng,et al.The Critical Slope Degrees of Soil Erosion[J].Research of Soil and Water Conservation,1999,6(02):43-47.
再论土壤侵蚀的坡度界限
- Title:
- The Critical Slope Degrees of Soil Erosion
- Keywords:
- soil erosion; the critical slope degree; loess plateau
- 摘要:
- 通过理论推导了坡面径流能量方程，实测雨滴击溅坡面土粒的最大向下迁移量、溅蚀总量等均发生在30°以下；又通过对不同坡度坡面土壤结构的测定分析，发现随坡度变化，土壤的粗颗粒含量、紧实度以及水分入渗速率及土壤团聚体的团聚结构、团聚度、分散度均发生较明显变化，这些因素均可使坡面侵蚀量发生变化。据此分析得出，土壤侵蚀的临界坡度不是一个定值，是以上各因子相互作用的结果，在黄土高原其值介于21.4～45°之间，黄绵土的临界坡度约为28°。
- Abstract:
- The energy equation of runoff in different slopes is showed here The biggest slope degree (θ) is 45°. The actually maxinum transport of soil grains and all splash capacity from rainsplash inpact in downslopeoccurred in slope degrees below 30° Results from soil structure in different slopes showed that as slopes varied the content of large soil grains, soil compaction, water infiltration, soil aggregation, aggregative degree and dispersity obviously changed Factors above caused change of erosion. The critical slope degrees, which resulted in soil erosion, also changed The slope degrees in loess plateau were between 21.4-45° and the slope degree in loess soilwas about 28°.
参考文献/References:
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2 Renner. F. G., Conditions Influencing Erosion of the Boise River Watershed V. S. Dept Agric Tech Bull. 528. 1936
3 陈法扬.不同坡度对土壤冲刷量影响试验.中国水土保持, 1995(2)
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8 [日]三好洋原宽著.土壤物理性质与土壤诊断.周顺行, 毛礼钟译.北京:农业出版社, 1986
9 江忠善, 贾志伟, 刘志.降雨和地形因素与坡地水土流失关系的研究.中国科学院资料环境科学局主编.黄土高原小流域综合治理与发展.北京:科学技术文献出版社, 1992, 300～309
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备注/Memo
收稿日期:1999-4-15