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。
The energy equation of runoff in different slopes is showed here. The biggest slope degree ()is 45.The actually maximum transport of soil grains and all splash capacity from rainsplash impact in downslope occurred 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 21.445and the slope degree in loess soil was about 28.
出处
《水土保持研究》
CSCD
1999年第2期42-46,共5页
Research of Soil and Water Conservation
关键词
土壤侵蚀
临界坡度
黄土高原
坡地
soil erosionthe critical slope degreeloess plateau
