玉米茎秆汁液对黄土坡面产沙速率的影响及原因分析

利用人工模拟降雨试验研究了玉米茎秆汁液对黄土坡面产沙速率的影响及其原因。试验设计了4种不同的土样处理方式（control、添加25%浓度的汁液、添加50%浓度的汁液、添加25%浓度汁液经过一个冬季的冻融降解）在4种不同雨强（25，50，75，100 mm/h）下对产沙速率的影响，分析了4种不同处理后土样的土壤团聚体、有机质跟产沙速率的关系。结果表明:（1）添加玉米茎秆汁液对产沙速率是有明显的抑制作用的，玉米茎秆汁液通过增加土壤中 > 0.25 mm的团聚体和有机质实现减沙作用的。（2）4种处理后的土样中 > 5 mm的土壤团聚体和有机质是显著线性相关的，通过了0.01的显著性水平。在各种试验雨强（25，50，75，100 mm/h）下的产沙速率与 > 0.25 mm的土壤团聚体、有机质都具有显著线性负相关关系，通过了0.01的显著性检验。

Influence and Cause of Corn Stalk Juice on Sediment Yield Rate on the Loess Slope

Using simulated rainfall, we investigate how the corn stalk juice impacts the sediment yield rate on loess slop. Four treatments of corn-stalk-juice-treated soil and four rainfall intensities are designed to study the sediment yield rate. The soil treatments include a control group, corn-stalk-juice-treated groups with 25% concentration and 50% concentration, and a group treated by corn juice with 25% concentration and freeze thaw control. The rainfall intensities are set as 25 mm/h, 50 mm/h, 75 mm/h, 100 mm/h. The relationship among soil aggregates, organic matter and sediment yield rate was analyzed for the four soil treatments. The results indicated that: (1) the corn stalk juice could remarkably reduce the sediment yield rate via increasing the >0.25 mm aggregates and organic matter; (2) there is a significantly linear correlation between the >0.5 mm aggregates and organic matter in the four soil treatments; there is a significantly negative linear correlation between sediment yield rate and >0.25 mm soil aggregates as well as organic matter.