紫色土丘陵区不同耕作模式土壤抗冲性对比分析

Comparative Analysis of Soil Erosion Resistance under Different Land Use Patterns in Purple Soil Hilly Region

基于径流小区定位观测研究,分别研究紫色土丘陵区坡耕地不同耕作模式(横垄、顺垄、混合耕作)和不同土层(0～15 cm、15～30 cm)对土壤径流冲刷过程中径流含沙量及抗冲指数的变化特征的影响,以及影响因素的内在关系。研究结果表明:(1)在整个冲刷过程中,不同土层土壤表面径流泥沙流失量呈递减趋势,最后基本趋于稳定;(2)在整个冲刷过程中,径流泥沙流失量总体表现为0～15 cm土层>15～30 cm土层,这主要与土壤剖面特性有关,而农业耕作和根系的影响占次要地位;(3)在各种耕作模式中,抗冲指数的大小均表现为0～15 cm土层<15～30 cm土层,且后者分别是前者的2～3倍。

Based on located observation on runoff plots,effects of tillage patterns（transverse ridge,downslope ridge mixed tillage） different soil layers（0-15 cm 15-30 cm） on variation of sediment yield of runoff soil erosion resistance and the correlations among these factors were examined.Result shows that：（1）sediment yield of surface runoff decrease over the scouring process,and finally approximate a constant;（2） sediment yield runoff in 0-15 cm layer is larger than that in 15-30 cm layer,which is probably related to the different soil properties for different soil layers;（3） for all tillage patterns,the order of the soil erosion resistance is 0-15 cm layer15-30 cm layer,and the latter are 2-3 times as large as the former.