关键词: 发芽特性, 发芽特性

Abstract: In order to investigate the variation of anti-scourability of soil after dry-wet alternation processes in growing season, this study investigated the anti-scourability of four typical types of soil under different dry-wet alternation treatments using undisturbed soil scouring method. The results showed that the influence of drywet alternation on anti- scourability of soil was related with soil type. Loessial soils’anti- scourability was relatively lower and didn’t vary obviously after dry- wet alternation treatment. The coefficient of antiscourability of loessial soils practically remained below 2.5 L·min/g in all treatments. Black soil in northeast China and purple soil in central Sichuan presented had obvious variation of anti-scourability after dry-wet alternation treatment, and the coefficient of anti- scourability would increase above 12.0 L·min/g to 16.0 L·min/g. In the scouring process, the anti-scourability had an increasing trend which was related not only to the measuring device, but also to the nature of soil. For different soil types, the change of anti-scourability during growing season should be divided into influence from crop roots and soil itself, especially for soils that had high anti- scourability. For loessial soil or other soils with low anti- scourability, avoiding scouring of concentrated flow is the key for erosion control.