保护性耕作农田抗风蚀效应的灰色关联分析

Gray Correlation Analysis of Conservative Tillage Farmland Anti-wind Erosion Effect

为定量评价中心风速、留茬高度、植被盖度对保护性耕作农田抗风蚀效应的影响,采用野外风洞测试方法进行试验研究,通过计算灰色关联度对试验结果进行灰色关联分析。结果表明:中心风速、留茬高度、植被盖度对保护性耕作农田的抗风蚀效应均有重要影响。其中,3个因素对输沙率影响差异不大,关联度排序为R风速>R植被盖度>R留茬高度;3个因素对截留率影响有一定的差异,影响最大的是留茬高度,其次是植被盖度,关联度排序为R留茬高度>R植被盖度>R风速。

In order to qualitative evaluation the center wind speed,stubble height and vegetation coverage degree＇s effect on conservative tillage farmland anti - wind erosion effect , the paper used the wild wind tunnel testing method to make trial research, and used gray correlation to analyze the testing results by calculating gray correlation degree. The results showed that the center wind speed ,stubble height and vegetation coverage degree had important effect on conservative tillage farmland anti - wind erosion effect. The three factors had few different effect on sand transfer rate, it is wind speed 〉 vegetation coverage degree 〉 stubble height for the correlation sorting; but they had some different effects on retention rate, the stubble height is the most one , then the vegetation. It is stubble height 〉 vegetation coverage degree 〉 wind speed for the correlation sorting.