摘要
以覆盖农田地表的春小麦秸秆残茬为试验材料,通过风洞试验研究了作物秸秆残茬的高度、覆盖度(密度)对防治农田土壤风蚀的效应;进一步分析了作物秸秆残茬的高度、覆盖度与农田地表粗糙度的关系。结果表明:随着作物秸秆残茬高度和覆盖度的增加,作用在作物秸秆残茬上的剪切力增加,而作用在裸露地表上的剪切力减少。作物秸秆残茬的高度和覆盖度与农田地表粗糙度的相关系数分别为0.929,0.910,这说明作物秸秆残茬的高度和覆盖度对农田地表粗糙度均有影响,但程度不同。粗糙度与秸秆残茬高度和密度拟合的幂函数方程指数为1.59(均值),e的均值为1.17,可见相对于秸秆残茬的覆盖度而言,高度对粗糙度的影响更大。
Crop straw and stubble coverage can reduce the shearing force upon soil surface by wind and therefore effectively restrain soil wind erosion. In this paper, the effect of preventing soil wind erosion by different heights of crop stubble and different coverage ratios was studied by means of wind tunnel especially enrichment in the conventional tillage field with spring wheat straw and stubble. The relationship among the height of stubble, coverage ratio and the roughness of soil surface Z0 was further analyzed. The results showed that the shearing force upon crop straw and stubble increased and upon bare soil surface decreased with the increase of the height of crop stubble and coverage ratio. Both stubble height and coverage ratio have an effect on the roughness of soil surface Z0 to different degrees. The height of stubble is positively related to the roughness of soil surface Z0 .
出处
《吉林农业大学学报》
CAS
CSCD
北大核心
2004年第2期170-173,178,共5页
Journal of Jilin Agricultural University
基金
中澳合作项目资助(ACIAR 96/143)
关键词
保护性耕作
残茬覆盖
防治
农田
土壤风蚀
试验
conservational tillage
crop straw stubble
coverage
soil wind erosion
