【作者】 张雅静； 申向东； 李晓丽；

【Author】 Zhang Yajing1,Shen Xiangdong1,Li Xiaoli1 (1. Inner Mongolia Agricultural University, Hohhot 010018)

【机构】 内蒙古农业大学；

【摘要】 耕作土壤表面空气动力学粗糙度是评价土壤可蚀性的重要指标。本文通过野外实验对阴山北部冬春两季裸露耕地土壤表面的抗剪强度进行测定,利用剪切应力确定该地区耕作土壤表面空气动力学粗糙度。结果表明,利用剪切应力确定的阴山北部耕作土壤表面空气动力学粗糙度与风速无关,主要与土壤表面的物理性质有关。通过对所取土样进行的颗分分析,土样中包含不同粒径的颗粒,并不是均匀粒径的颗粒,得到试区耕作土壤中粒径分布规律。空气动力学粗糙度与土壤中可蚀性颗粒d<0.084㎜,粉沙d<0.05㎜百分含量在自然变化情况下呈负相关。冬春两季土壤物理性质的差异,地面凸凹状况不同使春季地表空气动力学粗糙度小于冬季。同一地点空气动力学粗糙度也不是常数,而是变化的。春季地表粗糙度小为该地区春季剧烈的风蚀作用提供了条件。更多还原

【Abstract】 Aerodynamic roughness length is a important feature to easement soil resistance to wind erosion. The research measured sheer strength of the North of Mount Yin of Inner Mongolia bare cultivated soil, and used the sheer strength to solve aerodynamic roughness length. One of the results is that the aerodynamic roughness length has relationship with soil parameters and has no relationship with wind velocity. The research analyses the sand grain distribution of cultivated surface soil. The soil includes different size grains. When sand grains below 0.084mm, 0.05mm change lightly, the aerodynamic roughness length tends to reduce with those sand grains percent decline. The research also gets that aerodynamic roughness length is not a stable thing. Aerodynamic roughness length in spring is smeller than it in winter. This parameter supplies basic condition to the heavy wind erosion in spring.更多还原