河北坝上不同土地利用方式下土壤表层水分变化对风蚀的影响

土壤风蚀是引起干旱半干旱地区土地退化的主要因素,风蚀强度取决于土壤分布区的自然环境及土壤本身的性质,随着人类活动强度的加大,土地利用、土地覆被及其所引起的土壤表层水分变化成为影响土壤风蚀的主要因素。本文利用2 0 0 2年36月期间在河北坝上丰宁县野外试验并观测到的不同土地利用方式下土壤湿度及风蚀量数据,通过定量分析,比较不同土地利用方式及其土壤含水量对风蚀的影响。结果表明,土壤风蚀的强弱主要取决于土地利用方式及土壤表层含水量。草地和林地在抗风蚀方面要强于耕地,土壤表层含水量对风蚀的影响突出地表现在耕地中,据此,人类可通过改变土地利用方式,其次是在春季增加土壤表层湿度,二者结合才能有效减缓该区域内的土壤风蚀强度

Wind Erosion is Influenced by Way of Land Using and Soil Surface Humidity Changing in Spring in Bashang Region of Hebei Province

Wind erosion is one of main reason to caused soil degeneration in arid and semiarid region. The intensity of wind erosion is decided by local environment and soil characteristic. With increasing of human being activity intensity. Land using, land cover and soil surface humidity changing are became main factors to influence soil erosion. In this paper, the measured data of soil surface humidity and its erosion quantity are analyzed in Fengning Country of Hebei Province from March to June 2002. Soil humidity which influencing soil erosion are studied and then compared according to the way of different land using. The result show: The main factors to influence soil erosion are the way of different land using and soil humidity. Grassland and woodland are bigger than infield in anti-wind-erosion process. Soil surface humidity is take important part in the process of wind erosion in infield. According which the way of land using adjusted and then to increased soil surface humidity in spring. Wind erosion will be reduced in this region.