论文部分内容阅读
为定量研究水动力对土壤分离速率的影响,采用变坡实验水槽方法,在特定水动力条件下,分析黄土高原七种典型土地利用类型土壤分离速率的季节变化。结果表明:(1)不同土地利用下土壤分离速率差异显著,测定期内平均值为谷子>土豆>玉米>大豆>荒坡>草地>林地;(2)除林地外,各土地利用类型土壤分离速率具有明显的季节变化,变化幅度为玉米>谷子>大豆>荒坡>土豆>草地>林地;(3)农地土壤分离速率的季节变化主要由农事活动导致,播种、除草、收获等农事活动可使土壤分离速率提高2～6倍;(4)土壤表层粘结力对各类土地利用土壤分离速率的季节变化具有重要影响。研究结果为进一步分析土壤侵蚀过程和建立侵蚀模型提供了一定的理论基础。
In order to quantitatively study the influence of hydrodynamic force on the rate of soil separation, the seasonal variation of soil separation rate under seven typical land use types in the Loess Plateau was analyzed under the condition of specific hydrodynamic conditions. The results showed as follows: (1) The soil separation rate was significantly different under different land use, and the average values were millet> potato> corn> soybean> barren slope> grassland> woodland during the measuring period; (2) (3) The seasonal variation of the rate of soil separation in farmland was mainly caused by agricultural activities such as seeding, weeding and harvesting, and other agricultural activities Which can increase the soil separation rate by 2 ~ 6 times. (4) The surface soil adhesion has an important influence on the seasonal variation of soil separation rate of all kinds of land use. The results provide some theoretical basis for further analysis of soil erosion process and establishment of erosion models.