植物篱对紫色土区坡地土壤可蚀性变化影响

Effects of Hedgerow to the Soil Erodibility Changes on Sloping Farmland in Purple Soil Area

基于土壤分形维数及EPIC模型,研究紫色土区坡耕地不同土地利用方式下定植新银合欢植物篱对坡面土壤分形特征及可蚀性的影响作用。结果表明:定植植物篱能提高坡面土壤粘粒含量,对坡面小区土壤整体的可蚀性没有明显影响。土壤分形维数与砂粒、粉粒含量呈负相关,与粘粒含量呈正相关;土壤可蚀性K值与粉粒含量呈极显著的正相关,相关系数为0.957;与分形维数、砂粒含量、粘粒含量及有机碳含量呈负相关,相关系数分别为:-0.589,-0.668,-0.603,-0.286。

On the bases of the fractal dimension and EPIC model, it is studied the effect of planting L. leucocephala hedgerows on soil fraetal feature and soil erodibility on sloping cropland of Purple Soil Area. The results show that, the plantation of hedgerows may increase the content of soil clay on the slope while has no significant impact on the erodibility of the whole soil on the slope plots. There was a positive influence on soil organic matter accumulation on slope farmland plots by planting the hedgerows. Soil fractal dimension was correlated negatively with sand and silt particles, and positively with clay particles. There was a significant positive correlation between soil erodibility K and soil silt particles content, with the correlation coefficient of 0.957. There was a negative correlation between soil erodibility K and fraetal dimension of soil particles, soil sand particles content, soil clay particles content and OC content, with the correlation coefficient of - 0. 589, - 0. 668, - 0. 603, and - 0.286 respectively.