水土保持学报2011，Vol.25Issue(1)：25-29,5.
土壤前期含水量对棕壤土坡耕地养分流失的影响
Effect of Antecedent Soil Moisture on Nutrient Loss form Brown Loam Slope
摘要
Abstract
Study on properties of nutrient loss from brown soil in sloping land under different soil moisture content using artificial rainfall simulation test method. The result indicated that the soil nitrate nitrogen loss is mostly as the form of leaching while the soil moisture below 20 ％, beside that it is also lost as the form as runoff when the soil moisture is above 20％. With the increase of rainfall duration the phosphor and potassium ion concentration in the runoff will be decreased, and the loss has a parabola relation but not a linear relation with the soil moisture, inflexion is existing when the earlier moisture is between 10％ and 15％. The relationships among the losses of NO3- -N, SEP, DP , K+ and sediment losses and antecedent moisture contents may be described by a quadratic equation. In addition, the optimal antecedent moisture contents corresponding to the least losses of the nutrients were estimated based on the quadratic equation, and the optimal antecedent water content was 11.32％～15.65％.关键词
土壤前期含水量/地表径流/养分流失/棕壤土坡耕地Key words
the soil moisture content/ surface run off/ nutrient loss/ brown loam slope分类
农业科技引用本文复制引用
赵野,苏芳莉,崔彬,李煜,郭成久..土壤前期含水量对棕壤土坡耕地养分流失的影响[J].水土保持学报,2011,25(1):25-29,5.基金项目
辽宁省自然科学基金(20102197) （20102197）
