初始含水量对黑土坡面养分流失的影响  

Effect of Initial Soil Water Content on Nutrient Loss of Black Soil Slope

作　　者：李德明[1] 郭成久[1] 宁睿[1] 

机构地区：[1]沈阳农业大学水利学院,沈阳110866

出　　处：《水土保持学报》2014年第5期17-20,36,共5页Journal of Soil and Water Conservation

基　　金：辽宁省自然科学基金项目(20102197)

摘　　要：为了深入了解初始含水量对黑土坡面养分流失的影响特征,采用室内模拟降雨的方法,对不同初始含水量条件下的黑土坡面养分（N、P、K）流失进行研究。结果表明：黑土中硝态氮的流失量随初始含水量增大而增加,在初始含水量较低时以淋失为主,在初始含水量较高时则以随坡面径流流失为主;黑土中速效磷和速效钾流失量随初始含水量的增大表现为先减少后增加,二者流失量与土壤初始含水量呈近似抛物线关系。通过分析确定黑土最优初始含水量为20%~21.27%。An experiment was conducted for understanding the initial water content how to impact the nutrients（N,P,K）loss of the slope of black soil by simulating rainfall.Results indicated that the nitrate in the black soil runoff increased with the increase of the initial water content.When the initial water content was lower,the nitrate was given priority to with leaching.The high initial water content was given priority to with the slope runoff erosion.The available phosphorus and available potassium loss of the black soil firstly decreased then increased with increasing initial water content.Both loss and the initial soil water content were approximate parabola relationship.Through the analysis of experimental data processing,it was determined that the black soil optimal initial water content was 20%~21.27%.

关 键 词：初始含水量 黑土坡面 养分流失 

分 类 号：S153.6[农业科学—土壤学] S157.1[农业科学—农业基础科学]