摘要
采用人工模拟降雨装置研究降雨强度为104.24mm/h时三峡库区5°紫色土坡面的养分流失规律。研究表明:在降雨后坡面表层土各养分均呈现减小的趋势,土壤全量养分流失量表现为坡腰>坡脚>坡顶。随土层加深,土壤剖面养分富集现象越明显。侵蚀泥沙养分在产流过程中呈先增加后减小的变化特征,泥沙携带全量养分含量大小顺序为有机质>全钾>全磷>全氮,有效养分含量大小顺序为速效钾>碱解氮>有效磷。侵蚀泥沙养分与产流历时间的关系为线性函数、二次函数和幂函数,养分不同函数表达不同,而径流总氮、总磷与产流历时的关系均可用幂函数表达。
With simulated rainfall equipment, the pattern of soil nutrients from purple soil of Three Gorges Reservoir areas under rainfall intensity which was 104.24 mm/h and 5° runoff plots was studied. The results were as follows.. The topsoil nutrients showed a decreasing trend after rainfall. Nutrient loss was. Middle button 〉top of the slope. Almost all nutrients were manifestations of nutrient enrichment in soil profile, and the deeper soil profile was, the higher nutrient enrichment was. Change characteristics of eroded sediment, the total nutrient content order of magnitude was as follows： Organic matter 〉TK 〉TP〉TN; available nutrients order of magnitude was： AK 〉AN 〉AP. Erosion sediment nutrient duration regression equation could be summarized as linear, quadratic, and power function. Different nutrient function had different forms. But the runoff TN and TP duration regression equation could be expressed by power function.
出处
《水土保持学报》
CSCD
北大核心
2013年第1期31-34,40,共5页
Journal of Soil and Water Conservation
基金
中央高校基本科研业务费专项资助项目(XDJK2011C013)
国家科技支撑计划项目(2011BAD31B03)
西南大学博士基金项目(SWU110023)
西南大学生态学重点学科"211"工程建设经费资助项目
