模拟降雨条件下海南花岗岩砖红壤中氮素的迁移特征研究.docVIP

海 南 大 学 毕 业 论 文（设计） 题 目：模拟降雨条件下海南花岗岩砖红壤中氮素的迁移特征研究 学 号： B 0 6 1 3 0 5 9 姓 名： 高 优 年 级： 2 0 0 6 级 学 院： 环 植 学 院 系 别： 环 境 系 专 业： 环 境 科 学 指导教师： 唐 文 浩 （教授） 完成日期： 2010 年05月20日 摘 要 采用人工模拟降雨和径流场试验装置，对施入花岗岩砖红壤中氮素的迁移情况进行了研究，结果表明：在三种水平的施氮浓度下，降雨后砖红壤表层土（0～5cm） Abstract Uses the manual simulation rainfall and the diameter flow field test equipment,To executed into in the granite laterite the nitrogen migration situation to conduct the research. Result clear: Horizontal executes under the nitrogen concentration in three kinds, After the rainfall the laterite regolith (0～5cm) nitrogen density assumes the drop the tendency, indicated has had the soil nutrient outflow; Follow rainfall intensity change big, speed of eluviation for sediment turn big too. The rainstorm to the soil etching power is biggest，Its silt average outflow speed is time moderate rain 2.48 times, is time heavy rain 1.56 times; In runoff carryhome silt nitrogen content and silt quality present correlation; Mainly is by may dissolve condition the form along with the diameter running water migration nitrogen to carry on the migration, When different rain strong, the colloid shape nitrogen occupies the share is small, Along with rain strong enlargement, in the diameter running water the nitrogen density assumes the tendency which reduces gradually, This possibly is because the soil layer was known as certain adsorption to the soluble nitrogen to reduce the leaching out reason. Key Words： simulate rainfall; laterite ; nitrogen ; migrate characteristic 目 录 1 材料与方法…………………………………………………………4 1.1试验小区概况……………………………………………………4 1.2试验仪器和装置…………………………………………………5 1.3试验处理…………………………………………………………5 1.4样品采集和处理…………………………………………………5 1.5分析方法…………………………………………………………5 2 结果与分析…………………………………………………………6 2.1降雨前后表层土壤中氮素浓度的变化特征……………………6 2.2径流泥沙及养分流失特征…