设施条件下膜孔灌土壤水氮运移分布特性研究

Transport and Distribution Character of Soil Water and Nitric Nitrogen under Film Hole Irrigation with Facilities

在室内进行了模拟设施条件下膜孔灌灌施硝酸钾肥液试验,分析测定了灌后不同时间的土壤含水量和硝态氮质量分数。研究表明,土壤含水率和硝态氮质量分数随着灌后时间延长逐渐减小,土壤水分和硝态氮在灌后1d内存在明显减少现象,灌后5d土壤硝态氮反硝化作用加强;土壤含水率和硝态氮存在耦合现象,二者分布趋势基本相同,以膜孔中心为最大,远离膜孔中心逐渐减小。

In order to study the transport and distribution of soil water and nitrogen under film hole irrigation with facilities,the imitating experiment was conducted and the content of soil water and nitric nitrogen was determined.The result showed the content of soil water and nitric nitrogen decreased with time after irrigation,the redistribution was obvious on the first day after irrigation,the denitrification of nitric nitrogen was most;soil water coupled with soil nitric nitrogen because the distribution of soil water and nitric nitrogen was same to each other;the content of soil water and nitric nitrogen were most in the film hole and decreased with the distance away from film hole.