膜孔直径对微咸水膜孔灌土壤水盐氮运移分布影响  

Impact of Pore Size on Transport and Distribution of Water,Salt and Nitrogen under Brackish-Water Film-hole Irrigation

作　　者：林晓康[1] 胡浩云[1] 侯毅凯[1] 程东娟[1] 刘辉[2] 谢利云 

机构地区：[1]河北工程大学水电学院,河北邯郸056021 [2]华北水利水电大学水利学院,郑州450011

出　　处：《节水灌溉》2014年第11期21-24,共4页Water Saving Irrigation

基　　金：河北省科学技术研究与发展项目(14227002D);国家自然科学基金(51279157)

摘　　要：通过室内不同膜孔直径膜孔灌单点源微咸水入渗试验,分析了相同灌水时间下膜孔直径对微咸水膜孔灌土壤水、盐、硝态氮运移分布影响,结果表明:膜孔直径越大,相同入渗时间的累积入渗量越大;相同入渗时间,湿润锋运移距离随膜孔直径的增大而增大;灌水结束时,膜孔直径越小,相同位置的土壤含水量越小;土壤硝态氮含量随着距离膜孔中心距离增大而减小,随着膜孔直径的增大而增大,而土壤含盐量则相反。以上研究结果可以为合理利用微咸水进行膜孔灌灌溉提供理论依据。Through indoor infiltration experiments of brackish-water film-hole irrigation of single point with different pore sizes ,the impact of pore size of brackish-water film-hole irrigation on the transport and distribution of water ,salt and nitrate nitrogen in the same irrigation time is analyzed .The results show that ：the bigger the pore size is ,the greater the cumulative infiltration is during the same infiltration time and the wetting front transport distance increases along with the increase of pore size ;at the end of irriga‐tion ,the smaller the pore size is ,the less the soil water content is in the same position ;the soil nitrate nitrogen content decreases with the increase of distance from the pore center ,and increases with the increase of pore size ,while the soil salt content is opposite . This research can provide a theoretical basis for the rational use of brackish-water film-hole irrigation .

关 键 词：膜孔直径 膜孔灌 微咸水 水盐氮运移分布 

分 类 号：S275.3[农业科学—农业水土工程]