旱地控制排水条件下氮素运移试验研究  

Experimental Research on Nitrogen Transport and Transformation of Controlled Drainage on Dry Lands

作　　者：瞿思尧[1] 黄介生[1] 杨琳[1] 李大文[1] 王修贵[1] 

机构地区：[1]水资源与水电工程科学国家重点实验室武汉大学,湖北武汉430072

出　　处：《中国农村水利水电》2009年第1期48-51,共4页China Rural Water and Hydropower

基　　金：国家"十一五"科技支撑计划课题"灌区农田排水与再利用关键技术研究"资助(2006BAD11B06)

摘　　要：为探讨在旱地采取控制排水措施、控制不同深度时土壤中氮元素的迁移转化规律,在旱地进行了控制排水试验,对土壤的硝态氮及铵态氮进行了追踪测定。试验表明,不同控制深度时,土壤剖面硝态氮质量分数在80 cm深度以内随着深度的增大而增大,且在80 cm深处时已趋近于0,而土壤剖面铵态氮浓度并没有随着深度增大而呈现一定的趋势;控制排水水位高,对应田块中土壤剖面各层硝态氮及铵态氮质量分数均较高,控制排水在旱地能起到保肥及减少施肥的作用。An experiment concentrating on concentration determination of nitrate nitrogen and ammonium nitrogen is carried out in experimental plot. The experiment is intended to analyze transportation as well as its law of nitrogen in the dry-land soil where con- trolled drainage measurement is condueted. The results show that, the concentration of soil nitrate nitrogen is becoming less and less from the surface to the depth of 80cm under the ground, and tends to be 0 at 80cm. However, the concentration of ammonium nitrogen isn＇t restricted by such a law： if the height of the drainage pipes is controlled, then both the concentration of nitrate and ammonium nitrogen in the experimental dry land is higher. Besides, controlled drainage can be used to save fertilizer and help utilize fertilizer effectively.

关 键 词：旱地 控制排水 保肥 控制深度 

分 类 号：TV93[水利工程—水利水电工程]