青铜峡灌区土壤中三氮及盐分变化特征分析  

Variation feature of three kinds of nitrogen and salt in soils of Qingtongxia irrigation area

作　　者：陈伟伟[1] 李强坤[1] 孙娟[1] 胡亚伟[1] 

机构地区：[1]黄委会黄河水利科学研究院,郑州450003

出　　处：《干旱区资源与环境》2011年第9期102-105,共4页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(50879027);中央级公益性科研院所基本科研业务费专项资金(HKY-JBYW-2010-17)资助

摘　　要：以宁夏青铜峡灌区田间土壤中非点源污染物(总氮、硝氮、氨氮和盐分)作为研究对象,对土壤剖面进行分析。结果表明:表层土壤中各类污染物含量变化较大,基本上以60 cm深度为分界线,下层变化较小,而且作物生长期前后土壤中不同深度各类污染物含量变化与灌溉过程、施肥强度等关系密切;土壤中三氮含量变化幅度呈硝氮>氨氮>全氮的趋势,总氮在10月份的含量高于5月份,氨氮、硝氮在10月份的含量低于5月份。盐分在水田土壤中的含量变化幅度要高于旱田。Agricultural non-point source pollution is becoming the major cause of the environment deterioration.It has been researched in our country since 1980＇s,and now it becomes a research hotpot.An experiment was done to study non-point source pollutants from field soil in Qingtongxia irrigation area,Ningxia.Based on this experiment,we tried to find out TN,NO3^--N,NH＋4-N and salt content changes in soil profile.The result showed that：（1）The content of various pollutants in surface soil changed greatly,and changed less in deeper soil,which the boundary line is a depth of 60cm basically in soil.Besides,before and after the crop growth period,its content changes in different soil layers had a close relation with the process of irrigation,fertilization intensity and other factors.（2）The content change rate of three kinds of nitrogen was in the tendency of NO3^--〉NNH4^＋-N〉TN,and the content of TN in October was higher than that in May and the case of NH＋4-N and NO3^--N was just the opposite.The rate of salt in paddy field was higher than that in dry field.

关 键 词：灌区 田间土壤 三氮 盐分 变化特征 

分 类 号：X53[环境科学与工程—环境工程]