摘要
以焉耆盆地开都河下游灌区为例,通过野外调查、采集水土样品,分析土壤剖面和地下水中氮素含量水平及空间分布特征。结果表明:研究区土壤氮素含量达到一级水平,属于高肥力区;浅层地下水水质在Ⅲ级以下,水质较差,均不满足生活饮用水标准要求。土壤及地下水中氮素含量空间变异属于中等变异,各采样点间氮素含量差异明显,主要受施肥时间和灌水条件影响。土壤剖面硝态氮表层积聚特征明显,存留在根系层的硝态氮含量较高,淋失不显著;铵态氮在土壤剖面主要表现为均匀分布和震荡分布,淋失量较大。该研究结果对预防地下水污染,维护农田生态系统平衡具有重要现实意义。
Using Yanqi Basin downstream of Kaidu River Irrigation District as an example, through field investigation, soil and water samples are collected, an analysis is made of soil profile and groundwater nitrogen levels and spatial distribution characteristics. The results show that the soil nitrogen content in the study area reaches the first level, which belongs to the high fertility area, and the shallow groundwater quality in three or less, poor water quality, not meeting drinking water standards. The spatial variation of ni- trogen content in soil and groundwater is medium variation, and the nitrogen content of each sampling point is significantly different, which is mainly influenced by the time of fertilization and irrigation conditions. Soil surface nitrate nitrogen accumulation significant- ly, retention in the root zone of nitrate nitrogen content is higher, there is no significant leaching. The leaching quantity is larger. The results of this study have important practical significance for preventing groundwater pollution and maintaining the balance of ag- ricultural ecosystem.
出处
《中国农村水利水电》
北大核心
2016年第10期26-30,共5页
China Rural Water and Hydropower
基金
国家自然科学基金资助项目(51369030)
水利部公益性行业科研专项经费项目
新疆维吾尔自治区水文学及水资源重点学科基金(xjswszyzdxk20101202)
关键词
硝态氮
铵态氮
土壤剖面
地下水
焉耆盆地
nitrate nitrogen
ammonium nitrogen
soil profile
groundwater
Yanqi Basin
