宁夏银南灌区湿地分析

宁夏银南灌区湿地季节性变化明显,受灌溉水的影响极大,随着节水灌溉等缓解水资源矛盾措施的实施,湿地已经出现萎缩,这必然加大农田排水中氮磷等化合物的含量.从湿地功能的角度出发,结合湿地的成因、概况、湿地与农田的关系,阐述湿地存在的必要性,并建议在目前水资源紧缺情况下给湿地留出一定的水量,为恢复湿地功能、发挥湿地效益提供前提,也为减少农业非点源污染、保护生态环境奠定基础.

Study on Wetland in Yinnan Irrigation District in Ningxia

The seasonal change of the wetland in Yinnan irrigation district is markedly.The wetland is also remarkably influenced by irrigation water.With the implementation of the measures mitigating the contradiction of water resources,such as water-waving irrigation,the wetland has started to shrink.This will increase the content of compound,such as the nitrogen and phosphorus,in farmland drainage.From the aspect of the wetland function,combining with the cause,general situation of wetland and its relation with farmland,the necessity of wetland is expounded.It is also proposed that under the present situation of lacking water resource,certain quantity water resources should be reserved for wetland to offer prerequisite for resuming wetland function and enlarging wetland benefit and to establish foundation for reducing agricultural non-point pollution and protecting environment.