桂林市堰塘湿地农田水环境修复技术研究

Application of Guilin City's Pond-wetland in Drainage Treatment in Agricultural Water Environment

从农田灌溉与水环境保护角度,论述了桂林市农田水环境现状并分析其面源污染的成因,提出利用南方堰塘湿地对农田水环境进行保护和修复是一项有效的技术措施。观测结果表明,南方水稻田废弃堰塘改造后的半人工湿地对农田排水中氮、磷元素的去除效率很高,分别达到了53.8%和61.1%,在水稻抽穗开花期湿地的去除效率最好,在返青和黄熟期湿地的去除效率最差。

This paper,on the view of agricultural irrigation and water environment protection,has explored and analyzed the current situation of agricultural water environment and the mechanism of non-point pollution in Guilin City,and also put forward pond-wetland technology with great efficiency to protect and restore agricultural water environment in South China.According to the observed data in Central Irrigation Experimental Station of Guangxi Zhuang Autonomous Region,the removal rates of nitrogen and phosphorus separately attain to 53.8% and 61.1% in the pond-wetland,also named semi artificial wetland,which is remade by the deserted pond in paddy filed.Through the research in different growth periods of rice,it is proved that the maximum removal rate of pond-wetland occurs in heading and flowering growth period,while the minimum removal rate occurs in turning green and yellow ripe period.