河套地区湿地植被特征及水体净化潜力

农田退水中N、P含量的超标对黄河造成的污染已经日益严重。利用植被处理污水已成为当今社会的热点。本研究在调查河套地区湿地植物资源的基础上,探讨湿地植被生产力和多样性与水质净化功能的关系。结果显示：（1）河套地区湿地植被的物种比较单调,但优势物种的初级生产能力很高;（2）湿地优势群落芦苇的再生性很低,不适合于多次收割利用;（3）春季焚烧处理可以清除植被残茬,促进芦苇的生长和营养物质积累,是一种值得推广的管理方式;（4）通过对湿地植被的合理利用每年可以带走113.46kg/hm2的N和17.08kg/hm2的P,大大减轻河套灌区的污染负荷。

Characteristics of The Wetland Vegetations and Potential Capacity of Water Body Purification in Hetao Area

The N,P content in subsiding water from cropland exceeding the standard level has polluted the Yellow River more seriously.The sewage treatment utilizing vegetation has become a hot issue in modern society.In the paper the relationship between the productivity of wetland vegetation、the vegetation diversity and the function of Water body purification was studied based on the investigation of the wetland plant resources in Hetao area.The results show：（1）the wetland vegetation species in Hetao area are rather monotonous,but the primary productivity of the dominant species were very high;（2） the reproducibility of Phragmites communis in wetland dominant communities are so low that it is unfit for harvesting utilization many times;（3） Incinerating treatment in spring is a management method worthy of popularizing which can clear away vegetation stubble,and can hasten the growth of Phragmites communis and nutrients accumulation;（4） utilizing the wetland vegetation reasonably,it can absorb 113.46kg / hm2 of N and 17.08kg / hm2 of P per year,so that it can reduce the pollution loading of Hetao Irrigation area greatly.