中文摘要：

文章采用灰色聚类法评价石佛寺人工湿地2009-2012年间4年间的进出口处水质级别。选取溶解氧、高锰酸盐指数、化学需氧量、五日生化需氧量、氨氮、总磷、总氮作为评价指标,以国家规定的《地表水环境质量标准》（GB3838-2002）为评价标准将水质分为5个等级,水质评价级别的确定采用级别特征值,可较为精确的反映水质状况。评价结果表明：汛期湿地对水体的净化作用明显,因为汛期水生植物生长旺盛,微生物活跃,水体自净能力强。2012年湿地净化作用不明显,可能是水生植物腐解导致的,应加强此方面的研究。

英文摘要：

In this paper,the import and export water environment quality of Shifosi constructed wetland in the four years（2009-2012）is evaluated based on the Grey Clustering Method.Six indexes,namely DO,CODMn,BOD5,NH3-N,TN and TP,are selected as clustering indicators.＂Surface Water Environment Quality Standard＂（GB3838-2002）are used as the water quality evaluation standard to divide five grades for the evaluation,and the level eigenvalue is adopted to determine the water quality level to obtain higher credibility.The results show that the wetland water purification effect is obvious in flood season because that the aquatic plants grow vigorously,the microorganisms grow active in flood season,and thus the water has strong self-purification capacity.The wetland purification effect is not obvious in 2012.This may be the result of decomposing of aquatic plants.So the research on decomposing of aquatic plants should be strengthened.