为研究耕地退耕后对挠力河自然保护区的水环境质量，分别于2019年7月和10月，在保护区自然湿地与退耕湿地内共选取12个采样点进行理化监测。利用地表水环境质量监测标准(总氮和总磷)和综合营养状态指数，对挠力河自然保护区的水质进行评价，研究结果表明，挠力河保护区水质处于III-V类，自然湿地水体质量高于退耕湿地，主要污染物为 、TN与TP；保护区自然湿地内水质呈现一定程度的中度营养状态，退耕湿地水质由于受农田退水的影响，水质呈现富营养和轻度富营养状态，因此退耕湿地富营养化程度明显高于自然湿地。
In order to study the water environment quality of Naolihe Nature Reserve after returning farm-land, 12 sampling sites were selected in the natural wetland and returning farmland wetland of the reserve for physical and chemical monitoring in July and October of 2019 respectively. The water quality of Naolihe Nature Reserve was evaluated by using the surface water environmental quality monitoring standard and comprehensive nutritional status index. The results showed that the water quality of Naolihe Nature Reserve was grade III-V level, the water quality of natural wetland was better than that of returning farmland wetland, and the main pollutants were？ , TN and TP; The water quality in the reserve was mesotropher. Due to the impact of farmland return water, the returning farmland wet land is rich in nutrients, so the eutrophication degree of the returned farmland wetland was significantly higher than that of the natural wetland.
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