“堑秋湖”对鄱阳湖湿地越冬候鸟栖息功能的积极作用评价

The Positive Evaluation of “Lake Enclosed in Autumn” on the Habitat of Winter Bird in Poyang Lake Wetlands

"堑秋湖"是鄱阳湖区广泛存在的一种传统捕鱼作业方式,由于其不合理的捕捞方式,近年来受到广泛诟病;然而,在秋冬季退水后,鄱阳湖湿地显露滩地上大量子湖泊,在"堑秋湖"之后,形成大量软泥和浅水区,这些区域有利于越冬候鸟觅食栖息。根据鄱阳湖湿地景观分类和湖底高程等数据,结合秋冬季遥感影像,对"堑秋湖"在枯水期所提供越冬候鸟栖息功能展开研究。结果表明:1)"堑秋湖"使鄱阳湖在枯水期平均提供667.5 km^2的候鸟栖息面积,最多能提供925.9 km^2;2)枯水期,"堑秋湖"水位高于同期鄱阳湖星子水位,使之维持了更多小区域湿地,对越冬候鸟栖息地发挥积极功能。

“Lake Enclosed in Autumn”is one of the fishing methods that the fisherman catch all the fish living in the sub-lake when the lake level is low.In recent years it has been criticized because of irrational fishing methods.But,during the dry season,the Poyang Lake wetlands revealed a large number of sub-lakes,which can do some favor for the winter birds.According to Poyang Lake wetland landscape classification,terrain data and the remote sensing images of dry season,study the function of“Lake Enclosed in Autumn”to provide wintering habitat for migratory birds.The result show:1)“Lake Enclosed in Autumn”can provid habitat for migratory birds area 667.5 km 2 during the dry season,which supports up to 925.9 km 2 area;2)The level of“Lake Enclosed in Autumn”is higher than Poyang Lake Xingzi water level,so it can keep more small area of wetlands,which play an active function for wintering migratory birds during the dry season.