Effects Of Anthropogenic Activities On Wetland Landscape In Hongze Lake Rim

Wetland Rimmed Hongze Lake is an importance part of large fresh water lake cluster in our country eastern inland, extreme weak and mightiness of Anthropogenic Activities of Wetland eco-system is both exist. Under the function of strong market economy signal, Mankind'reformation, re-mold even destructive strength and scales are both increased, this actions lead to area and ecosystem functions of Wetland in Hongze Lake rim happened to degeneration even disappear at different degree, Wetland eco-system's integrity expensed continuously, ecosystem information loses continuously, it is importance to strengthen dynamic monitor and study the Wetland Rimmed Hongze Lake.This study mainly make use of the function of RS's dynamic monitor and GIS's space analysis to measure and express the gradient change of anthropogenic Activities and space distributes of Wetland during 1988~2006, composing function of anthropogenic Activities in Hongze Lake, discussing the Effects of anthropogenic activities on wetland landscape in Hongze Lake Rim from the angle of landscape eco-system at the same time, include space distributes, dynamic process and the degree of fit between time and space of Wetland. This study main discuss on changes of Wetland landscape connectivity, diversity, fragement, recognize the regulation and relation of this kind of changes, distinguish the evolve direction and strength in the future, the conclusion is as follows:(1)The area of Wetland Rimmed Hongze Lake is large and its type diverse, total area reaches to 2926.84 km~2 (2006), main Wetland type contain river, the lake, marsh, reservoir and pond. Among them, the area of lake landscape is the biggest, mainly include Hongze Lake, Gao You lake's the northwest, Baima lake's western, Tiangang lake's eastern, the area reach to 1351.32 km~2, take up 46.17% of the whole wetland area; the following is Marsh, river, reservoir, pond and artificial farm.(2) Wetland Rimmed Hongze Lake total present reduce first and increases behind in a mass during 1988~2006, 1998 is 2761 km~2, reduce to 2731.32 km~2 in 2000, 2006 is 2926.84 km~2, this mainly because is that artificial wetland is increment, especially the artificial river and reservoir, but lake and marsh trending descende.The Wetland Rimmed Hongze Lake is still trends further decrease in the future, only 2574.78 km~2 in 2015, and various wetland types are all descending.(3)The Wetland landscape diversity Index is about 1.3, landscape diversity leve locat on inferior Medium, but landscape diversity Index has the trend of gradual increment; Evenness Index approach to 1, Wetland distributing is tended to even distribute, although few big pattern's area(lake) is large so its distribution is adjective; preponderant Index present trend to descendent totally, indicate the wetland landscape proportion is out of tune, few pattern's areas are big, but the number is small; wetland landscape is break up in a mass, reflect anthropogenic activities's effection on wetland landscape is strengthen.(4) Along with the intension of anthropogenic activities reduce gradually in district, wetland area and average area of the pattern is increasing from 1 to 10, wetland density is increasing too, Meanwhile, the type of wetland, wetland diversity index and wetland connection index are also increase, but the wetland break up degree present the trend of descendent gradually.The different strength transect present better regulation.(5) Wetland that is rimmed Hongze Lake will take place more violent fluctuation In the future, the main fluctuation district locat in Chengzi lake which is in north of Hongze lake, from angle of all kinds Wetland, river's area is increasing small and not concentrated; The lake area descends district mainly is be located in the north of Hongze lake; The area of marsh and pool decend a lot and mainly concentrates in Dou lake in Xuyi county and shore northeastern Gaoyou lake's district in the town at the county of Xuyi;The concern wanted to strengthen the abrupt lake to the becoming of Si sun county son lake, and the county of Xuyi and Gaoyou lake etc. wetly keeps these regions from appearing wetly the degeneration trend of big area.(6)The southwestern of Sihong county (national wetland sanctuary), Xu yi inshore Huaihe river go into lake waterway, three and two river is important district to keep the wetland connection Hongze lake area, strengthen these the district wetland protect is important to maintenance Hongze lake rim's information exchanges, material commutation and energy of flow to turn and maintain district wetly eco-system stability and the ego maintenance ability.Based on the regulation and problem, make use of principle and method of landscape ecosystem programming to concentrated reconstruction and resumptive protection in the degeneration serious district, put forward to advise about spot piece and key action. This action will service Hongze lake of wetland ecosystem manage, also support information that macroscopic strategy for nation of wetland protect.