| Wetland has many functions and benefits,such as flood storage and waterlogging prevention biodiversity protection and so on,with the development of social economy,wetland protection is facing many problems.In order to understand the current situation and the problems of Huoqiu County wetland,providing scientific basis for the future wetland protection planning of Huoqiu County,this paper takes the remote sensing image of Huoqiu County in 2017 high water period as the data source,and refers to the second-level data of Huoqiu County wetland resources(year 2013),with the support of GIS,wetland patch zoning and verification of constructed wetland,lake wetland,marsh wetland above 2hm2(including 2hm2)and river wetland whose width is more than 10m and length 5km are carried out,and wetland spatial database is established.Eight plaque characteristic indices were selected to study the characteristics of wetland plaques in Huoqiu County.The results are as follows:(1)Huoqiu County has 440 artificial wetlands,lakes and swarrps with a wetland area of nore than 2hm2(including 2hm2)and river wetland patches with a width of more than 10m and a length of more than 5km,with a total area of 41384.08 hm2.Among them,there are 13 lake wetland patches with a total area of 20112.86 hm2,which is the dominant wetland type in Huoqiu County and mainly distributed in the northeast of Huoqiu County.A total of 28 river wetland patches,with a total area of 14229.12 hm2,are mainly distributed in the southern part of Huoqiu County and a small part in the northwest.The total area of swalr and wetland patches is 534.28 hm2,and it is mainly distributed near east lake and west lake.The total number of artificial wetland patches was 383,with a total area of 6507.83 hm2.The patches were widely distributed,most of which were small ones with severe plaque fragmentation.The number of patches in the river wetland and lake wetland in the area of more than 12 hm2 is the most,and the wetland is relatively complete.(2)When the wetland patch connectivity is the best,the?index is 1,and the current wetland of Huoqiu County only has ayindex of 0.059,with poor patch connectivity.The main factors influencing the Huoqiu County wetland patches connectivity are constructed wetland,when reduce the numbers of artificial wetland libraries in the pond and aquaculture farms,and increase the number of canals and water river,which have a promoting effect on the connectixe of wetland patches,and when the pond aquaculture farms and library number is 0,the wetland yindex was 0.815,close to 1,the wetland is akin to the biggest plane network,the connectivity of wetland patches is best and at this point is more advantageous for the flow of water,purification of water quality,fish breeding,etc.(3)The patch fractal dimension and the patch shape index of the river wetland are the highest,which indicates that the patch shape and the patch circumference of the river wetland are complex,irregular and less disturbed by human,which is more conducive to the protection of wetland biodiversity.Affected by reservoirs and aquaculture farms,constructed wetlands have the highest patch fragmentation index and the lowest average patch area index,with severe patch fragmentation and poor connectivity between patches,which is not conducive to water flow,water quality purification and fish reproduction.The patch fragmentation index of lakes and wetlands is the lowest,the average of patch area index is the largest,and the patch is relatively complete,which is more conducive to flood storage and waterlogging prevention,water purification,fish reproduction and so on.(4)The northwest part of Huoqiu County Wetland is a plain river wet area,the northeast is a plain lake wet area,and the south is a hilly land river and Kutang wet area. |
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