Function Regionalization Of Water Ecosystem For The Liaohe Drainage Area On Arcgis

Function regionalization of water ecosystem for the Liaohe drainage areaexecutes geographical space partitions according on landscape pattern changes and itsdriving mechanism of the wetland, eco-environmental sensitivity and the importanceof water ecosystem service functions. The aim is clear that the basin-wideeco-environmental problems and eco-environmental vulnerable area, the areas whichare important to the watershed ecological security and need to be strengthened. Thepurpose is to provide a scientific basis for the industrial layout of the basin, ecologicalenvironmental protection and planning. Functional zoning of the aquatic ecosystem isa prerequisite and basis for the implementation of regional management of theregional eco-environment and is an important foundation for basis for harmonioussustainable development of coordinating river basin.This paper adopts the method of combining qualitative and quantitative partitions,using computer graphics space overlay method, correlation analysis, expertintegration and other methods, partitioning demarcation through a bottom-up divisionaccording to the hierarchy of ecological function zoning. Bottom-up classificationmethod is to put the similar small watershed of aquatic ecosystem function intopartition unit. According to environmental factors and the heterogeneity of aquaticecosystems, select the classification of indicators which are based on ecosystemstructure. According to various indicators of aquatic ecosystem function, exclude theduplication of some amount of information and the larger related index. After theoriginal data is standardized, extract and calculate the value of the index of indicatorswhich are supported by GIS. Finally, division results are obtained by cluster analysis.The mainly result of research is as follows:(1) The changes of wetland types of the Liaohe drainage area mainly reflected in alarge number of natural wetland into artificial wetland or artificial landscape, whichspecifically reflected in building land, rice fields and aquaculture area. Between1988and1995, the quality of the environment declined in Liaohe. The biological diversityof the living environment in this area reduced, which caused a reduction of populations of some species even disappeared. But since1995, landscape diversityand evenness increased, anti-jamming capability enhanced and the environmentalquality improved. In a word, the impacts of human activity combining with naturalconditions are the leading factors that induce dynamic change of the landscapepattern.(2) The spatial distribution of ecological sensitivity of Liaohe area wassignificantly differently; The moderately sensitive zone was mainly located inPanshan district and southeastern parts of the Gaizhou district, where grew a largetracts of land, parts of the saline reed and mountain forest with better ecologicalenvironment; The high sensitive zone took up most of the total study area and coveredthe city of Panjin, Yingkou, Dashiqiao, Dawa district and the most area of Gaizhou,where the majority of land-use type was culture zone, rice fields and building land,which were especially vulnerable.(3) the importance of aquatic ecosystem function was high in the entire studyarea; the spatial distribution of Liaohe area was significantly differently; high andhigher region accounted for44.9%.(4) GIS technology was used to research the ecological function regionalizationfor Liaohe drainage area. The result was that Liaohe drainage area was divided intofour important ecological function ereas and a class of low function area. Defined theimportant ecological function ereas and explored the corresponding managementmeasures. It had great significance to maintain the stability of ecological function forthe Liaohe drainage area.