Study On Coupling Coordination Relationship And Dynamic Simulation Of Water-Land Resources And Environment In Southeast Yunnan

Southeast Yunnan is located in the Southeast part of Yunnan Province, which is a typical karst mountains. A large area of the district carbonate rocks exposed in the region, under the unique role of geochemical processes, Karst landform is widely development. Since karst soil forming process is slow, soil is barren and the distribution is not continuous, and it is affected by karst geological structure of the binary, water retention capacity is low, rocky is widespread. In addition, variation coupled karst ecosystem is highly sensitive, disaster capacity is low, environmental capacity is small, and therefore ecological environment is extremely fragile. But Southeast region is an important traditional agricultural areas of Yunnan Province, land area accounted for only6%of the dam on two-thirds of the population and a third of the land, but only5%of water resources, the long-term unreasonable use of water-land resources development, making the vegetation cover on karst area were severely damaged, rapid erosion made the underlying bedrock surface was directly exposed, rocky spread rapidly. Contradiction between water-land resources and ecological environment have become increasingly prominent. Therefore, to carry out study on coupling coordination relationship and dynamic simulation of water-land resources and environment in Southeastern Yunnan, to clarify the coupling mechanism associated with each element of the regional within the system between water-land resources and ecological environment, to optimize the allocation of water-land resources to explore ways for solving karst mountains and the sustainable use of water-land resources conflicts, resources, economic, and environmental development is particularly important to protect regional ecological environmental protection.In this paper, natural resource endowments and ecological environment of Southeast Yunnan karst mountainous district were examined deeply, based on3S technology, using multi-period and multi-platform remote sensing data, the regional distribution of rocky desertification situation, characteristics, spatial patterns and regional differentiation rule were investigated and analyzed. Using of temporal GIS and gray correlation method, features and problems of water-land resources development and utilization and ecological vulnerability were evaluated and analyzed, and thus associated response mechanis with water-land resources and environment were quantitative and qualitative analyzed; based on entropy right method and coupling coordination theory, system for, coupling coordination evaluation of regional water, land and ecosystem was done; applying theories and methods of system dynamics, water-land resources complex system configurations SD simulation model was built which based on water-land resources,economic and environmental optimization systems, combining with the extensive water-land resources endowment, using computer software Vensim, optimal allocation of water-land resources empirical model were simulation studied, policies for sustainable use of water-land resources and environment were presented in Southeast Yunnan karst mountainous. The results shows that:(1) Research on remote sensing investigation and driving forces of rocky desertification. Southeast Yunnan karst mountainous area is the most serious concentrated distribution of rocky desertification area in Yunnan province. Regional desertification types is given priority to with mild rocky desertification and moderate rocky desertification. From1992to2012, rocky variation tendency showed an increasing trend in general, and the intensity increased faster, ecological environment continues to deteriorate. Rocky area is definitely not a factor in the evolution of the role of individual results, but the results of multiple factors working together. Karst rocky desertification is not equivalent to the worst ecological fragile areas and areas of ecological environment quality, characterized primarily by the rate of change of ecological environment, the ability of ecosystems to resist interference from outside (including disaster) and the stability and sensitive ecosystems nature to reflect.(2) Research on spatial and temporal matching patterns. The most prominent characteristic of water-land resources is lack of water-land in Southeast Yunnan Karst Mountain. Special environment evolution background makes the degree of water-land resources shortage and the matching of time and space. Regional water resources with groundwater is given priority, and difficult to develop and utilize. Scattered distribution of land resources, soil thin, easy to loss. Easy to cause a series of ecological environment problems. Regional overall matching degree of water-land resources, due to various counties (cities, districts) resources endowment is different, various types of landforms, difference obvious, unbalanced distribution of water-land resources spacetime, determines the matching degree of water-land resources space differences, water-land resources matching showed strong regional differences.(3) Research on vulnerability assessment of the ecological environment. Regional ecological environment centralized interface variation reflects environmental sensitivity high and low environmental capacity, disaster bearing capacity is weak, poor stability characteristics of a series of vulnerabilities. Karst southeastern Yunnan30counties (cities, districts) of the ecological environment vulnerability assessment results indicate that there are four extremely vulnerable counties, four counties severe vulnerability, eight moderately vulnerable counties, seven mild vulnerable counties were two small, the middle of the situation. Ecological vulnerability of karst areas in Southeast Yunnan reflects the combined effects of karst areas of special natural factors and human activities. According to the actual circumstance of southeast yunnan karst mountainous area, introduced the main mechanism of ecological environment vulnerability in karst mountain area including mountain system vulnerability, karst geological chemical vulnerability and vulnerability of humanities, multiple mechanisms of restriction is the essence of southeast yunnan karst mountainous area ecological environment system vulnerability.(4) Research on water-land resources utilization and ecological environment associated with the coupling coordinate research. There is a coupling relationship of mutual restraint between water-land resources utilization and ecological environment interaction, which is a measure of the degree of coupling an important basis for coordination of water-land resources utilization and ecological environment for sustainable development.2003-2012, the coupling area of water-land resources utilization and ecological environment stable, were all above0.9, while the more obvious changes in the coupling coordination degree are intermediate coupling from2003to2005, the coupling coordination degree are well coupled from2005to2008, the coupling coordination degree are a quality coupling from2008to2012. From the evaluation results, form2003to2012, the area of water-land resources utilization and coupling coordination degree rise has been in a state of ecological environment, and always belong to both synchronous type, which indicates that the coupling of water-land resources utilization and ecological environment favorable trends in land development and utilization of resources in the process, pay more attention to protecting the environment.(5) Research on system dynamics simulation sustainable utilization of water-land resources.Through system analysis, build the causality diagram, system flow chart, design system parameters and calculating structural equation, build a system dynamics model for sustainable utilization of water-land resources.The model contains133active equations,8state equations,20flow rate equations and table functions,12other equations, including93auxiliary variables and exogenous variables.System dynamics model for debugging and testing on the numerical results show that the model has the sensitivity. The structure of the model is stable.From solve guangnan county were water-land resources supply and demand balance problem, the design scheme of water-land resources sustainable utilization, and dynamic simulation and evaluation results show that the coordination scheme is guangnan county were the optimal scheme of sustainable utilization of water-land resources, to realize high utilization has guiding significance to the regional soil and water resources.