Study On Land Ecology Sustainability Based On ESV In Qiqihar City

The sustainable development of land use has become the inevitable trend and focus of modern society,especially in the state of imbalance of supply and demand of land resources.Taking the value of ecosystem services as the entry point of this paper,the research results can provide a reliable basis for the analysis and assessment of the ecological sustainability of land use.At the same time,the research on ecological sustainability can provide some guidance and reference for the improvement and restoration of ecological environment in the research area.This paper takes Qiqihar city as the research area,analyzes the land use type change in the study area from 1990 to 2015 through the data interpretation,makes use of the ecosystem service value research model,and modifies the ecosystem value coefficient of the study area.The change of ecosystem service value in Qiqihar city is analyzed from time and space,and the sustainable degree of each city is analyzed by constructing land use ecological sustainability index.This paper probes into the dynamic changes of the influencing factors of the ecological sustainability of land use in the study area during the study period,and puts forward the countermeasures and measures for the improvement of the degree of ecosystem sustainability in view of the realistic basis of the study area.The main conclusions are as follows:(1)From 1990 to 2015,the largest proportion of land use in Qiqihar City was cultivated land.The change trend of cultivated land was the most stable.The maximum change degree of water area decreased by 2043.45 km~2 in 25 years,the ecological environment function of the study area was damaged by the decrease of water area,the forest land area increased significantly.This has made a great contribution to the value of ecosystem services in the study area;the area of wetlands and grasslands has declined;construction land has steadily increased.However,the increase of unused land is large.(2)In terms of value coefficient,the value coefficient of food production function of per hectare farmland in Qiqihar is 792.91 yuan/hm~2.Based on the calculation of the net primary productivity of vegetation in the study area and the comparison with the whole country,the value coefficient is revised.The value coefficient of forest in the study area is 0.8.The value coefficient of industrial and mining construction land in the study area is-3.97 by calculating the discharge amount of"three wastes"and the cost of treatment,and bringing the aesthetic landscape function of industrial and mining construction land into the scope of calculation.(3)In terms of value variation,the total value of ecosystem services in Qiqihar city was reduced by 66.16×10~8 yuan in 25 years,which was mainly attributed to the loss of value caused by the reduction of water body and wetland area.Although the contribution of woodland to the total ecological value is gradually increasing,it is not enough to make up for the decreasing trend of value.(4)From a spatial point of view,the total value of Qiqihar presents a different distribution pattern of southwest high and northeast low.The research area was divided into several blocks with a grid of 0.2×0.2 km,and the ecological value was analyzed by autocorrelation analysis.The high value accumulation area of ecological value was mainly associated with rivers.The distribution of wetland and traffic trunk road has strong coincidence.(5)Based on the analysis of supply and demand structure,taking the total value of per capita food demand as demand and ecosystem service value as supply quantity,the index model of ecological sustainability of land use is constructed.The LES value of Qiqihar is 0.77,the supply exceeds the demand,and the sustainable state is higher,and the index values of 10 counties and cities are calculated separately.(6)In the aspect of sustainability evaluation,through selecting the input and output of cultivated land,there are 15 related indicators of social and economic development,and the time scale is divided into two stages,and the dynamic changes of indicators can be analyzed.(7)Puting forward some solutions to improve ecological sustainability of the study area,ecological restoration water area,the development of ecological agriculture,the protection of wetland resources,afforestation and conversion of farmland to forest and grassland,the development of new energy and 3s technology,The paper provides reasonable opinions and suggestions on different aspects such as district management and mitigation of carrying capacity of land resources.