Study On The Correlation Between The Landscape Pattern Of Dongting Lake Area And The Change Of Land Ecosystem Service Value

Ecosystem services are the natural environmental conditions on which human beings depend for survival and development.Humans obtain value and benefits that support their own development through the ecosystem.However,with the rapid increase of population,the acceleration of industrialization and urbanization,the ecological and environmental problems caused by changes in landscape patterns have become increasingly prominent.Since the reform and opening up,China has made great achievements in social and economic development,but at the same time it faces the grim situation of tight resource constraints,serious environmental pollution and degraded ecosystems.This has become the key to curbing sustainable development in China.The harmonious coexistence between mankind and natural ecological environment is the premise and guarantee for the sustainable development of human society.To realize ecological environmental protection and economic and social development,we must deal with the relationship between man and nature.Therefore,by studying the correlation between the landscape pattern and the changes in the value of land ecosystem services,it is expected to provide a theoretical basis for the optimal allocation of land resources,sustainable socio-economicdevelopment and ecosystem protection,and provide scientific and rational decision makers.Decision basis.This paper takes the landscape pattern as the entry point,analyzes the landscape pattern of the study area by the landscape index method,and estimates the land ecosystem service value of the study area based on the equivalent factor method.Correlation analysis,grey correlation analysis and sensitivity analysis are used.The correlation between the two is quantitatively analyzed.At the same time,the driving mechanism of the landscape ecosystem to the value of land ecosystem services is analyzed,and the landscape pattern optimization strategy based on the value of land ecosystem services is proposed.The main research contents and conclusions of this paper are as follows:(1)Taking the five remote sensing images of 1995,2000,2005,2010 and 2015 as the data source,the dynamic changes of the landscape pattern of the study area were quantified from the quantitative structure of land use type and the spatial arrangement of landscape pattern.the study.The land use dynamics,land use transfer matrix and other methods were used to analyze the structural changes of land use types.The landscape index method was used to select the landscape level index to analyze the landscape pattern changes in the study area.The results show that cultivated land and woodland are the dominant landscape types in the study area.From the whole research period,the forest,wetland,construction land and unused land in the study area generally show an increasing trend,while cultivated land,grassland and waters have Different degrees of reduction.From the perspective of land use type transfer matrix,the mutual transformation between cultivated land,forest land and waterland construction land is more frequent.From the perspective of landscape level,with the acceleration of urbanization process,the fragmentation and separation of landscape patterns increase,the landscape shape is complicated,the landscape heterogeneity is enhanced,and the dominance of dominant patches is declining.(2)Estimate the total value of land ecosystem services and individual values ??in the study areas in 1995,2000,2005,2010 and2015 based on the equivalent factor method.The research shows that during the whole research period,the total value of land ecosystem services in the study area decreased first,then increased and then decreased.The total total value decreased by 1.455 billion yuan,and the value of water ecosystem services decreased.The main reasons for this;climate regulation,water conservation,soil formation and protection,waste treatment and biodiversity conservation are the most important ecosystem services in the Dongting Lake area;the high value areas of ecosystem service value in the study area are mainly concentrated in the Dongting Lake area.And its surrounding wetlands,while the low-valueareas are mainly concentrated in areas with high levels of urbanization and concentrated construction land.(3)Correlation analysis,grey correlation analysis and sensitivity analysis were used to analyze the correlation between landscape index and land ecosystem service value change.The results show that there is no simple linear relationship between landscape index and land ecosystem service value,and there is a certain synergy.The gray correlation index indicates the heterogeneity of the landscape,the degree of agglomeration between the patches and the degree of fragmentation.To a certain extent,it affects the change of land ecosystem service value in the study area.The sensitivity index indicates that the degree of agglomeration between landscapes and the extension to a certain direction have a greater effect on the ecosystem service value of the study area.(4)Based on the analysis of the landscape structure change for the driving mechanism of land ecosystem service value,this paper proposes the optimization strategy of land landscape pattern with the purpose of improving the value of ecosystem services,including these aspects:optimizing land use structure and improving land resources.Use efficiency;save intensive use of construction land;strengthen the construction of ecological sources and ecological corridors;accelerate the informatization and scientific management of land resources.