| In recent years,with land use changes and increasingly frequent development,human activities have affected ecosystems in various ways.Ecosystem services are the source and basis for human survival and development,and are irreplaceable by science and technology.It has been recognized that ecological well-being is closely linked to the functioning of ecosystems.In order to enable sustainable development and long-term harmonious coexistence between human and nature,ecosystem service capacity needs to be enhanced,however,it is unrealistic to increase the value of ecosystem services over such a large area at the same time.The cost of ecological construction,the cost of improving ecological functions,and the cost of socio-economic development all require that a certain range of areas be selected as priority areas for increasing the value of ecosystem services.Identifying priority areas is an important basis for scientific and orderly ecological protection.Identifying the areas that need priority enhancement,scholars at home and abroad have carried out different aspects of research such as simulation of land use dynamics and construction of regional landscape ecological security pattern.At present,the screening indexes of ecological priority areas at home and abroad are different and inconsistent,so much so that they contradict and duplicate each other.And if the equivalence factor method of Xie Gaodi is completely followed in calculating the value of ecosystem services,in which there is only one reference value for biodiversity and no remote sensing estimation of plant diversity.The southern hilly mountains are important ecological barrier areas and ecological function areas in China,and it is important to identify and enhance the ecosystem service values of the barrier zones in the southern hilly mountains.In this study,Danjiangkou,Cili,Huaying,Chongyi and Lechang,which are located in the southern hilly mountains,were used as the study area,and the secondary classification data of land use,precipitation data,net first productivity data and soil regulating factors were used to correct the equivalence factor table,and the coefficient of variation of the study area was calculated by remote sensing data,so as to estimate the plant diversity of the study area instead of the equivalence factor table The biodiversity values in the equivalence factor table were replaced by the coefficient of variation calculated from remote sensing data.Combined with ecological sensitivity analysis and ecological importance evaluation,overlay analysis was performed to identify preliminary priority areas for ecosystem service enhancement.And through the hotspot analysis of plant diversity,the hotspot areas and the priority areas identified in the previous step are overlaid and analyzed to arrive at the final priority areas for ecosystem service enhancement,and then the ecological corridors of the five study counties are constructed using the minimum cumulative resistance model,and suggestions for enhancing ecosystem services are made accordingly.In this paper,we identified the preliminary ecosystem service enhancement priority areas by overlaying the rate of change of ecosystem service values,the importance of service functions and ecological sensitivity.Among the preliminary ecosystem service enhancement priority areas,the proportion of forest land in the first and second priority areas of Chongyi exceeded more than half of the total area of that level,and the proportion of forest land in the first enhancement priority area of Cili was 38.18%,and the proportion of forest land,shrubs and sparse forest land in the second priority area were 37.55%,34.63%and 11.04%respectively.The proportion of forested land in the first priority area of Danjiangkou was as high as 50.51%,and the proportion of sparse forested land in the second priority area was the highest at 43.90%.In Lechang,89.31%of the first priority zone was woodland,63.16%of the first priority zone in Huay ing was woodland,and 91.84%of the second priority zone was woodland.And after combining the plant diversity hotspot analysis,we got that the two parts of priority areas in polish are 1362.01 ha and 1522.70 ha,the largest priority area in chongyi is 853.97 ha and the smallest is 91.44 ha,the largest of 9 priority areas in lechang is 4270.41 ha and the smallest is 158.47 ha,the largest of 8 priority areas in cili is The final identified priority areas for ecosystem service enhancement are all well connected through the establishment of ecological corridors.This study uses a combination of remote sensing,GIS,and spatial statistics,which can overcome the problems associated with identifying priority areas in previous studies to determine priority areas for ecosystem service enhancement.This study collected remote sensing information of plant diversity,integrated into the evaluation of ecosystem service function value,and identified ecological priority areas in each region through ecological sensitivity analysis,ecological service importance analysis,ecosystem service change,plant diversity hotspot analysis,and corridor screening.The land use types of the priority areas are mainly forest land.Based on the above study,and the southern hilly mountains are important ecological function areas in China,we should enhance the ecosystem service function through ecological restoration,industrial structure adjustment,land use optimization,and agroforestry ecosystem transformation,build and protect forest corridors and river corridors,and strengthen the material flow and energy cycle among ecological source sites.This study explores the method of ecosystem service value assessment based on remote sensing estimation of plant diversity,identification of plant diversity hotspots and corridor design,and the method of identifying priority areas for ecosystem service enhancement by combining the rate of change of ecosystem services,ecological sensitivity,and the importance of ecosystem service functions,which is innovative in terms of methodology and provides theoretical suggestions for local ecological protection. |
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