Study On The Relationship Between Land Use Change And Carbon Storage In Nanning

Human beings are affected by climate warming in many aspects of social production and life,and the most important effect is on human natural and social ecosystems.Nanning has obvious advantages in geographical location,pleasant environment and widely distributed forest areas.It is not only the provincial capital of Guangxi Zhuang Autonomous Region,but also the core of political,economic and cultural development in the Beibu Gulf region.The study area is rich in species,has a high level of forest coverage and urbanization rate.Therefore,the habitat quality of terrestrial ecosystem in Nanning has become the research hotspot of many scholars and the most concerned issue of the government.In nanning city in 2005,2010,2015,3 remote sensing image as the research basis,through the classification of interpretation for the study area land use status of three periods correspond to figure,and use the corresponding period yearbook data analysis of six different land types in the study area within the scope of temporal change and spatial pattern changes,using the transfer matrix in Arc GIS software to analyze function between classes differently to the change trend of integrated research during the period of nanning city land utilization in policy analysis to the change of the class.Finally,the carbon module of In VEST model was used to estimate the carbon storage of Nanning in 2005,2010 and 2015,supplemented by the trend of land use change to analyze the relationship between the two.The main conclusions of this paper are as follows:1.The land cover of Nanning has changed significantly in the past ten years.Through the construction of land area change chart to analyze the trend of increase and decrease,the establishment of land transfer and transfer table to analyze the spatiotemporal changes of six land types.From the perspective of time,the most obvious change was that the urban construction land continued to increase outward radiation,the fluctuation of forest land decreased,and the land area of grassland,wetland and arable land showed a continuous decrease trend.From the perspective of spatial change,the increase of construction land was mainly distributed in the south of the central part of the study area,and spread along the river in a stripe pattern.The decrease area of cultivated land,woodland,grassland and wetland was widely distributed in the study area.2.Obtain the current land use map of Nanning in Phase III and the carbon density data of the three major carbon pools corresponding to the six land types,and obtain the carbon storage data of the study area with the help of In VEST platform.The study showed that the total carbon storage of the ecosystem decreased by 0.0059 Tg from 2005 to 2015,showing a certain degree of carbon release,and the carbon sequestration capacity showed a continuous trend of decline.The central part of the study area has the most carbon sources.3.The change direction of carbon storage value in different land types is identical with the change direction of increase and decrease of area and transfer of land types.In the process of urbanization of Nanning,the carbon storage in the study area is mainly manifested as the highest value of forest land,the second level of cultivated land,and the lowest value of carbon storage of construction land.The land-appropriation behavior in the process of urbanization has limited the overall development trend of terrestrial ecosystem carbon storage in the study area.4.The relationship between land use change and terrestrial ecosystem carbon storage.On the basis of the study,it is suggested to use the production and life style of energy conservation,emission reduction and emission reduction,and increase the overall carbon fixation in the study area by improving the intensity of land use.Finally,scientific reference suggestions are put forward for the future land consolidation plan of Nanning City and the improvement of habitat quality.