Study On Land Use Change And Its Effects On Eco-environment Of Xijiang River Basin In Guangxi

Land is the most basic natural resources and is the material basis for the survival and development of human society,also is the place for human production and life and an essential material basis for social development.In the “population-resources-environmen-development” system,land resource is in the basic position.Land use reflects the most direct and close relationship between human beings and nature.The development of the economy in the use of land,but also a huge impact on the structure of natural resources.Guangxi Xijiang river basin is located in the subtropical humid monsoon climate region of our country,it brings together Guangxi Nanpanjiang,red river,Qianjiang,Xunjiang,Yujiang,Liujiang,Guijiang and Hejiang flow in Xijiang River.Through the Pearl River Delta,and flow into sea from Hongkong area.At the same time,it's an important gateway in the Yungui Plateau to the Southeast Coastal Hil y transitional zone and southwest underdeveloped areas to developed areas in transition zone.Guangxi Xijiang River Basin has a special geographical and economic location.With the western development strategy and the "Guangxi West River Economic Zone Development Planning" planning implementation of the Xijiang River in Guangxi economic area up to a certain height,the rapid development of regional economy,to a certain extent the changes of land use pattern,the regional ecological function feedback effect.Based on the above research background and land use remote sensing monitoring data as the basis,with reference to the relevant theoretical basis,follow the "geography research paradigm of pattern process-regional response",a case study of Xijiang River in Guangxi basin,based on RS,GIS and other technical means,in Guangxi Xijiang river basin land use change as the main line,using the method of literature analysis,the mathematical model of rating method,evaluation of the Xijiang River in Guangxi in recent 10 years,spatio-temporal patterns of land use change and its ecological effect,draw the following conclusions:(1)During the whole study period,the area of cultivated land and forest land decreased,and other land types increased.From the perspective of transfer matrix analysis,there are a large number of land transfer to the construction land,of which a large amount of arable land transfer.It shows that with the social and economic development,the level of urbanization has been continuously improved,and construction has occupied a large number of other land.(2)By selecting the appropriate landscape index of land use landscape were analyzed from the patch level and landscape level overall: cultivated land landscape patches increased significantly,the average patch area decreased,landscape dominance decreased;the number of patches of land for construction shall increase,the average patch area increased significantly;the forest landscape patch number is reduced,the average double patch area increased during the study period,that in recent years,the afforestation project has played a certain effect.On the whole,the number of land use patches in the study area increased in the study period,and the landscape was fragmented.(3)The results show that the total value of land ecological services in Guangxi Xijiang River Basin in the past 10 years has been changed gradually.The value of ecosystem services increased to a certain extent in the early stage of the study,and the latter was reduced,so it decreased during the whole study period.For the whole land ecosystem,forest ecosystem and water retention system play a major role.(4)On the whole,the study area has undergone 10 years of economic development,the infrastructure has been improved,the land use intensity has been enhanced,and the land use pattern and ecological environment have been improved to a certain degree.Compared with the past,the overall service function and environment have been improved.