Geo-Information Tupu Analysis of Typical Ecosystem Services in Shiyanghe River Basin

Author:Ma Jing

Supervisor:zhang ren zuo


Degree Year:2019





The study is based on landscape ecology,regional sustainable development and geospatial spatial analysis theory.Supported by RS and GIS technologies,geophysical information maps,InVEST models,spatial analysis,and remote sensing are used.The spatial and temporal changes of typical ecosystem service in the Shiyang River Basin from 1986 to 2015 were studied.Based on the theory of landscape ecology、geography space analysis and regional sustainable development theory,and supported by RS and GIS technology,this study used the InVEST model,geo-information TuPu analysis,spatial analysis technology and other technology,to modeled 30 years time scale spatial and temporal variation of the ecosystem service of Shiyanghe River Basin.The main research results were as follows:1.In the Shiyanghe River Basin,the dominant landscape types are unused land,grassland and farmland,and the area of cultivated land and construction land increased in 30 years.especially the area of construction land increased significantly,and the area of forest,grassland and unused land decreased,and the area of water decreased first and then increased,The Landscape changes show a slow-sharp-contraction state,Landscape patch agglomeration is weakened and heterogeneity is enhanced,landscape patches of mutual influence and cutting degree increased,the degree of disorder increased,and tends to be scattered and fragmente.Landscape changes are mainly concentrated in 2000-2010,the most obvious performance is the waters and construction land,and the indexes fluctuate greatly.2.The average value of habitat quality decreased by 3.22%,and the scope of change is expanding continuously.The breadth of human influence is expanding in space,and the original oasis area can not meet the needs of river basin development.The increase of construction land,and the expansion of road space for road traffic is the main reason for the change of habitat quality.The range of habitat quality reduction is far greater than the range of improvement,and the overall habitat quality of the basin is not high.The analysis of geo-information Tupu of various ecosystem services in the 30a watershed shows that the area with stable habitat is 60.2%and the area of reduced area is 29.89%.The reduced area is mainly distributed in the basin Oasis and the transition zone between oasis and desert,belonging to the region with the greatest influence of human resources.The repeatedly changing areas are mainly small patches interspersed in the region between the oasis and desert.The habitat quality is extremely sensitive,which is greatly disturbed by human activities and fluctuates obviously.3.During the 30 years,soil surface carbon reserves in the basin increased by 29.97.29million tons(27%),showing an overall trend of"carbon sink".The carbon reserves are lower in the central corridor and the lowest in the northern hilly and desert areas.The improvement of soil organic matter content and the change of land use landscape pattern lead to a large difference in the spatial variation of soil carbon storage.In the past 30 years,carbon storage in most areas of the basin has been carbon sink,accounting for 87.51%of the total area;The stable unchanged area accounts for 9.03%,which is a region with relatively stable soil structure and land use landscape pattern.The carbon source area accounts for 1.35%.Repeated changes accounted for 2.1%.The main reason for affecting soil surface carbon storage is the transfer of soil organic matter and land use types.4.In the past 30 years,soil erosion in the basin presented several stages of increase-sharp decline-recovery.The most serious period of soil erosion is 2000,and in 2010 has improved.The main types of soil erosion are micro-erosion,accounting for more than 80%of the total area of soil erosion.The long-time scale and large spatial scale are mainly affected by the change of precipitation erosion.The shorter time scale and small space scale are mainly affected by the change of land use pattern.The main Geo-information Tupu map of soil erosion is repeated changes type,which is affected by the decrease of rainfall erosion.In 2010,the degree of soil erosion decreased significantly,and in the early and late periods,the increase in the medium-term decline accounted for a large proportion.The stable unchanged area is very small and distributed along the river in a linear pattern along the main river course of the basin,which is a relatively stable area.5.The analysis of geo-information Tupu results show that the shiyanghe river basin ecosystem services rendered stable not variant,stable,reduce and changed repeatedly four types,Integrated map information,shiyanghe river basin ecosystem services can be divided into oasis core area,desert oasis transition zone and the ecological barrier zone three areas,covers an area of 113.77×10~4hm~2(28.04%)、27.23×10~4hm~2(6.71%)、244.93×10~4hm~2(60.38%),The corresponding protection types are habitat protection and soil erosion protection,habitat and soil erosion protection and soil erosion protection respectively.The Geo-information Tupu of the ecosystem function can represent the changes of the ecosystem service in different spatial and different spatial locations,which can reflect the spatial and temporal dynamics of the ecosystem services more comprehensively.