Quantification And Evaluation Of Typical Ecological Services In Haihe River Basin Based On Remote Sensing And GIS

In the context of huge threats to the ecological environment in many regions of my country,carrying out various forms of research on ecosystem services based on watershed scale has become a hot topic.The Haihe River Basin is one of the most prominent water resource contradictions in my country,and it is prone to large-scale soil erosion under the effect of heavy precipitation.Based on remote sensing and GIS,this study applied the InVEST-SDR model,InVEST-Water Yield model,and CASA model to carry out the quantification and evaluation of soil retention service,water conservation service,and carbon sequestration service from 2000 to 2017 in the Haihe River Basin.Taking 84 small watersheds divided by the Haihe River Basin as the research unit,first,the cover data,remote sensing data,soil data,and meteorological data are processed into the input parameters of each model according to the selected method,and then these parameters are brought into the model to obtain quantified value of each ecosystem services,and finally,based on the quantitative values,carry out spatial-temporal analysis,correlation analysis,analysis of driving factors(meteorological factors,land-use factors),and synergycompetition analysis of each ecosystem services,The thesis mainly achieved the following research conclusions:1)Some small watersheds in the southwest of the Haihe River Basin have the most soil solids,while the scattered small watersheds on the west side of the Haihe River Basin have the least soil solids,over the years,the increase in soil solids in the north relative to the south has been greater and more significant.The water conservation in the Haihe River Basin increases from northwest to southeast,and the degree of growth in water conservation over the years has gradually increased from north to south.The carbon Sequestration in the North China Plain is more than that in the Loess Plateau,The carbon stocks in the northwest and southeast has relatively large increase.2)The increase of total precipitation will increase soil retention.The increase of total precipitation and average relative humidity can obviously promote the water conservation,and the increase of average temperature,average wind speed and total sunshine hours have a significant inhibitory effect on water conservation service.The increase of total precipitation has a significant inhibitory effect on carbon sequestration,and the increase of average temperature and total sunshine hours has a significant promotion effect on carbon sequestration service3)Compared with 2010,the types of land in 2015 changed a lot,and The main pattern of each land use type change during this period were taken as the research object.For the change of soil conservation,for most change patterns,land types change played a leading role relative to changes in meteorological factors,for the change of water yield,The number of land types playing a leading role is significantly less than that of soil sequestration and the degree of impact is lower overall,for most change patterns,the change of meteorological factors play a leading role;for the change of carbon sequestration,the change of land type is dominant in most change patterns and the dominant degree fluctuates greatly.4)Soil retention and water yield are synergistic relationship(r=0.556),soil conservation and carbon sequestration are offset relationship(r=-0.167),water yield and carbon sequestration are offset relationship(r=-0.317,p<0.01).After calculating the correlation coefficient of each ecosystem year-by-year,the conclusion is that there is a positive correlation between each ecological as a whole.The correlation degree of water yield and carbon sequestration is the highest,that of soil conservation and carbon sequestration is the second,that of water yield and soil conservation is the lowest.