Study On Spatial And Temporal Simulation Of Vegetation Carbon Sink Using Quantitative Remote Sensing In Jilin Province

The problems that the concentrations of greenhouse gas as CO₂, CH₄continue torise and the following global warming related to the social and economic developmentworldwide, which produced a series of negative impact on human health, food andwater resources as well as social stability and economic development. Thereforeresearch the sources and sink of carbon of carbon cycle is an important topic in thestudy of global issues. Vegetation play an important role in the carbon cycle as themain platform of the carbon sources or carbon sink, so it appears particularlyimportant in the research of vegetation carbon sink.In this paper, the author participated in the tutor's National Natural ScienceFoundation-"The impact and drive mechanism of LUCC to soil organic carbon inwestern Jilin Province over the past50years", consulted extensive literatures on netprimary productivity and vegetation carbon sink, estimated the net primaryproductivity and vegetation carbon sink in Jilin Province based on3S technology andmodeling methods on the basis of the existing research work, studied its spatialdistribution, analyzed systematically the affecting factors of vegetation carbon sink.First of all, the study preprocessed the MODIS images, meteorological data andother basic data by the3S integration technology, building the CASA model tocalculate the NPP in Jilin Province in2001-2010. The results showed that the NPPwas higher in the summer and lower in winter. In the ten years, NPP showedfluctuating changes, NPP was lowest of395.18gC m^-2 a^-1in2003and the highestreach480.67gC m^-2 a^-1in2008. Spatial distribution mainly characterized bygradually increasing trend from west to east, the NPP in western Jilin Province waslowest, mainly distributed in100-400gC m^-2 a^-1. The NPP in central Jilin Provincewas higher, mainly in300-600gC m^-2 a^-1. The NPP in eastern Jilin Province was thehighest, mainly in400-800gC m^-2 a^-1. The study determined the change of NPP inJilin Province in the ten years and provided the main basic data for Estimating thevegetation carbon sink based on the NPP. Secondly, the study estimated the NEP in Jilin Province and analyzed thevariation of vegetation carbon sink in Jilin Province based on calculating the soilmicrobial respiration and NPP. The vegetation carbon sequestration in whole provinceincreased in the fluctuations in2001-2010. Vegetation carbon sink was263.29gC m^-2 a^-1in2001, vegetation carbon sink increased to326.38gC m^-2 a^-1in2002, thevegetation carbon sink sequestration was240.30gC m^-2 a^-1in2003, carbon sinksequestration to329.51gC m^-2 a^-1in2008, the amount of carbon sink has declined,approximately278.77gC m^-2 a^-1in2010. Jilin vegetation carbon sink presents thelaw of gradual increase from west to east. The region which NEP<0gC m^-2 a^-1was inwest Jilin Province, expressed as carbon sources, carbon sequestration in-147.8-0gC m^-2 a^-1. In the remaining areas of western Jilin province, the vegetation carbon sink isrelatively low, mainly in the100-300gC m^-2 a^-1. The carbon sink was higher in Jilin'scentral region in200-600gC m^-2 a^-1. The highest carbon sink was in eastern JilinProvince, mainly in the200-800gC m^-2 a^-1.Finally, the study analyzed the influencing factors of the distribution ofvegetation carbon sink, the results show that: In the impact factors of the annualmonthly vegetation carbon sink, air temperature, precipitation and solar radiation hada great effect. The impact factors of the variation role of the inter-annual vegetationcarbon sink in the10years followed by NDVI> temperature> precipitation> solarradiation affecting the size of the order. Precipitation had a great effect in the spatialvariation of the vegetation carbon sink.This thesis researched the temporal-spatial variation and impact factors ofvegetation carbon sink in Jilin Province on different perspectives based on theapplication of3S technology, MODIS remote sensing data and non-remote sensingdata. Research methods involved a reference value of global carbon sources and sinkand carbon sequestration estimates. The results had an important guide meaning inecological protection and economic development of Jilin Province, it had importanttheoretical significance and application value that provided a scientific basis and otheraspects on the quantitative assessment of China indicates the role of China'scontribution in the mitigation of global climate change and CO2emission reduction.