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Quantitative Evaluation Of Carbon Storage Changes In Jinghe River Basin Before And After The Grain For Green Project

Posted on:2023-01-07Degree:MasterType:Thesis
Country:ChinaCandidate:Y X LianFull Text:PDF
GTID:2543306776490234Subject:Agricultural Soil and Water Engineering
Abstract/Summary:PDF Full Text Request
In the context of climate and environmental change,the carbon cycle from regional to global is also changing.Under the restoration and management of vegetation construction measures such as the Grain for Green Project,vegetation coverage has increased and the carbon sequestration ability of the ecosystem has changed.Therefore,taking The Jinghe River Basin as an example and based on the RHESSys eco-hydrological model,the carbon density and carbon storage in Jinghe River Basin were estimated.Based on the data of meteorological(such as precipitation,maximum temperature,minimum temperature and evapotranspiration),vegetation(NDVI and vegetation area change)and other environmental factors,the main controlling factors of carbon cycle in Jinghe River basin were analyzed by using correlation analysis method,and ecological management suggestions suitable for Jinghe river basin were put forward.The main progress made is as follows:(1)The temporal distribution characteristics and spatial distribution characteristics of carbon density and carbon storage were clarified.The annual average carbon density of vegetation was 1.240 kg C/m~2,that of soil was 4.819 kg C/m~2,that of litter was 0.192 kg C/m~2,and that of total carbon was 6.251kg C/m~2.The soil carbon pool accounted for the largest proportion of total carbon pool.The total carbon storage of the basin was 0.2973 Pg,including 0.0595 Pg of vegetation,0.2292 Pg of soil and 0.0085 Pg of litter,accounting for20.03%,77.11%and 2.56%of the total carbon storage of the basin,respectively.(2)The main influencing factors of carbon density change were analyzed.Many other vegetation carbon density,the density of soil carbon,litter carbon density density and total carbon density and the correlation of longitude and latitude,altitude,slope,soil texture is weak,and the correlation of meteorological factors such as precipitation,air temperature is obvious,and also the correlation of vegetation coverage,land use type is also one of the main reasons affecting the carbon.(3)Carbon storage and its spatial distribution pattern in different ecosystems were evaluated.The carbon storage of forest ecosystem,grassland ecosystem and farmland ecosystem were 0.0195 Pg,0.1309 Pg and 0.1199 Pg,respectively,indicating that the carbon storage was mainly in grassland ecosystem and farmland ecosystem,and grassland ecosystem was slightly higher than farmland ecosystem.The spatial pattern of carbon storage in different ecosystems gradually decreased from southeast to northwest.In conclusion,the ecological environment of Jinghe River basin was improved after vegetation restoration,but the carbon density was still relatively low and the spatial distribution was uneven.In order to improve the effect and capacity of basin carbon sequestration,various environmental factors should be taken into overall consideration,and appropriate management measures should be formulated according to local conditions to provide guidance for realizing dual carbon goals and future ecological construction.
Keywords/Search Tags:The Loess Plateau, The Grain for Green project, The Jinghe River Basin, Carbon storage, Eco-hydrological model
PDF Full Text Request
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