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[1]LI Peng,ZHANG Yong,LI Xiahaoqi,et al.Effect of Soil Carbon Sink in the Hilly Region of the Loess Plateau Under Grain for Green Project[J].Research of Soil and Water Conservation,2021,28(04):29-33.

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Effect of Soil Carbon Sink in the Hilly Region of the Loess Plateau Under Grain for Green Project

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 04 Page number: 29-33 Column: Public date: 2021-08-10

Title:: Effect of Soil Carbon Sink in the Hilly Region of the Loess Plateau Under Grain for Green Project

Author(s):: LI Peng¹, ZHANG Yong², LI Xiahaoqi³, SUN Caili⁴, DUAN Aohua¹, LIU Guobin^1,5; (1.Institute of Soil and Water Conservation,NorthwestA&FUniversity,Yangling,Shaanxi712100,China; 2.ShaanxiAcademy of Forestry,Xi'an710082,China; 3.College of Natural Resources and Environment,NorthwestA&FUniversity,Yangling,Shaanxi712100,China; 4.College of Eco-Environmental Engineering,GuizhouMinzuUniversity,Guiyang550025,China; 5.StateKeyLaboratory of Soil Erosion and Dryland Farming on the LoessPlateau,Institute of Soil and Water Conservation,CAS&MWR,Yangling,Shaanxi712100,China)

Keywords:: Grain for Green; soil organic carbon storage; restoration type; restoration ages; soil depths

CLC:: S151.9

DOI:: -

Abstract:: With the aim to analyze the variation characteristics of soil organic carbon reserves after returning cropland to forest(grassland)on the Loess Plateau, soil with different depths(0—20cm, 0—30cm, 0—50cm and 0—100cm)and various vegetation with different restoration ages including Robinia pseudoacacia (5a, 10a, 20a and 56a), Caragana korshinskii(5a, 10a, 20a and 30a), Hippophae rhamnoides(10a, 20a, 36a and 47a)and natural grassland(5a, 10a, 15a, 20a, 25a and 30a)were selected as the objects of this study, the law of soil organic carbon(SOC)reserves after vegetation restoration was analyzed, and the relationship between soil organic carbon reserves in 0—20cm soil layer and 0—100cm was discussed. The results showed that soil organic carbon reserves of each soil layer increased with the recovery years in four restoration patterns. Meanwhile, the carbon sequestration rate of the 0—20 cm soil layer followed the order of Caragana korshinskii [0.048 g/(kg·a)]>Robinia pseudoacacia [0.023 g/(kg·a)]>natural grassland [0.020 g/(kg·a)]>Hippophae rhamnoides [0.012 g/(kg·a)]. In addition, a significant positive correlation was found between soil organic carbon of 0—20cm soil layer and 0—100cm soil layer(F=169.6;R²=0.755; p<0.001). Overall, Grain for Green project can significantly increase SOC storage, and Caragana korshinskii is more conductive to SOC accumulation, compared with other treatments. In addition, the SOC of 0—20 cm soil layer could be used to estimate the potential carbon sequestration of conversion of farmland to forest. This study is conducive to enhancing the understanding of soil carbon sequestration during vegetation restoration in the Loess Plateau and providing theoretical reference for regional carbon cycle.

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Last Update: 2021-08-20