JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1): 180-188.doi: 10.12302/j.issn.1000-2006.202111033

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Analysis of carbon sequestration effect of sloping land conversion program in Loess Plateau from the perspective of slope

YAO Nan1(), LIU Guangquan2, YAO Shunbo1,*(), JIA Lei1, LIN Ying3, DENG Yuanjie1, HOU Mengyang1   

  1. 1. College of Economics and Management,Northwest A&F University, Yangling 712100, China
    2. China Institute of Water Resources and Hydropower Research, Beijing 100048, China
    3. College of Economics and Finance, Xi’an Jiaotong University, Xi’an 710061, China
  • Received:2021-11-22 Accepted:2022-01-27 Online:2023-01-30 Published:2023-02-01
  • Contact: YAO Shunbo E-mail:yaonan@nwafu.edu.cn;yaoshunbo@163.com

Abstract:

【Objective】 The aims of this research were to explore the difference of carbon sequestration effect of farmland at different slopes on the Loess Plateau under the background of converting farmland to forest, and optimize a new round of converting farmland to forest project according to the change of carbon storage at different slopes. 【Method】 Based on the data of carbon sequestration in the Loess Plateau from 2000 to 2020 and land use data from 2000 to 2015, the spatial and temporal changes of carbon sequestration and the carbon sequestration benefits of farmland with different slopes were analyzed by using GIS spatial analysis method. 【Result】 From 2000 to 2020, carbon sequestration on the Loess Plateau increased significantly in the early stage, but slightly in the later stage. The change of carbon sequestration was basically consistent with the trend of forest cover, showing a phenomenon of high in the south and low in the north. From 2000 to 2015, land use structure of the Loess Plateau changed significantly, cultivaled land decreased significantly, forest and grassland coverage increased to 56.42%, and the carbon sequestration per unit area of each land use type showed an increasing trend, and the carbon sequestration per unit area of forest land was the largest. In addition, the carbon sequestration capacity of grassland was the strongest in areas with a slope lower than 15°, and that of forest was the strongest in areas with a slope higher than 15°. 【Conclusion】 The project of returning cropland to forest and grassland brought about huge carbon sequestration effect in Loess Plateau. The carbon sequestration ability of forest and grassland at different slopes was obviously different. The carbon sequestration ability of grassland at gentle slope was the strongest, and that of forest at middle and high slope was the strongest.

Key words: slope perspective, Loess Plateau, returning farmland to forest and grassland, effect of carbon sequestration

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