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Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (6): 59-69.DOI: 10.7522/j.issn.1000-694X.2025.00016

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Carbon sequestration in typical sandy lands of China from 1982 to 2024Patternsevolutionand driving forces

Huishi Du1(), Wei Qu1, Hasi Eerdun2()   

  1. 1.College of Geographical Science and Tourism,Jilin Normal University,Siping 136000,Jilin,China
    2.School of Natural Resources,Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China
  • Received:2024-12-13 Revised:2025-04-01 Online:2025-11-20 Published:2025-11-26
  • Contact: Hasi Eerdun

Abstract:

The potential of carbon sequestration in typical sandy regions of China has long been overlooked,with a lack of systematic analysis over long time series and quantitative assessments of the driving mechanisms of climate change and human activities. In this study,we employed the CASA and Thornthwaite Memorial models to analyze the spatiotemporal variations in net ecosystem productivity (NEP) across typical sandy areas,including the Mu Us Sandy Land,the Hunshandake Sandy Land,the Horqin Sandy Land,the Hulun Buir Sandy Land,and the Songnen Sandy Land,from 1982 to 2024. We also explored the driving mechanisms of meteorological and human factors on the evolution of NEP. The results show that,by 2024,the average annual NEP of the typical sandy regions was 166.67 g·m-2·a-1,with significant spatial differentiation. The carbon sequestration capacity in the eastern regions was notably higher than in the western regions. Among these areas,the Songnen Sandy Land exhibited the strongest carbon sequestration capacity,with an annual NEP of 211.08 g·m-2·a-1,while the Mu Us Sandy Land had a weaker carbon sequestration capacity,with an annual NEP of only 122.68 g·m-2·a-1. From 1982 to 2024,the overall NEP of these regions showed a decline followed by a recovery,reaching a minimum of 130.68 g·m-2·a-1 in 2000 and subsequently rising to 166.67 g·m-2·a-1 by 2024. In terms of spatial changes,the areas with increased carbon sequestration accounted for 59.96% (10.03×10⁴ km²) of the total study area,with significant increases covering 57.79% (96 682.67 km²),primarily distributed in the Hulun Buir Sandy Land and the Songnen Sandy Land. In contrast,areas with significant decreases accounted for 35.85% (59 977.05 km²),mostly in the Mu Us Sandy Land and the Hunshandake Sandy Land. Human activities were the dominant factor contributing to the improvement of carbon sequestration,with a relative contribution rate of 49.33%. This study provides scientific evidence for carbon neutrality and ecological conservation in sandy regions.

Key words: sandy land ecosystems, carbon sequestration, net ecosystem productivity, meteorological factors, human factors

CLC Number: