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Understanding the impacts of ‘Grain for Green’ land management practice on land greening dynamics over the Loess Plateau of China

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  • Liu, Zhengjia
  • Wang, Jieyong
  • Wang, Xiaoyue
  • Wang, Yongsheng

Abstract

Land greening in China is regarded as contributing a great deal to greening of the Earth. The phenomenon is mainly attributed to climate change, arising atmospheric CO2 and ‘Grain for Green’ (GFG) land management policies. However, limited knowledge is known how much land greening is from contributions of the GFG practice. Therefore, the study took the typical region of the GFG practice, the Loess Plateau, as the study area, and used 1982–2015 satellite-observed GIMMS3g normalized difference vegetation index (NDVI) data, ERA-Interim climatic variables (precipitation, temperature and solar radiation) and atmospheric CO2 concentration data with the help of a developed TPRC-based NDVI model to derive GFG-induced NDVI after 1999. Furthermore, this study tracked the spatial-temporal dynamics of GFG-induced NDVI and assessed contributions of the GFG practice to regional vegetation changes. Results showed that satellite-observed NDVI and TPRC-based NDVI both exhibited an increasing spatial pattern from the northwestern to southeastern Loess Plateau, but their greening trends were separately 0.0022 and 0.0009 per year in 1982–2015 (p < 0.05). Note that the satellite-observed greening trend was much steeper with a slope of 0.0056 per year after 2006 (p < 0.05). The subsequent analyses documented that GFG-induced land greening were largely responsible for the steep trend. In space, evident greening patterns began to be observed in the central Loess Plateau from 2006 to 2008, afterwards expanded towards eastern and southwestern Loess Plateau. In 2011–2015, the increase magnitude of GFG-induced land greening in the Loess Plateau averagely accounted for 8.5 % in comparison to estimated TPRC-based NDVI, but in six natural zones were various, ranging from 3.2%–15.7%. In some regions of central Loess Plateau, GFG-induced NDVI contributed even more than 20 % to vegetation increase. This study highlights that land use management contributes more to land greening dynamics over the Loess Plateau compared to climate change and arising atmospheric CO2 concentration. These findings likely provide some valuable information for curbing or enhancing specific-location vegetation changes in future regional land management and planning.

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  • Liu, Zhengjia & Wang, Jieyong & Wang, Xiaoyue & Wang, Yongsheng, 2020. "Understanding the impacts of ‘Grain for Green’ land management practice on land greening dynamics over the Loess Plateau of China," Land Use Policy, Elsevier, vol. 99(C).
    • Handle: RePEc:eee:lauspo:v:99:y:2020:i:c:s0264837720308061
    DOI: 10.1016/j.landusepol.2020.105084
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    2. Yuanming Xie & Zemeng Ma & Mingjie Fang & Weiguo Liu & Feiyan Yu & Jiajing Tian & Shuoxin Zhang & Yan Yan, 2023. "Analysis of Net Primary Productivity of Retired Farmlands in the Grain-for-Green Project in China from 2011 to 2020," Land, MDPI, vol. 12(5), pages 1-16, May.
    3. Dingrao Feng & Wenkai Bao & Meichen Fu & Min Zhang & Yiyu Sun, 2021. "Current and Future Land Use Characters of a National Central City in Eco-Fragile Region—A Case Study in Xi’an City Based on FLUS Model," Land, MDPI, vol. 10(3), pages 1-25, March.
    4. Yuanjie Deng & Lei Jia & Yajun Guo & Hua Li & Shunbo Yao & Liqi Chu & Weinan Lu & Mengyang Hou & Binbin Mo & Yameng Wang & Haiyu Yang & Tongyue Zhang, 2022. "Evaluation of the Ecological Effects of Ecological Restoration Programs: A Case Study of the Sloping Land Conversion Program on the Loess Plateau, China," IJERPH, MDPI, vol. 19(13), pages 1-20, June.

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