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Observed Vegetation Greening and Its Relationships with Cropland Changes and Climate in China

Author

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  • Yuzhen Zhang

    (Beijing Engineering Research Center of Industrial Spectrum Imaging, School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Shunlin Liang

    (Department of Geographical Sciences, University of Maryland, College Park, MD 20740, USA)

  • Zhiqiang Xiao

    (State Key Laboratory of Remote Sensing Science, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China)

Abstract

Chinese croplands have changed considerably over the past decades, but their impacts on the environment remain underexplored. Meanwhile, understanding the contributions of human activities to vegetation greenness has been attracting more attention but still needs to be improved. To address both issues, this study explored vegetation greening and its relationships with Chinese cropland changes and climate. Greenness trends were first identified from the normalized difference vegetation index and leaf area index from 1982–2015 using three trend detection algorithms. Boosted regression trees were then performed to explore underlying relationships between vegetation greening and cropland and climate predictors. The results showed the widespread greening in Chinese croplands but large discrepancies in greenness trends characterized by different metrics. Annual greenness trends in most Chinese croplands were more likely nonlinearly associated with climate compared with cropland changes, while cropland percentage only predominantly contributed to vegetation greening in the Sichuan Basin and its surrounding regions with leaf area index data and, in the Northeast China Plain, with vegetation index data. Results highlight both the differences in vegetation greenness using different indicators and further impacts on the nonlinear relationships with cropland and climate, which have been largely ignored in previous studies.

Suggested Citation

  • Yuzhen Zhang & Shunlin Liang & Zhiqiang Xiao, 2020. "Observed Vegetation Greening and Its Relationships with Cropland Changes and Climate in China," Land, MDPI, vol. 9(8), pages 1-19, August.
    • Handle: RePEc:gam:jlands:v:9:y:2020:i:8:p:274-:d:399666
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    References listed on IDEAS

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    Cited by:

    1. Yan Li & Jie Gong & Yunxia Zhang & Bingli Gao, 2022. "NDVI-Based Greening of Alpine Steppe and Its Relationships with Climatic Change and Grazing Intensity in the Southwestern Tibetan Plateau," Land, MDPI, vol. 11(7), pages 1-16, June.
    2. Hongliang Gu & Min Chen, 2021. "Comprehensive Insights into Spatial-Temporal Evolution Patterns, Dominant Factors of NDVI from Pixel Scale, as a Case of Shaanxi Province, China," IJERPH, MDPI, vol. 18(19), pages 1-27, September.

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