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The Grain for Green Project May Enrich the Mercury Concentration in a Small Karst Catchment, Southwest China

Author

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  • Rui Qu

    (Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China)

  • Guilin Han

    (Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China)

Abstract

The Chinese project, better known as the Grain for Green Project (GGP), has changed the land-use type in the karst area of Puding county, Guizhou province, southwest China, and this study is aimed at evaluating the Hg distribution and determining factors in soils after the land-use change. A total of ten soil profiles were selected in the typical karst region, and the land-use types were divided into native vegetation land (NVL), farmland (FL), and abandoned farmland (AFL). Total Hg concentration under different land-use types increased in the order: NVL (average 63.26 μg∙kg −1 ) < FL (average 71.48 μg∙kg −1 ) < AFL (average 98.22 μg∙kg −1 ). After agricultural abandonment for four to five years with a cover of native vegetation in the AFL, a higher concentration of Hg compared to the other two land-use types indicate that the Hg accumulation in soil results from vegetation restoration of AFL due to land-use change. Soil organic carbon (SOC) and macro-aggregates were highly correlated to Hg concentration in this study. Macro-aggregates can provide a stable condition for Hg due to the thin regolith and high porosity in the karst region. A high proportion of macro-aggregates can reduce the mobility of Hg in the karst area. Intense tillage can significantly reduce the formation of macro-aggregates in FL, but the macro-aggregates in AFL were recovered as well as those in NVL, resulting in the accumulation of Hg.

Suggested Citation

  • Rui Qu & Guilin Han, 2020. "The Grain for Green Project May Enrich the Mercury Concentration in a Small Karst Catchment, Southwest China," Land, MDPI, vol. 9(10), pages 1-13, September.
    • Handle: RePEc:gam:jlands:v:9:y:2020:i:10:p:354-:d:419876
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    References listed on IDEAS

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    1. Wang, Bing & Gao, Peng & Niu, Xiang & Sun, Jianni, 2017. "Policy-driven China’s Grain to Green Program: Implications for ecosystem services," Ecosystem Services, Elsevier, vol. 27(PA), pages 38-47.
    2. Zhang, Wei & Zhen, Gengchong & Chen, Long & Wang, Huanhuan & Li, Ying & Ye, Xuejie & Tong, Yindong & Zhu, Yan & Wang, Xuejun, 2017. "Economic evaluation of health benefits of mercury emission controls for China and the neighboring countries in East Asia," Energy Policy, Elsevier, vol. 106(C), pages 579-587.
    3. Wei, Hejie & Fan, Weiguo & Wang, Xuechao & Lu, Nachuan & Dong, Xiaobin & Zhao, Yanan & Ya, Xijia & Zhao, Yifei, 2017. "Integrating supply and social demand in ecosystem services assessment: A review," Ecosystem Services, Elsevier, vol. 25(C), pages 15-27.
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    1. Nichole Reed & Brenda Molano-Flores & Eduardo Dias de Oliveira & Erika Meraz & Samira Umar & Christopher J. Whelan & Miquel A. Gonzalez-Meler, 2021. "Does Pastoral Land-Use Legacy Influence Topsoil Carbon and Nitrogen Accrual Rates in Tallgrass Prairie Restorations?," Land, MDPI, vol. 10(7), pages 1-20, July.

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