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Change in Alpine Grassland NPP in Response to Climate Variation and Human Activities in the Yellow River Source Zone from 2000 to 2020

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  • Feng Zhang

    (College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China)

  • Xiasong Hu

    (College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China)

  • Jing Zhang

    (College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China)

  • Chengyi Li

    (College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China)

  • Yupeng Zhang

    (College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China)

  • Xilai Li

    (College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China)

Abstract

Identifying the relative contributions of climate change and human activities to alpine grassland dynamics is critical for understanding grassland degradation mechanisms. In this study, first, the actual NPP (NPP a ) was obtained by MOD17A3. Second, we used the Zhou Guangsheng model to simulate the potential met net primary productivity (NPP p ). Finally, the NPP generated by anthropogenic activities (NPP h ) was estimated by calculating the difference between NPP p and NPP a . Then, the relative contributions of climate change and human activities to NPP changes in grasslands were quantitatively assessed by analyzing trends in NPP p and NPP a . Thereby, the drivers of NPP change in the Yellow River source grassland were identified. The results showed that the temperature and precipitation in the study area showed a warm-humid climate trend from 2000 to 2020. The NPP p and NPP a increased at a rate of 1.07 g C/m 2 and 1.51 g C/m 2 per year, respectively, while the NPP h decreased at a rate of 0.46 g C/m 2 per year. It can be seen that human activities had a positive effect on the change of NPP in the Yellow River source grassland from the change rate. The relative contribution analysis showed that 55.90% of grassland NPP increased due to climate change, 40.16% of grassland NPP increased due to human activities, and the grassland degradation was not significant. The research results can provide a theoretical basis and technical support for the next step of the Yellow River source grassland ecological protection project.

Suggested Citation

  • Feng Zhang & Xiasong Hu & Jing Zhang & Chengyi Li & Yupeng Zhang & Xilai Li, 2022. "Change in Alpine Grassland NPP in Response to Climate Variation and Human Activities in the Yellow River Source Zone from 2000 to 2020," Sustainability, MDPI, vol. 14(14), pages 1-15, July.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:14:p:8790-:d:865570
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    References listed on IDEAS

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    1. Ying Zhang & Chaobin Zhang & Zhaoqi Wang & Ru An & Jianlong Li, 2019. "Comprehensive Research on Remote Sensing Monitoring of Grassland Degradation: A Case Study in the Three-River Source Region, China," Sustainability, MDPI, vol. 11(7), pages 1-15, March.
    2. Laga Tong & Xinliang Xu & Ying Fu & Shuang Li, 2014. "Wetland Changes and Their Responses to Climate Change in the “Three-River Headwaters” Region of China since the 1990s," Energies, MDPI, vol. 7(4), pages 1-20, April.
    3. Chen, Aifang & Li, Ruiyun & Wang, Honglin & He, Bin, 2015. "Quantitative assessment of human appropriation of aboveground net primary production in China," Ecological Modelling, Elsevier, vol. 312(C), pages 54-60.
    4. Chen Jun & Yifang Ban & Songnian Li, 2014. "Open access to Earth land-cover map," Nature, Nature, vol. 514(7523), pages 434-434, October.
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