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The effects of climate factors and human activities on net primary productivity in Xinjiang

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Abstract

Net primary productivity (NPP) is an index of the increase in plant biomass. Plant biomass is an important component of the global carbon cycle that indicates the health of an ecosystem. Environmental restoration has recently received much attention in Xinjiang, and it is thus important to quantify the dynamic effects of the drivers of NPP in the region. NPP was calculated for the annual growing season from 1982 to 2013 using the Carnegie-Ames-Stanford Approach (CASA) model. The effects of climate factors on NPP were analyzed, and the relationships between NPP and climate factors as well as human activity were quantified. Additionally, an innovative method based on partial derivatives and residual error was proposed to calculate the contributions of climate factors and human activities. The results show that average annual NPP in Xinjiang was 57.45 g C m−2 from 1982 to 2013 and that the average increase in annual NPP was 0.23 g C m−2 year−1. The average increases in annual NPP due to temperature, precipitation, and solar radiation were 0.0095, 0.2679, and 0.2541 g C m−2 year−1; the average decreases were respectively − 0.0133, − 0.0521, and − 0.0725 g C m−2 year−1. Precipitation and solar radiation influence NPP more than temperature. Precipitation had the greatest effect on NPP in the first 19 years, but solar radiation became more influential after 2000. Climate conditions were favorable for increase in NPP before 2000. The environmental restoration also occurred in Xinjiang during that period, and human activity slightly decreased NPP. Human activity increased and had a greater effect on NPP after 2000.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT, USA

    Yelin Jiang

  2. School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, China

    Yelin Jiang, Qing Peng, Yanlong Guan & Yang Zhang

  3. Xinjiang Academy Forest, Urumqi, China

    Jing Guo

  4. Institute of Arid Ecology and Environment, Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi, China

    Renping Zhang

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  1. Yelin Jiang
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  2. Jing Guo
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  3. Qing Peng
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  4. Yanlong Guan
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  5. Yang Zhang
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  6. Renping Zhang
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Correspondence to Yelin Jiang or Jing Guo.

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Jiang, Y., Guo, J., Peng, Q. et al. The effects of climate factors and human activities on net primary productivity in Xinjiang. Int J Biometeorol 64, 765–777 (2020). https://doi.org/10.1007/s00484-020-01866-4

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