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Analysis of spatial-temporal variation in NPP based on hydrothermal conditions in the Lancang-Mekong River Basin from 2000 to 2014

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Abstract

Against the background of global climate change, spatial-temporal variation in net primary productivity (NPP) has attracted much attention. To analyze NPP spatial-temporal variation within the context of changes in hydrothermal conditions, the Vegetation Photosynthesis Model (VPM) is used to elucidate the mathematical relationship between NPP and hydrothermal conditions. Based on this spatial-temporal pattern of NPP and hydrothermal conditions in the Lancang-Mekong River Basin, regression statistics, an empirical model of land evaporation, and the water and thermal product index (K) are used to evaluate correlations between NPP and hydrothermal conditions in terms of their distribution pattern and interaction. The results show the following. (1) From 2000 to 2014, NPP in the Lancang-Mekong River Basin was highest in the central region and gradually decreased toward the southwest and northwest, whereas the annual change rate in NPP showed no significant increasing trend. (2) In the Lancang Basin, the correlation between hydrothermal conditions and NPP was high with respect to their distribution patterns, though this correlation was low in the Mekong Basin. (3) Correlation between K and NPP is high in the region where the effects of water and thermal factors on vegetation growth are similar. (4) K is an effective complement to the correlation between a single hydrothermal factor (temperature or precipitation) and NPP, and the influence of hydrothermal conditions on NPP was positive in the Lancang River and negative in the Mekong River Basin. Our study quantitatively analyzes the spatial-temporal correlation between NPP and hydrothermal conditions. The findings can reflect the vegetation change tendency and provide scientific data for ecological environment development and protection in the study area.

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Funding

The study received support from the National Key Research and Development Program of China (2016YFA0601601), International partnership program of Chinese Academy of Sciences (grant no. 131551KYSB20160002), the project of Tianshan innovation team (Y674122), and the One Thousand Youth Talents Plan of China (Xinjiang Project: Y374231).

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Authors and Affiliations

  1. School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, 454000, China

    Wei Li, Changchun Li & Baoshan Wang

  2. Xinjiang Institute of Ecology and Geography, Urumqi, 832003, China

    Wei Li, Changchun Li, Anming Bao, Qiuxiang Yi & Tie Liu

  3. Chinese University of Hong Kong, Hong Kong, 999077, China

    Xuefeng Liu

  4. Yunnan University, Kunming, 650091, China

    Daming He

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  1. Wei Li
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  2. Changchun Li
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  3. Xuefeng Liu
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  4. Daming He
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  5. Anming Bao
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  6. Qiuxiang Yi
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  7. Baoshan Wang
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  8. Tie Liu
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Correspondence to Changchun Li.

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Li, W., Li, C., Liu, X. et al. Analysis of spatial-temporal variation in NPP based on hydrothermal conditions in the Lancang-Mekong River Basin from 2000 to 2014. Environ Monit Assess 190, 321 (2018). https://doi.org/10.1007/s10661-018-6690-7

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  • DOI: https://doi.org/10.1007/s10661-018-6690-7

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