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Spatial-temporal changes in NPP and its relationship with climate factors based on sensitivity analysis in the Shiyang River Basin

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Abstract

As a typical inland river basin in China, the Shiyang River Basin is characterized by its special mountain-basin structure. The ecological health in the basin is related to the sustainable development of the economy and society. At present, there are few studies on net primary productivity (NPP) in the Shiyang River Basin, and the existing analysis of the relationship between NPP and climatic factors is lacking. The upper mountainous area and the middle and lower oasis areas in the Shiyang River Basin were selected as the study area. The NPP of the study area was estimated using the Thornthwaite Memorial Model. The spatial and temporal characteristics of NPP were analyzed by Sen’s slope method. Based on the sensitivity analysis, the correlation of the main climate factors to NPP was estimated. According to the aforementioned work, the variation trend of the future NPP was predicted. The results showed that NPP in the study area increased from 1981 to 2015 with the increase in temperature and precipitation. The spatial heterogeneity of the change trend of NPP was not significant, but the spatial heterogeneity of the rangeability was strong. The NPP was highly sensitive to precipitation, relative humidity and net solar radiation. By integrating the changes in climatic elements, the temperature, precipitation and relative humidity contributed the main parts of the change in NPP. The NPP is predicted to increase by 4.9–8.1% by 2050 according to the amplitude of climate change over the past 35 yrs.

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Acknowledgments

This study was financially supported by the National Key Research and Development Program of China (2017YFC0404701) and the National Key Research and Development Program during the 13th five-year plan, Ministry of Science and Technology, PRC (2016YFA0601500). We thank the anonymous reviewers and the Editor for their suggestions, which substantially improved the manuscript.

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Correspondence to Weihua Xiao.

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Communicated by Subimal Ghosh

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Zhang, X., Xiao, W., Wang, Y. et al. Spatial-temporal changes in NPP and its relationship with climate factors based on sensitivity analysis in the Shiyang River Basin. J Earth Syst Sci 129, 24 (2020). https://doi.org/10.1007/s12040-019-1267-6

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  • DOI: https://doi.org/10.1007/s12040-019-1267-6

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