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Quantitative analysis of the contributions of climatic and human factors to grassland productivity in northern China

机译：中国北方草地生产力对气候与人类因素贡献的定量分析

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摘要

An accurate quantitative analysis of the contributions of climate change (CC) and human activities (HA) to grassland productivity is crucial for elucidating the relevant driving mechanisms. In this study, grassland in northern China was analyzed. We chose the net primary productivity (NPP) as an evaluation indicator of grassland productivity and identified the relative roles of climatic and human factors in NPP changes. A quantitative method based on partial derivatives was used for evaluating the contributions of climatic factors to NPP changes, and the difference between the inter-annual variation rate of NPP and climatic factors contribution was considered as the HA contribution. Then, different scenarios were designed to evaluate the relative contribution proportions of CC and HA to grassland restoration and degradation. The results revealed that the average grassland NPP over northern China showed a significant increasing trend at a rate of 1.66 g Cm-2 year(-1) from 2000 to 2015. The contributions of temperature, precipitation, and solar radiation to grassland NPP changes were 0.06, 0.50, and 0.52 g Cm-2 year(-1), respectively. Solar radiation made the greatest positive contribution among all of the climatic factors, followed by precipitation. The contributions of CC and HA to grassland NPP changes were 1.08 and 0.58 g Cm-2 year(-1), respectively. Moreover, the role of HA in both grassland restoration and degradation was larger than that of CC. Overall, the positive effect of HA on grassland productivity may be greatly offset by its negative effect, and therefore the positive contribution of HA to grassland NPP changes was less than that of CC. Thus, the effective measures and policies used to control grassland degradation should be further strengthened to protect grassland resources.
机译：对气候变化贡献（CC）和人类活动（HA）对草地生产力的准确定量分析至关重要，以阐明相关的驱动机制。在这项研究中，中国北方的草地进行了分析。我们选择净初级生产力（NPP）作为草原生产力的评估指标，并确定了气候和人为因素在NPP变化中的相对作用。基于部分衍生物的定量方法用于评估气候因素对NPP变化的贡献，并且核准NPP年间变异率与气候因素贡献之间的差异被视为公顷贡献。然后，旨在评估CC和HA到草地修复和降解的相对贡献比例。结果表明，中国北方的平均草原NPP以2000年至2015年的1.66克CM-2年（-1）率为1.66克CM-2年（-1）的显着增加趋势。温度，降水和太阳辐射对草地NPP变化的贡献0.06,0.50和0.52g cm-2年（-1）。太阳辐射为所有气候因素之间做出了最大的积极贡献，然后是降水。 CC和HA对草地NPP的贡献分别为1.08和0.58克CM-2年（-1）。此外，HA在草地修复和降解中的作用大于CC的作用。总的来说，HA对草地生产力的积极作用可能会因其负面影响而大大抵消，因此HA对草地NPP变化的积极贡献小于CC。因此，应进一步加强控制草地退化的有效措施和政策以保护草原资源。

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  • 来源
    《Ecological indicators》 |2019年第8期|542-553|共12页
  • 作者

    Yan Yuchao; Liu Xiaoping; Wen Youyue; Ou Jinpei;

  • 作者单位

    Sun Yat Sen Univ Sch Geog & Planning Guangdong Key Lab Urbanizat & Geosimulat Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Geog & Planning Guangdong Key Lab Urbanizat & Geosimulat Guangzhou 510275 Guangdong Peoples R China;

    South China Inst Environm Sci MEP 18 Ruihe RD Guangzhou 510535 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Geog & Planning Guangdong Key Lab Urbanizat & Geosimulat Guangzhou 510275 Guangdong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Climate change; Human activities; Grassland productivity; NPP; Quantitative analysis;

    机译：气候变化;人类活动;草地生产力;NPP;定量分析;

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