内蒙古草地NPP变化特征及其对气候变化敏感性的CENTURY模拟研究

发布时间：2018-05-21 00:29

本文选题：气候变化 + 草地　；参考：《地理研究》2016年02期

【摘要】：气候变化及其对植被净初级生产力的影响是全球变化研究的核心内容之一。基于空间化的CENTURY生物过程模型,分析1981-2010年内蒙古草地净初级生产力(NPP)的时空演变规律及其对关键气候因子的敏感性特征。结果表明:近30年内蒙古草地大部分区域NPP呈下降态势但趋势并不显著,全区平均降速约为1.17 g C/m2?a;NPP年代际变化时空差异较大,1980s至1990s约69.65%的区域NPP下降,1990s至2000s NPP下降加剧,下降面积较前者扩大了17.50%;NPP对降水与温度的敏感性特征空间异质性较强,但总体上区域降水减少可能是近30年内蒙古草地NPP下降的主要因素,温度升高同样会导致草地NPP下降,但作用程度较小。
[Abstract]:Climate change and its impact on net primary productivity of vegetation is one of the core contents of global change research. Based on the spatialized CENTURY biological process model, the temporal and spatial evolution of the grassland net primary productivity (NPP) in Inner Mongolia from 1981 to 2010 and its sensitivity to key climatic factors were analyzed. The results showed that the NPP of most regions of Inner Mongolia grassland showed a decreasing trend in the past 30 years, but the trend was not significant. The average decreasing rate of NPP in the whole region was about 1.17 g / m ~ (2) C / m ~ (2). There was a great spatial and temporal difference in the decadal variation of NPP. The decrease of NPP in the region from 1980 to 1990 was increased, and the decrease of NPP from 1990 to 2000 was intensified. Compared with the former, the decreasing area increased the spatial heterogeneity of sensitivity between precipitation and temperature, but the decrease of regional precipitation may be the main factor of the decrease of NPP in Inner Mongolia grassland in the past 30 years, and the increase of temperature will also lead to the decrease of NPP in Inner Mongolia grassland. But the degree of action is small.
【作者单位】：河南理工大学测绘与国土信息工程学院;中国科学院地理科学与资源研究所;中国科学院陆地表层格局与模拟重点实验室;
【基金】：国家十二五科技支撑计划(2012BAC19B04;2012BAC19B10) 国家重点基础研究发展计划(973计划)(2011CB403206)
【分类号】：S812

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