【摘要】 青藏高原植被生态系统对全球变化的响应较为敏感。该研究引入重心模型等方法分析和探讨了2000～2015年青藏高原NPP时空变化格局及其驱动机理,并定量区分了NPP变化过程中气候变化和人类活动的相对作用。结果发现:(1)2000～2015年,青藏高原NPP年均值总体上呈现从东南向西北递减的趋势。在年际变化方面,近16年青藏高原不同生态子区的NPP均呈现不同程度的增加趋势。(2)近16年青藏高原NPP重心总体向西南方向移动,表明西南部NPP在增量和增速上大于东北部。(3)NPP与降水显著相关的区域主要位于青藏高原中部、青藏高原东南部及雅鲁藏布江流域中下游,而NPP与气温显著相关的区域主要位于藏南地区、横断山区北部、青藏高原中部和北部。(4)气候变化和人类活动在青藏高原NPP变化过程中的相对作用存在显著的时空差异性,在空间上呈现"四线-五区"的格局。研究成果可为揭示青藏高原区域生态系统对全球变化的响应机制提供理论和方法支撑。更多还原

【Abstract】 The vegetation ecosystem of the Qinghai-Tibet Plateau is very sensitive to climate change. In this study, the spatial-temporal evolution patterns of net primary production(NPP) and its driving mechanisms in the Qinghai-Tibet Plateau from 2000 to 2015 were analyzed and discussed by using the gravity center model and other relative models. Subsequently, the relative effects of climate change and human activity on the process of NPP change were quantitatively distinguished. The results have been listed.(1) From 2000 to 2015, the annual mean NPP in the Qinghai-Tibet Plateau showed a decreasing trend from southeast to northwest. In terms of interannual changes, the annual mean NPP of different subregions showed a fluctuating upward trend.(2) During the past 16 years, the gravity center of NPP in the Qinghai-Tibet Plateau moved southwest indicating that the increment and growth rate of NPP in the southwestern part were greater than those in the northeastern part.(3) The regions with significant correlation between NPP and precipitation were mainly located in the central and southeastern parts of the Qinghai-Tibet Plateau and the middle and lower reaches of the Yarlung Zangbo River Basin. The regions with significant correlation between vegetation NPP and temperature were mainly located in southern Tibet, northern Hengduan Mountains, and central and northern Qinghai-Tibet Plateau.(4) The relative effects of climate change and human activity on the process of NPP change in the Qinghai-Tibet Plateau had significant spatial-temporal differences with a spatial pattern of "four lines-five regions." The research results can provide theoretical and methodological support to reveal the response mechanism of regional ecosystems to global change in the Qinghai-Tibet Plateau.更多还原