Vegetation net primary productivity and its response to climate change during 2001-2008 in the Tibetan Plateau
Vegetation net primary productivity and its response to climate change during 2001-2008 in the Tibetan Plateau
复制标题
2001-2008年青藏高原植被净初级生产力及其对气候变化的响应
DOI：
10.1016/j.scitotenv.2012.12.014
复制
发表时间：
2013-02-01
影响因子：
9.8
通讯作者：
Qu, Ran
中科院分区：
文献类型：
--
作者：
Gao, Yanhua;Zhou, Xu;Qu, Ran
高山生态系统对全球气候变化高度敏感。青藏高原是全球气候变化最敏感的地区之一。气温升高和降水变化会影响高原的生态系统生产力。净第一性生产力(NPP)是陆地生态系统碳循环中最重要的因素之一。利用光能利用效率模型估算了青藏高原的净第一性生产力。该模型基于1公里×1公里的植被类型分辨率图、多时相500米分辨率的MODIS数据和逐日气象数据。分析了2001~2008年年净初级生产力的空间分布格局和动态变化。然后，分析了净初级生产力对温度和降水变化的响应。结果表明，青藏高原高山生态系统年平均净初级生产力为0.472 pgC，受温度和降水变化的综合影响，净初级生产力具有明显的季节和年际变化。最后，为了分析气温和降水对净初级生产力年际变化的影响，计算了温度、降水与净初级生产力的相关系数。结果表明，青藏高原地区气温、降水与净初级生产力的关系是不同的。年平均气温升高对植被净初级生产力有显著正向影响(R2=0.83)。而年降水量变化对植被净初级生产力的影响较小(R2=0373)。(C)2012爱思唯尔B.V.保留所有权利。
Alpine ecosystems are highly sensitive to global climate changes. The Tibetan Plateau is one of the areas that are most sensitive to global climate change. Increases in temperature and changes in precipitation can impact the plateau's ecosystem productivity. Net primary productivity (NPP) is one of the most important factors in the carbon cycle of terrestrial ecosystems. In this paper, a light-use-efficiency model was used to estimate the net primary productivity in the Tibetan Plateau. The model is based on a 1-kmx1-km-resolution map of vegetation type, multi-temporal 500-m-resolution MODIS data and daily meteorological data. The spatial distribution pattern and dynamic change of the annual NPP from 2001 to 2008 are analyzed. Then, we analyzed the response of the NPP to temperature and precipitation changes. The results show that the mean annual NPP of alpine ecosystems in the Tibetan Plateau is equal to 0.472 Pg C and that the NPP exhibits significant seasonal and interannual variation due to the combined effects of temperature and precipitation changes. Finally, to analyze the effect of temperature and precipitation on the inter-annual change of the NPP, the correlation coefficient between temperature, precipitation and the NPP was computed. It was found that the relations among air temperature, precipitation and the NPP in the Tibetan Plateau region are different. The annual average temperature increase had a significantly positive effect on the vegetation NPP (R-2=0.83). In contrast, the annual precipitation changes had a weakly negative effect on the vegetation NPP (R-2=0373). (C) 2012 Elsevier B.V. All rights reserved.