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首页> 外文期刊>Chinese science bulletin >Spatiotemporal vegetation cover variations in the Qinghai-Tibet Plateau under global climate change
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Spatiotemporal vegetation cover variations in the Qinghai-Tibet Plateau under global climate change

机译：全球气候变化下青藏高原的时空植被覆盖变化

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摘要

Empirical Orthogonal Function (EOF) analysis and the related Principal Components (PC) analysis are used to extract valuable vegetation cover derived information from the National Oceanic and Atmospheric Administration (NOAA-AVHRR)'s Leaf Area Index (LAI) satellite images. Results suggest that from 1982 to 2000 global climate change has contributed to an increase in vegetation cover in the Qinghai-Tibet Plateau. The correlation between rainfall and LAI EOF PC1 and PC2 indicates that rainfall is the major climatic factor influencing interannual variations of average vegetation cover throughout the entire Plateau. However, annual mean vegetation cover trends in the Qinghai-Tibet Plateau are mainly out of phase with air temperature increasing, which is primarily responsible for nonsynchronous changes of vegetation cover. In the southern ridge of the Qinghai-Tibet Plateau, recent warming trends contribute to humid weather and favorable conditions for vegetation growth. By contrast, higher temperatures have led to arid conditions and insufficient rainfall in the northern part of the Plateau, leading to drought and other climatic conditions which are not conducive to increased vegetation cover.
机译：经验正交函数（EOF）分析和相关的主成分（PC）分析用于从国家海洋和大气管理局（NOAA-AVHRR）的叶面积指数（LAI）卫星图像中提取有价值的植被覆盖信息。结果表明，从1982年到2000年，全球气候变化导致了青藏高原植被的增加。降雨与LAI EOF PC1和PC2之间的相关性表明，降雨是影响整个高原地区平均植被覆盖率年际变化的主要气候因子。然而，青藏高原的年平均植被覆盖趋势主要是随着气温的升高而异相，这是造成植被覆盖非同步变化的主要原因。在青藏高原的南部山脊，最近的变暖趋势有助于潮湿的天气和有利的植被生长条件。相反，较高的温度导致高原北部的干旱条件和降雨不足，从而导致干旱和其他气候条件，不利于增加植被覆盖。

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