Analysis of the correlation between vegetation greenness and climate variable trends is important in the study of vegetation greenness. Our study used Normalized Difference Vegetation Index-3rd generation data from the Advanced Very High-Resolution Radiometer - Global Inventory Modeling and Mapping Studies (AVHRR-GIMMS NDVI3g), land cover data from the Climate Change Initiative (CCI-LC), and climate data from the Climatic Research Unit global time series (CRU TS) of climate variables (temperature and precipitation, solar radiation) over the past 33 years. First, we estimated the overall trends for vegetation greenness and climate variables over five time periods. Second, we subjected the data to correlation, regression, and residual analyses to detect correlations between vegetation greenness and different climate variables. Third, we extracted trends and correlation results by primary land cover types for each climate zone. Our study was focused at the global scale, and findings indicate that the largest decreasing trend of vegetation greenness and grasslands occurred in the mid-latitude regions of the Northern Hemisphere and in parts of South America, Africa, Saudi Arabia, and south and northeast Asia. In particular, the cold climatic zones of forest (36.6%), cropland (36.6%), and grassland (14.1%) suffered significant decline in vegetation greenness. Anthropogenic activities are mainly responsible for declining vegetation greenness particularly in northern Africa, central and western Asia. However, residual analysis shows an increase in vegetation greenness in some parts of western Europe, southern Australia, and the northern part of South America. The study also identified temperature and precipitation as the main factors responsible for controlling vegetation growth. Hot-spot areas with the largest temperature increases were found in the Amazon, Central America, southern Greenland, east Africa, south-east Asia, and other areas. However, temperatures decreased in the western part of South America, Angola, the Philippines, Indonesia, and Papua New Guinea. Precipitation decreased the most from March to May over most parts of the world with high correlation (r = 0.88) in Russia Canada, northeast Asia, and central Africa. In general, climate factors were the principal drivers of the variation in vegetation greenness globally in recent years.

分析植被绿色度与气候变化趋势之间的相关性对研究植被绿色度具有重要意义。我们的研究使用了先进的甚高分辨率辐射计-全球清单建模和制图研究（AVHRR-GIMMS NDVI3g）的第三代归一化植被指数，气候变化倡议（CCI-LC）的土地覆盖数据以及气候数据来自气候研究部门过去33年的全球气候变量（温度和降水，太阳辐射）时间序列（CRU TS）。首先，我们估算了五个时段内植被绿色度和气候变量的总体趋势。其次，我们对数据进行了相关，回归和残差分析，以检测植被绿色度与不同气候变量之间的相关性。第三，我们根据主要气候类型的主要土地覆盖类型提取了趋势和相关结果。我们的研究集中在全球范围，研究结果表明，植被绿色度和草地的最大下降趋势发生在北半球的中纬度地区以及南美，非洲，沙特阿拉伯以及南亚和东北亚的部分地区。尤其是森林（36.6％），农田（36.6％）和草地（14.1％）的寒冷气候区植被绿度明显下降。人为活动主要是造成植被绿色度下降的原因，特别是在北部非洲，中亚和西亚。但是，残留分析表明，在西欧，澳大利亚南部和南美北部的某些地区，植被的绿色度有所提高。研究还确定了温度和降水是控制植被生长的主要因素。在亚马逊地区，中美洲，格陵兰南部，东非，东南亚和其他地区发现了温度上升幅度最大的热点地区。但是，南美洲西部，安哥拉，菲律宾，印度尼西亚和巴布亚新几内亚的气温下降。在俄罗斯，加拿大，东北亚和中部非洲，三月至五月期间，世界大部分地区的降水减少最多（r = 0.88）。总体而言，气候因素是近年来全球植被绿色度变化的主要驱动力。在亚马逊地区，中美洲，格陵兰南部，东非，东南亚和其他地区发现了温度上升幅度最大的热点地区。但是，南美洲西部，安哥拉，菲律宾，印度尼西亚和巴布亚新几内亚的气温下降。在俄罗斯，加拿大，东北亚和中部非洲，三月至五月期间，世界大部分地区的降水减少最多（r = 0.88）。总体而言，气候因素是近年来全球植被绿色度变化的主要驱动力。在亚马逊地区，中美洲，格陵兰南部，东非，东南亚和其他地区发现了温度上升幅度最大的热点地区。但是，南美洲西部，安哥拉，菲律宾，印度尼西亚和巴布亚新几内亚的气温下降。在俄罗斯，加拿大，东北亚和中部非洲，三月至五月期间，世界大部分地区的降水减少最多（r = 0.88）。总体而言，气候因素是近年来全球植被绿色度变化的主要驱动力。在俄罗斯，加拿大，东北亚和中部非洲，三月至五月期间，世界大部分地区的降水减少最多（r = 0.88）。总体而言，气候因素是近年来全球植被绿色度变化的主要驱动力。在俄罗斯，加拿大，东北亚和中部非洲，三月至五月期间，世界大部分地区的降水减少最多（r = 0.88）。总体而言，气候因素是近年来全球植被绿色度变化的主要驱动力。