中国大陆植被覆盖对降水与温度变化的响应

应用GIMMS NDVI时间序列遥感数据集合中国大陆188个气象站的温度与降水资料,基于时滞互相关方法和GIS工具,利用中国生态地理区划图分析了中国大陆不同生态地理区植被NDVI的变化趋势及其与温度、降水年内变化的时滞响应及其空间特征.结果表明,1982-2000年中国大陆气温升高,降水量减少,NDVI呈现增加趋势.中温带和北亚热带植被NDVI略有减少,边缘热带、高原亚寒带和高原温带植被NDVI增加速度显著.植被NDVI与降水和温度之间有较显著的相关性.中国大陆植被NDVI对气温和降水有滞后效应,并且滞后水平存在着明显的空间差异.

Response of Vegetation Coverage to Changes of Precipitation and Temperature in Chinese Mainland

Climate changes affect the growth of vegetation and photosynthesis,which can be represented byNDVI change.It is therefore very important to investigate the relationship between NDVI and climate.NDVI values can be used to characterize earth surface conditions regarding vegetation coverage,growth,typeand other variables.The change of vegetation at Chinese mainland and its relationship with temperature andprecipitation were studied on different geographic ecological zones in China using time lag cross-correlationanalysis and GIS based on GIMMS NDVI data set along with temperature and precipitation data from 188stations in Chinese mainland.It was found that in general,the temperature of mainland China increased,theprecipitation was reduced,and the vegetation coverage increased from 1982to 2000.The NDVI values of thecold temperature zone,temperate zone,north subtropical and central asian tropical zone decreased while theNDVI values of the other five ecological geographic zones increased.There is a significant correlation between NDVI and precipitation and temperature.The NDVI values of mainland China showed substantiallyspatial variability in lagging behind the variations of precipitation and temperature.