白城市地表植被与气候因子的相关性研究

Study of correlation between NDVI and principal climate factors in Baicheng Area

运用归一化植被指数（NDVI）数据集和白城地区5个气象站点的气候资料，分析了1998，2008年白城地区植被变化状况以及NDVI与主要气候因子的相互关系。结果表明：①11a来白城地区生长季NDVI总体呈现上升趋势；②在研究区域内的月最低温度对植被生长具有重要的意义。研究区5月、9月的NDVI与同期月最低温度相关系数为0．5291、0．4460，相关显著（P〈0．05）；③气象因子与地表植被的滞后相关性因月份而有差异。5月份的降水和月最高气温等气象因子与6月份植被生长状况的相关性都很显著．分别为0．5994．-0．6068。

The article based on the time-series data of NDVI and the region＇s climate data of 5 standard meteorological stations in Baicheng, analyzed the change of the vegetation which across from 1998 to 2008, and the correlation between NDVI and principal climate factors in Baicheng area. The results show that： The vegetation change of the growing season showed an upward trend in overall. It is an important factor for the Monthly minimum temperature, significantly, to affect the vegetation growth. The significantly values of the correlation coeffi cient between NDVI as the same period data, and the monthly minimum temperature, were 0.5291 in May, and 0.4460 in September. There are differences for the lags behind correlation to according to monthly change. The correlation between the climate factors included precipitation, monthly maximum temperature in May, and the vegetation growth status in June, is significant.