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利用青海省东部1998-2006年通过SPOT影像资料获取的NDVI值,以及该区域内13个站点的气象资料,研究了青海省东部高原以NDVI为代表的植被指数与以降水量距平百分率和综合干旱指数为代表的气象干旱指数的相关关系。研究表明:7-10月,距平NDVI与D指数的相关系数在0.2~0.8之间波动,特别是8月份的相关系数0.566和10月份的相关系数0.825均通过了α=0.05的显著性检验,说明在植被生长旺盛时期,距平NDVI与D指数具有很好的相关性。而距平NDVI与降水距平百分率的相关性较弱,只有在10月份通过了α=0.01的显著性检验。
Based on the NDVI values obtained from SPOT images from 1998 to 2006 in the eastern part of Qinghai Province and the meteorological data of 13 stations in the eastern part of Qinghai Province, the vegetation indices represented by NDVI and the percentages of anomalous precipitation and integrated drought The index represents the correlation between the meteorological drought index. The results showed that the correlation coefficient between NDVI and D index fluctuated between 0.2 and 0.8 from July to October, especially the correlation coefficient of 0.566 in August and 0.825 in October all passed the significance test of α = 0.05 , Indicating that there is a good correlation between anomalous NDVI and D index during the vegetation growth period. However, the correlation between anomalous NDVI and the percentage of precipitation anomaly is weak, and the significance test of α = 0.01 was passed only in October.