陇东地区植被指数NDVI与降水的关系研究  

Study on correlation between NDVI and precipitation in Longdong

作　　者：梁芸[1,2] 金文岩 郭铌[1] 刘世祥[4] 韩涛 

机构地区：[1]甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730020 [2]兰州区域气候中心,甘肃兰州730020 [3]普兰店市气象局,辽宁普兰店116200 [4]兰州中心气象台,甘肃兰州730020

出　　处：《干旱地区农业研究》2009年第6期247-251,共5页Agricultural Research in the Arid Areas

基　　金：兰州干旱气象研究所干旱气象科学研究基金(IAM200815);甘肃省气象局科研项目(2008-08)

摘　　要：利用1982-2003年NOAA/AVHRR（advanced very high resolution rediometer）资料及同期的降水资料,对甘肃省陇东地区半干旱区环县和半湿润区西峰的植被指数NDVI与不同时间尺度的标准化降水指数SPI进行相关分析。结果表明：在植被生长季,植被对降水的敏感程度半干旱区大于半湿润区;大多数月NDVI与3-SPI的相关系数较高,而与1-SPI较低;半干旱区和半湿润区NDVI的年变化幅度分别为：-12%-10%和-10%-13%,半干旱区NDVI的年变化与SPI变化趋势吻合较好,显著相关（P〈0.05）,而在半湿润区二者并不显著;半干旱区的年NDVI与四季降水均显著相关（P〈0.05）,而半湿润区年NDVI只与冬春季的降水显著相关（P〈0.05）。Normalized difference vegetation index（NDVI） can be characterized as an indicator of vegetable growing conditions while precipitation resources is a key factor to affect the vegetable growing conditions and ecological construction in Longdong of Gansu.The correlation between NDVI and different-temporal-scale standard precipitation index（SPI） in Longdong of Gansu are studied based on the data of NOAA/AVHRR and precipitation over the same period in 1982～2003.The results show：（1） The sensitivity of vegetable to precipitation is more significant to semi-arid area than semi-humid area in vegetable growing season;（2） The most significant correlation is found in NDVI and 3-SPI while the most insignificant is in NDVI and 1-SPI;（3） The annual-variational amplitudes of NDVIs are-12%～10% in semi-arid area and-10%～13% in semi-humid area,respectively,which agree well with SPI in the former at 95% significant level（P〈0.05）,but not significant in the latter;（4） Annual NDVIs are significantly correlated with the precipitations of four seasons in arid area（P〈0.05） while significant only in winter and spring in semi-humid area.

关 键 词：植被指数 标准化降水指数 陇东 

分 类 号：S161.6[农业科学—农业气象学]