乌鲁木齐地区生长季NDVI序列影像的植被覆盖变化分析  

An Analysis of the Vegetation Coverage in the Growing Season of Urumqi Reflected from NDVI Serial Image

作　　者：熊玲 殷克勤 吴麟 黄慰军[1,2] 

机构地区：[1]乌鲁木齐气象卫星地面站,新疆乌鲁木齐830011 [2]新疆气候中心,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2011年第6期54-58,共5页Desert and Oasis Meteorology

基　　金：气象关键技术集成与应用(CMAGJ2011M59);中国沙漠气象研究基金(sqj2007007)

摘　　要：应用EOS／MODIS—Terra卫星数据，按照NDVI（归一化植被指数）最大值合成法计算了乌鲁木齐地区2007、2010年生长季逐旬植被NDVI序列，得到植被长势演变图和植被指数分布基础数据，结合气象资料和南山中山带牧草监测站实测数据，分析了NDVI在乌鲁木齐地区的变化特点及其与气候因子的关系。结果表明：气温、降水是NDVI变化的主要驱动因子，但植被对于气候因子的响应普遍存在滞后性。乌鲁木齐地区NDVI旬最大值总体变化在0．46～0．83范围内。与近10a中植被长势最好的2007年同期数据比较，2010年春季植被指数比2007年推迟4旬达到0．7以上，表明植被发育期比2007年推迟10～15d；秋季植被指数7月中旬就出现下降拐点，表明植被发育期比2007年提前4旬进入种子成熟、黄枯期或停止生长。以上结论与南山中山带牧草监测站实测结果相符。By use of satellite data （MODIS） and meteorological data from Pasture Monitoring Station in Urumqi, the NDVI （normalized difference vegetation index） sequence of every 10 days in the growing seasons of 2007 and 2010 in Urumqi was calculated by the method of the maximum synthesis. NDVI variation characteristics and its relationship with meteorological factors were also analyzed. The results showed that： temperature and precipitation are the main driving factors for NDVI change, but hysteresis exists for the response of vegetation to climate factors. The maximum NDVI values of 10 days change during range of 0.46 to 0.83 in Urumqi area. Compared with contemporanceous data in 2007 when the vegetation growth was the best in the past 10 years , the growth period in 2010 was 10-15 days later and vegetation index reach 0.7 till 40 days later because of lower temperature in spring of 2010. As high temperature and less precipitation,vegetation index appeared drop inflexion point in the mid of July, and the grass went into the period of maturity, wilting or stopping growth,which is 40 days earlier than that in 2007. These conclusions matched the measuring results of the pasture monitoring station in the middle belt of Nanshan Hill in Urumqi area.

关 键 词：NDVI(归一化植被指数) MODIS 覆盖度 乌鲁木齐地区 

分 类 号：P407[天文地球—大气科学及气象学]