2000～2008年中国东北样带植被变化  

VEGETATION CHANGES IN NORTH EAST CHINA TRANSECT DURING 2000～2008 OBTAINED BY MODIS-NDVI

作　　者：曹云锋[1,2] 王正兴[1] 柯灵红[1,2] 张景[2] 

机构地区：[1]中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室,资源环境科学数据中心,北京100101 [2]中国科学院研究生院,北京100049

出　　处：《第四纪研究》2010年第3期531-539,共9页Quaternary Sciences

基　　金：中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室自主研究课题“MODIS植被指数质量改进关键问题研究”(批准号:066J0108SY)资助

摘　　要：利用经过重建后的2000～2008年生长季MODIS-NDVI时间序列逐年生长季均值对中国东北样带植被覆盖变化进行了研究,发现植被NDVI变化过程具有明显的时空分异特征。在时间上,2001年与2002年NDVI均值比2000～2008年9年均值分别偏低1.89%和1.44%,而2003年和2008年分别偏高2.92%和2.87%。在空间上,样带东部半湿润地区植被覆盖在2000～2008年间年际变化很小,NDVI波动在2%以下。样带中部半干旱区NDVI波动一般低于5%。而样带西部干旱的草原和荒漠化草原区植被覆盖波动明显,NDVI波动于2003年和2008年分别出现了8.51%和6.35%高值,裸地甚至于2003年出现了高达15.07%的波动。研究区NDVI变化的时空分异特征,对遥感研究和生产实践有重要意义。一方面,在进行陆地生态系统变化监测时,不能用少数几次的监测结果预测变化趋势,这对"高空间分辨率-低时间分辨率"遥感数据应用有重要意义;另一方面,NDVI波动的空间差异,要求在变化监测时把重点放在NDVI波动频繁的地区。The present paper analyzed vegetation changes in the North East China Transect（NECT） during 2000 ～2008 by averages of 16-Day,250m MODIS-NDVI time serials of growing seasons. MODIS-NDVI were preprocessed using the asymmetric Gaussians algorithm to eliminate noises resulted from mixed clouds, shadows, and aerosols. An average NDVI was calculated for each growing season during 2000 ～ 2008. Such averages together with land cover maps form the base for analysis of NDVI temporal-spatial dynamics in NECT. Comparative analyses show that NDVI anomalies were obvious in some areas and times. Temporally,NDVIs in 2001 and 2002 were obviously lower than the average and their anomalies were -1.89% and -1.44% ,respectively. On the other hand, NDVIs in 2003 and 2008 were higher than the average and their anomalies were 2.92% and 2.87% of the average, respectively. Spatially, NDVI anomalies were very small in the semi-humid eastern part of NECT, and most were within 2%. But in the semi-arid and arid western part, NDVI anomalies were remarkable; for example,the relative NDVI anomaly was 8.51% of the average for grasslands in 2003,6. 35% for sparse vegetation in 2008 ,and even 15.07% for bare land in 2003. The relative NDVI anomalies in the central part were between these anomalies. The NDVI temporal and spatial changes indicate that no trend should be concluded merely from a short period time and that further investigation should use higher spatial resolution data and should focus on more frequently changing areas of NDVI.

关 键 词：植被指数 时间序列 变化 东北样带 

分 类 号：P69[天文地球—地质学] Q948[生物学—植物学]