【摘要】 采用季节指数方法对MODIS-NDVI数据进行时序分析,以塔里木河下游为试验区开展生态环境遥感监测应用研究,对塔河下游2005年第秋季生态输水效应进行定量化评价:与2001年相比,此次输水改善了下游区域总体生态状况,距河道3 km内NDVI平均波动在0.7~0.85左右;而各河段区的生态改善程度因地而异,下游上段NDVI变异函数变程为0.65 km,后段为0.4 km;同时发现输水对植被物候历有16天的滞后作用;另外,输水后16天旱区植被状况最佳,输水后32天下游生态整体改善最为明显。利用NDVI时间序列可以对生态输水效应进行评估,然而NDVI空间变化与输水过程中地下水位抬升变化的相关关系需要进一步研究。更多还原

【Abstract】 Time series(TS) method on remote sensing become a powerful tool on many fields nowadays.MODIS NDVI product shows a prominent applied prospect on arid area environment study.In this paper,variogram based on MODIS-NDVI is calculated and seasonal index is built for TS analysis on 2005 for ecological environment monitoring of lower reaches Tarim River,evaluating the effects of 7th autumn ecologic water conveyance.In contrast with 2001’s,ecological status on lower reaches improved greatly owing to water conveyance,NDVI fluctuate between 0.7-0.85 at 3 km on fore parts,and 0.4 on back parts.Meanwhile,16-days delay in vegetation phenological calendar is found because of water conveyance,vegetation status tended to peak on 16 days after conveyance,and whole environment condition reached highpoint at 32 days after water conveyance.The result is in accord with ecological experiments on the spot at most parts.Based on MODIS-NDVI,TS method is a feasible way to monitor the ecological environment in arid area.And the paper also acknowledged that with the help of ecological knowledge,the method can be much more precise.更多还原