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遥感在区域植被变化研究中具有十分重要的作用,能为大面积监测植被状况的演化过程提供技术支持。NDVI在高植被覆盖地区存在过饱和现象,对稀疏地区的植被变化尤其敏感。以古里雅冰帽南部的松木希错流域植被相对稀疏区域为研究区,基于MODIS NDVI数据和逐月气象观测数据,以及RS和GIS平台,对该区域2001～2010年主要植被变化趋势进行了初步研究,并对植被变化与气候驱动因子的关系进行了分析和探讨。结果表明:①2001～2010年间该区域的植被活动有加强趋势;②NDVI表明研究区植被生长季较短(5～9月),NDVI浮动区间为0.11～0.13,低于全国水平(0.3～0.35),也低于全球稀疏灌丛的平均水平(0.2～0.4);③NDVI与年均气温整体上呈正相关,而与年降水量相关性不强。表明近年来持续升温是影响该区域植被活动加强的最主要原因。
Remote sensing plays an important role in the study of regional vegetation change and can provide technical support for the large-scale monitoring of the evolution of vegetation status. Over-saturation of NDVI in high vegetation cover areas is particularly sensitive to vegetation changes in sparsely populated areas. Based on MODIS NDVI data and monthly meteorological observation data and RS and GIS platforms, the main vegetation change trends in 2001-2010 in this region were preliminary studied Research, and the relationship between vegetation change and climate-driven factors were analyzed and discussed. The results showed as follows: (1) Vegetation activities in this area tended to be strengthened during 2001-2010; (2) NDVI showed that the vegetation growth season was short (May-September) in the study area, and the NDVI fluctuated range was 0.11-0.13, lower than the national level (0.3-0.35) Which is also lower than the average level of global sparse thickets (0.2 ~ 0.4). ③NDVI is positively correlated with the average annual temperature, but not with the annual precipitation. This indicates that the continuous warming in recent years is the most important factor affecting the vegetation activities in this region.