基于NDVI的干旱区绿洲植被覆盖度动态变化分析——以新疆阿克苏地区为例  

Analysis of Vegetation Coverage Dynamic Change in Typical Oasis of Arid Areas Based on NDVI——A Case study of Aksu Region in Xinjiang

作　　者：段峥嵘[1] 祖拜代.木依布拉 夏建新[1] DUAN Zheng-rong;ZUBAIDAI.Muyibula;XIA Jian-xing(College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China)

机构地区：[1]中央民族大学生命与环境科学学院,北京100081

出　　处：《中央民族大学学报（自然科学版）》2018年第2期5-14,共10页Journal of Minzu University of China(Natural Sciences Edition)

摘　　要：本文以新疆阿克苏地区1991年、2001年和2016年TM/ETM+/OLI遥感影像为数据源,基于归一化植被指数NDVI应用像元二分模型对植被覆盖度进行了估算,得到三期植被覆盖度等级分布图,并通过转移矩阵,对研究区植被覆盖的时空变化特征进行了分析.结果表明,近25年来,阿克苏地区植被覆盖度总体呈现增长趋势,植被覆盖度60%以上的高植被覆盖区域面积显著增加,面积占比由1991年的7%上升至2016年的12.33%,而其他植被覆盖等级区域的面积均呈减少趋势.自然因素尤其是气候变化在一定程度上有利于研究区植被覆盖的增加,但短期内植被覆盖变化的主导因素还是人类活动的干扰.The three periods of remote sensing images of TM/ETM ＋/OLI in Aksu, Xinjiang (1991, 2001 and 2016） were taken as data sources. The vegetation fractional coverage distribution maps in those three periods were calculated by conducting the pixel dichotomy model using NDVI （Normalized Differential Vegetation Index）. Further, the temporal and spatial variation characteris-tics of vegetation coverage in the study area were analyzed through transition matrix. The results showed that the vegetation coverage in Aksu had demonstrated a growth trend in recent 25 years; the area whose vegetation coverage is 60% or higher had remarkably grown, and the percent age of area increased from 7% in 1991 to 12.33% in 2016. At the same time, other areas, in which vegetation coverage is lower than 60% , had all demonstrated a decreasing trend. To a certain extent, natural factors, especially climate change, contribute to the increase of vegetation coverage in the study area. Nevertheless, the dominant factor of the vegetation coverage change is still the interference of human activities in short period.

关 键 词：归一化植被指数NDVI 植被覆盖度 NDVI差值 阿克苏地区 

分 类 号：Q948[生物学—植物学]