基于MODIS-NDVI的陕西省植被覆盖变化特征

Characteristics of Vegetation Coverage Change in Shaanxi: Based on MODIS-NDVI

为实现人地关系协调发展,为陕西省生态建设政策的制定和实施提供理论依据,本研究基于MODIS-NDVI影像及高程数据,采用MVC、一元线性回归等方法,分析陕西省2011—2015年NDVI的时空变化特征。结果表明:(1)陕西省NDVI值呈现"南高北低"的分布特征,陕南地区及陕北南部森林植被茂密,植被覆盖情况较好,陕北北部属于风沙区,植被覆盖情况较差,关中地区以农作物为主,植被覆盖情况居中;(2)2011—2015年陕西省NDVI值呈波动变化,整体变化趋于稳定,且有好转趋势,主要分布在关中及陕南地区;陕北地区NDVI值有退化迹象;(3)随着海拔高度的增加,NDVI值呈"降低—升高—降低"的变化,2000~2500 m海拔高度范围内的NDVI值最高,植被覆盖情况较好,主要是分布在秦岭山脉的太白山地区。

To realize the harmonious development of human and land, and provide a reference for formulationand implementation of ecological construction policy in Shaanxi, based on MODIS-NDVI image and altitudedata, the author analyzed the spatio-temporal variation characteristics of NDVI in Shaanxi from 2011 to 2015 by using MVC and linear regression. The results showed that：（1） the distribution of NDVI in Shaanxi wascharacterized by＂high south and low north＂; the forest vegetation was thick in southern Shaanxi, as well as inthe south area of northern Shaanxi; the vegetation coverage was poor in the north area of northern Shaanxi,which belonged to sandy area; the vegetation coverage was medium in Guanzhong region, which was mainlydominated by crops;（2） from 2011 to 2015, the NDVI value in Shaanxi fluctuated, the overall change tended tobe stable and the trend was improving, mainly in Guanzhong and southern Shaanxi; the NDVI value in northernShaanxi showed signs of degradation;（3） with the increase of altitude, the NDVI value presented a change of＂decrease-increase-decrease＂. NDVI value was the highest in the range of 2000-2500 m where the vegetationcoverage was better, mainly distributed in Taibai mountain area of Qinling mountains.