晋城市植被覆盖时空变化与地形效应耦合

Spatial and Temporal Dynamics of Vegetation Cover and Its Influencing Factors in Jincheng Area

植被作为生态系统的基础,是生态循环系统中重要的研究对象,位于黄土丘陵南部的晋城盆地,由于其特殊的地形地貌特征,植被对环境变化极为敏感。基于2006—2015年MOD13的NDVI植被数据和DEM数据,本文选取山西省晋城市作为研究区,获取植被覆盖度的时间序列数据、晋城行政区县界矢量数据,对其数据进行趋势分析和稳定性分析,运用转移矩阵对晋城市植被覆盖的时空变化特征及其与地形因子耦合。结果表明:1)晋城市2006—2015年的植被覆盖度是轻微增长的,其中以高植被覆盖度分布为主,主要围绕在陵川、泽州、阳城和沁水的周边;2)依据晋城市植被覆盖度的标准差,可以得出晋城市植被覆盖度的离散程度低、变化小、稳定性高;3)在不同的地形因子下,相比于坡向,高程和坡度对植被覆盖度的影响更为明显。

As the foundation of the ecosystem,vegetation not only plays an important role in the ecological circulatory system,but also has a great significance in the study of the ecological environment.This paper takes the Jincheng city of Shanxi Province as the research area.Based on the NDVI vegetation data of MOD13 from 2006 to 2015,we obtain vegetation cover time series data,with the data of vector and DEM.We conduct trend and overlay analysis of vegetation coverage data and analyze its spatial and temporal changes and impact factors through the transfer matrix.The results showed that:(1)the vegetation coverage in Jincheng City increased slightly from 2006 to 2015;and the type of vegetation coverage was high vegetation,which mainly centered on the surrounding areas of Lingchuan,Zezhou,Yangcheng and Qinshui;(2)according to the standard deviation of vegetation coverage in Jincheng City,we can be known that the time series of vegetation coverage in Jincheng City has low dispersion,small changes,and high stability;(3)under different terrain factors,it has a great influence on elevation and slope on,but little influence on slope direction.