河南科学
河南科學
하남과학
HENAN SCIENCE
2015年
8期
1440-1445
,共6页
植被NDVI%时空变化%豫西山地
植被NDVI%時空變化%豫西山地
식피NDVI%시공변화%예서산지
vegetation NDVI%spatial-temporal changes%Yuxi mountains
基于2000—2014年MODIS-NDVI数据以及研究区DEM数据,借助MRT,ArcGIS等软件,采用MVC法、均值法获得月均、季均以及年均NDVI数据,并采用趋势分析法研究豫西山地植被NDVI时空变化特征.研究表明:①2000—2014年豫西山地植被NDVI呈显著增长趋势,增长率为0.021/10a(P<0.05),其中秋季(0.052/10a,P<0.05)明显高于春季(0.015/10a,P>0.05),表明在全球变暖的大背景下研究区植被覆盖处于改善状态,表现为生长季延长强于生长季提前的趋势.②豫西山地大部分地区植被NDVI都在0.4~0.7之间,所占比例达到93.8%.整体来看,以伏牛山为界,研究区南部NDVI平均值高于北部,符合植被分布的纬度地带性规律.③15年来豫西山地植被NDVI变化趋势具有明显的空间差异,海拔较低处植被覆盖普遍呈增加趋势,海拔较高处表现为退化趋势.
基于2000—2014年MODIS-NDVI數據以及研究區DEM數據,藉助MRT,ArcGIS等軟件,採用MVC法、均值法穫得月均、季均以及年均NDVI數據,併採用趨勢分析法研究豫西山地植被NDVI時空變化特徵.研究錶明:①2000—2014年豫西山地植被NDVI呈顯著增長趨勢,增長率為0.021/10a(P<0.05),其中鞦季(0.052/10a,P<0.05)明顯高于春季(0.015/10a,P>0.05),錶明在全毬變暖的大揹景下研究區植被覆蓋處于改善狀態,錶現為生長季延長彊于生長季提前的趨勢.②豫西山地大部分地區植被NDVI都在0.4~0.7之間,所佔比例達到93.8%.整體來看,以伏牛山為界,研究區南部NDVI平均值高于北部,符閤植被分佈的緯度地帶性規律.③15年來豫西山地植被NDVI變化趨勢具有明顯的空間差異,海拔較低處植被覆蓋普遍呈增加趨勢,海拔較高處錶現為退化趨勢.
기우2000—2014년MODIS-NDVI수거이급연구구DEM수거,차조MRT,ArcGIS등연건,채용MVC법、균치법획득월균、계균이급년균NDVI수거,병채용추세분석법연구예서산지식피NDVI시공변화특정.연구표명:①2000—2014년예서산지식피NDVI정현저증장추세,증장솔위0.021/10a(P<0.05),기중추계(0.052/10a,P<0.05)명현고우춘계(0.015/10a,P>0.05),표명재전구변난적대배경하연구구식피복개처우개선상태,표현위생장계연장강우생장계제전적추세.②예서산지대부분지구식피NDVI도재0.4~0.7지간,소점비례체도93.8%.정체래간,이복우산위계,연구구남부NDVI평균치고우북부,부합식피분포적위도지대성규률.③15년래예서산지식피NDVI변화추세구유명현적공간차이,해발교저처식피복개보편정증가추세,해발교고처표현위퇴화추세.
Based on MODIS-NDVI data and DEM data of study area during 2000-2014,with the aid of the MRT, ArcGIS software,using MVC method,average method and trend analysis method to study the vegetation NDVI spatial-temporal variation characteristics of Yuximountain. The research shows as follows. ①During 2000-2014,the vegetation NDVI of Yuxi mountain showed a trend of significant growth,and the growth rate is 0.021/10a(P<0.05). Moreover,the autumn(0.052/10a,P<0.05)is significantly higher than the spring(0.015/10a,P>0.05). It was showed that in the context of global warming,vegetation is improven in the study area,with the improving trend that the extension of growing season is stronger than growth season in advance.②Most of the Yuxi mountains vegetation NDVI is between 0.4 to 0.7,and the proportion reached 93.8%. As a whole,with Funiu mountain as the boundary, the northern average NDVI is higher than the south in the study area,conforming to the regularity of latitude zonal vegetation distribution.③In the past 15 years,the change trend of the Yuxi mountains vegetation NDVI has obvious space difference. The vegetation coverage at the lower elevation is generally increased ,while the vegetation coverage at the high altitude has a degradation trend.