2000—2009年黄土高原地区植被覆盖度时空变化  

Changes of Vegetation Coverage in the Loess Plateau in 2000-2009

作　　者：刘宪锋[1] 杨勇[2] 任志远[1] 林志慧[1] 

机构地区：[1]陕西师范大学旅游与环境学院,陕西西安710062 [2]河南财经政法大学资源与环境学院,河南郑州450002

出　　处：《中国沙漠》2013年第4期1244-1249,共6页Journal of Desert Research

基　　金：国家自然科学基金项目(41071057);教育部人文社会科学重点研究基地重大项目(2009JJD770025)资助

摘　　要：以MODIS NDVI为数据源,应用像元二分模型对黄土高原地区近2000—2009年植被覆盖度时空变化进行分析,并从气候变化和人类活动两个方面对植被覆盖度变化的原因进行探讨。结果表明:2000—2009年黄土高原地区植被覆盖度整体呈增加趋势,年增速为0.6%(p<0.01);在空间上,黄土高原地区植被覆盖度整体呈现由西北向东南逐渐增加的趋势,这与黄土高原地区的水热条件分布基本一致;植被覆盖度明显改善地区的面积为6 717.35km2,主要分布在陕西延安的北部以及榆林的东北部;一般改善地区面积为180 176.90km2;一般恶化地区面积为27 236.37km2;明显恶化地区面积为852.62km2,主要分布在内蒙古河套平原、银川、西安以及太原等地区;气温、降水的增加以及"三北"防护林和陕北地区退耕还林(草)等工程的实施是该地区植被覆盖度增加的主要原因。Based on MODISNDVI data from 2000 to 2009,dimidiate pixel principle was applied to monitor the spatial and temporal variations of vegetation coverage（VC） in the Loess Plateau as well as the influence factors of climate change and human activity on vegetation coverage change.The results showed that the VC increased in the Loess Plateau during 2000-2009 with a growth rate of 6% per decade at significant level of α=0.01.In the space,the VC presented a worsen trend from southeast to northwest,which was in accordance with the distribution of water-heat conditions in the Loess Plateau.The areas of obviously improved region,generally improved region,general deterioration region and significant deterioration region were respectively 6 717.35 km2,18 0176.90 km2,27 236.37 km2 and 852.62 km2 from 2000 to 2009.The obviously improved regions were mainly distributed in North Shaanxi Province,while the significant deterioration regions were mainly in Yinchuan,Xi＇an and Taiyuan.The main natural factors and human factors on the VC increase were the increase of temperature and precipitation and the implementation of the project of Converting Cropland to Forest in the Three-North Regions of China.

关 键 词：黄土高原 植被覆盖度 像元二分原理 时空变化 

分 类 号：Q948[生物学—植物学]