黄土高原区植被恢复的空间差异性分析  

Spatial variability of vegetation restoration on the Loess Plateau based on MODIS / NDVI

作　　者：何远梅[1] 姚文俊[1] 张岩[1] 李镇[1] 朱清科[1] 

机构地区：[1]北京林业大学,水土保持与荒漠化教育部重点实验室,北京100083

出　　处：《中国水土保持科学》2015年第2期63-69,共7页Science of Soil and Water Conservation

基　　金：国家自然科学基金“黄土丘陵区退耕还林对切沟发育和侵蚀过程的影响机制”(41271301)

摘　　要：为了探究黄土高原区植被覆盖的空间分布特征、不同退耕坡度区域和不同气候带区域植被恢复程度,采用黄土高原区2000—2013年的MODIS/NDVI数据进行分析。结果表明：1）2000—2013年黄土高原区的归一化植被指数均值从东南向西北逐渐递减,呈3条带状：〈0.2、≥0.2-0.4、≥0.4,大致对应于中国农业气候分区的干旱中温带、中温带、南温带3个气候区。2）2000—2013年黄土高原区植被覆盖呈增加趋势,增加区域的面积比例超过88%,且夏季比年均表现更明显。50%以上区域年均植被覆盖呈现中度改善或明显改善,50%区域上夏季植被覆盖明显改善。3）黄土高原区中温带的年均植被覆盖呈中度改善趋势,夏季植被覆盖呈明显改善趋势;干旱中温带、南温带的年均植被覆盖处于轻微改善状态,夏季植被覆盖以中度改善和轻微改善为主。4）≥15°-25°的坡度区域,植被恢复效果都好于其他坡度条件,夏季明显改善和中度改善的面积比例超过60%,年均也超过40%;坡度〈6°或≥35°的区域,年均植被覆盖基本不变和退化面积比例接近20%。For the purpose of investigating spatial variability of vegetation cover and the effectiveness of vegetation restoration on the Loess Plateau,MODIS / NDVI data during 2000-2013 were analyzed. The results were as follows： 1） The NDVI increased from northwest to southeast of the Loess Plateau,showing obviously three zones： 0. 2,≥0. 2-0. 4,and ≥0. 4,which were roughly consistent with the drought mid temperate zone,the mid temperate zone and the south temperate zone. 2） NDVI increased on 88%of the Loess Plateau area,particularly in the summer season. Moderate and obvious improvements of annual average NDVI were found in about 50% of the area,and obvious improvement of summer season NDVI was found in about 50% of the area. 3） The average annual NDVI was moderately improved and the summer NDVI showed obvious improvements in the mid temperate zone. The average annual NDVI was in a state of slight improvement and the summer NDVI was characterized by moderate and slight improvements. 4） On the slope of ≥15°-25°,NDVI increased more significantly than other slope grades with the medium and obvious improvements in more than 40% of the area for annual NDVI and more than 60% for summer NDVI,respectively. However,on the slope of 6° or ≥35°,the annual average NDVI kept basically unchanged and lightly degraded in about 20% of the area.

关 键 词：MODIS/NDVI 坡度 气候带 植被恢复 黄土高原 

分 类 号：S127[农业科学—农业基础科学]