不同植被指数反映地表植被覆盖度的比较分析——以甘肃河西走廊地区为例  

Comparative Analysis on the Reflection Effect of the Vegetationon the Earth's Surface by Different Vegetation Indices:A Case Study in Hexi Corridor

作　　者：何雅枫[1,2] 花立民[3] 邸利[2] 

机构地区：[1]成都理工大学地球科学学院,成都610059 [2]甘肃农业大学资源与环境学院,兰州730070 [3]甘肃农业大学草业学院,兰州730070

出　　处：《中国农学通报》2014年第19期45-50,共6页Chinese Agricultural Science Bulletin

基　　金：农业部公益性行业项目"牧区生态高效草原牧养技术模式研究与示范项目"(201003061);草业生态系统重点实验室(甘肃农业大学)开放基金"不同草地管理制度对农牧交错带退化草原群落与土壤的影响研究"(CYZS-2011013)

摘　　要：针对不同的地表植被覆盖情况,以期合理精准的选择植被指数反映地表植被效果给予一定的技术支持,选择甘肃省河西走廊地区为研究对象,基于甘肃省MODIS影像数据,借助ERDAS、ArcGIS地图处理软件及SPSS统计分析软件对不同植被指数(NDVI、PVI、RVI)反映地表植被覆盖度的效果进行了比较研究。分析结果显示:河西走廊北部东中西3段的以NDVI值估算的植被覆盖度分别为0.33、0.31、0.42,祁连山西中东3段分别为0.62、0.62和0.37,进而研究PVI和RVI与不同植被覆盖度区域相关性。经研究分析得出:对于高盖度植被覆盖地区,RVI所反映的植被覆盖度明显优于PVI;对于低盖度植被覆盖地区,由于PVI受土壤背景(质地、亮度)和大气影响较小,比RVI更能反映荒漠等沙粒质地表区域。According to the different coverage of the surface vegetation, the study chose the reasonablevegetation index to reflect the effect of vegetation, and gave a certain technical support. Selected Hexi Corridorin Gansu Province as study area, the paper studied the correlation between different vegetation indices（PVI and RVI） and vegetation coverage, which was based on the NDVI value. The results showed the value of NDVI,the estimated vegetation coverage in the east, middle and west sections in the northern Hexi Corridor were0.33, 0.31 and 0.42 respectively, the NDVI in the east, middle and west sections in the Qilian Mountains were0.62, 0.62 and 0.37. The correlation between the PVI, RVI and different vegetation coverage indicated that theeffect of RVI on reflecting the vegetation coverage in the high vegetation coverage area was significantly betterthan the effect of PVI. However, in the low vegetation coverage area, PVI was better than RVI because it canreflect the grain of sand nature of surface such as desert due to the little influence come from the soilbackgroundsuch as brightness and substance, and atmosphere.

关 键 词：植被覆盖度 MODIS影像 ERDAS ArcGIS 河西走廊 

分 类 号：S127[农业科学—农业基础科学]