1College of Informatics, South China Agricultural University, Guangzhou 510642 ,Guangdong, China;2College of Agriculture and Animal Husbandry, Qinghai University,Xining 430072,Qinhai, China
XU Jianbo,SONG Lisheng,ZHAO Zhizhong,HU Yueming,LIU Chang. Monitoring grassland degradation dynamically at Maduo County in source region of Yellow River in past 15 years based on remote sensing[J]., 2012, 35(04): 615-622.
〔5〕LIU Y,ZHA Y,GAO J,et al.Assessment of grassland degradation near Lake Qinghai,West China using Landsat TM and in situ reflectance spectra data〔J〕.International Journal of Remote Sensing,2004,25(20):4177-4189.
〔6〕BECK P S A,ATZBERGER C,HOGDA K A,et al.Improved monitoring of vegetation dynamics at very high latitudes:A new method using MODIS NDVI〔J〕.Remote Sensing of Environment,2006(100):321-334.
〔10〕IGUTMAN G,IGNATOV A.The derivation of the green vegetation fraction from NOAA AVHRR data for use in numerical weather prediction models〔J〕. International Journal of Remote Sensing,1998,19(8):1533-1543.
〔14〕DAVIDSON A,CSILLAG F.The influence of vegetation index and spatial resolution on a twodate remote sensingderived relation to C4 species coverage〔J〕. Remote sensing of Environment,2001,75:138-151.
〔17〕CHEN F,KISSEL D E,West L T,et al.Fieldscale mapping of surface soil organic carbon using remotely sensed imagery〔J〕. Soil Science and Society of American Journal,2000,64:746-753.