ASSESSMENT OF GRASSLAND DEGRADATION IN GUINAN COUNTY, QINGHAI PROVINCE, CHINA, IN THE PAST 30 YEARS.Published in:Land Degradation & Development, 2009, v. 20, n. 1, p. 55, doi. 10.1002/ldr.877By:FENG, Y.;LU, Q.;TOKOLA, T.;LIU, H.;WANG, X.Publication type:Article