EFFECTS ON CARBON FLUX OF CONVERSION OF GRASSLAND STEPPE TO CROPLAND IN CHINA
ZHANG Wen-Li, CHEN Shi-Ping, MIAO Hai-Xia, LIN Guang-Hui
Chin J Plant Ecol . 2008, (6): 1301 -1311 .  DOI: 10.3773/j.issn.1005-264x.2008.06.011