Change feature of net primary productivity of natural vegetation and its impact factors over the source region of the Yangtze River in recent 50 years
YAO Yubi, YANG Jinhu, WANG Runyuan, LU Dengrong
Ecology and Environment . 2010, (11): 2521 -2528 .  DOI: 10.16258/j.cnki.1674-5906(2010)11-2521-08

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