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Retrospective analysis of the poplar plantation degradation based on stable carbon isotope of tree rings in Zhangbei County, Hebei, China
SUN Shou-jia, LI Chun-you, HE Chun-xia, ZHANG Jin-song, MENG Ping
Chinese Journal of Applied Ecology . 2017, (7): 2119 -2127 .  DOI: 10.13287/j.1001-9332.201707.024