Study on Precipitation Hydro-chemical Characteristic of Mixed Forest of Poplar and Birch of North Mountain of Hebei Province
LIU Yang, YANG Xinbing, CHEN Bo, ZHAO Xinmiao, TIAN Chao, ZHANG Jianhua
Ecology and Environmental Sciences . 2011, (11): 1665 -1669 .  DOI: 10.16258/j.cnki.1674-5906(2011)11-1665-05

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