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Air negative ion concentration in different modes of courtyard forests in southern mountainous areas of Jinan, Shandong Province of East China.
WANG Xiao-lei1, LI Chuan-rong2, XU Jing-wei3, HU Ding-meng3, ZHAO Zhen-lei2, ZHANG Liu-dong2
Chinese Journal of Applied Ecology . 2013, (2): 373 -378 .