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Relationships between ecological site quality and site index of lodgepole pine and white spruce in Northern British Columbia Impacts of Climate Change on Productivity of Forests in China Ⅱ.Geographic Distribution of Actual Productivity of Forests in China Relationships between the Woodland Fragmentation, Farmers‘ Investment and Forest Productivity in the Reform of Collective Forest Property Right System: An Empirical Analysis of 602 Households Survey in 8 Counties of Jiangxi Province PREDICTION OF NET PRIMARY PRODUCTIVITY OF FORESTS IN CHINA IN RESPONSE TO CLIMATE CHANGE