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Analyses of Factors Influencing the Households’ Behavior in Non-Timber Forest Products Management with Structural Equation Modeling (SEM)：A Case Study in Ya’an City of Sichuan Province Influence of selection cutting on sustainable timber production of a broadleaved Korean pine (Pinus koraiensis) forest on Changbai Mountain Evaluation of ecosystem provisioning service and its economic value. Multi-objective Management Planning of Carbon Storage in Larix gmelinii Natural Forest in Great Xing’an Mountains