Government‘s functions in eco-environmental protection under market economy DE-FARMING AND REAFFORESTATION POLICY EFFICIENCY REVIEW AND ANALYSIS OF WEST DEVELOPMENT APPROACHING MARKET THEORY AND METHOD OF FOREST ECOLOGICAL BENEFITS ACCOUNTING Analysis of the external economic effects of animal husbandry in the agro-pastoral transition zone of North China Internalization of Externality Problem of Commercial Forest Calculating and testing cultivated land protection externality using Contingent Valuation Method Environmental Effects of China‘s Import on Primary Timber Products Selection of models and technologies of waste reutilization of Chinese materia medica based on ecological effects