一、前言党的十一届三中全会以来,由于在林业工作中实行了生产责任制,大力发展专业户、重点户和联合经营,统计对象已从过去以生产队、林场为单位转为千家万户,继续采用单一的全面调查方法已不适应新形势发 I. Introduction Since the Third Plenary Session of the Eleventh Central Committee of the Communist Party of China, as a result of implementing the system of production responsibility in forestry and vigorously developing specialized households and key households and joint ventures, the statistical objects have been converted from past production units and forest farms to those of thousands of families Households continue to adopt a single comprehensive investigation method that is no longer suitable for the new situation