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为简化吉林省中、东部地区山杨、柞树林分不同年令阶段、不同立地条件类型的森林抚育间伐,并以此对确定林分工艺成熟和林分生长予测、予报等提供理论依据和一些重要参数,现将研究结果简介于下,不足之处,请指正。一、资料搜集山杨(P. davidiana),柞树(Q. mongolica)林分密度及其相应平均直径资料,取自1963—1964年林业部调查设计局综合调查队、二大队及吉林省林业勘察设计院编《吉林省中东部地区山杨、柞树天然次生林林分生长过程表》。
In order to provide a theoretical basis for determining the mature maturity and stand growth prediction and reporting of stands of Populus euphratica and oak shrubs in different years and different site conditions in the middle and eastern areas of Jilin Province And some important parameters, the research results are summarized below, inadequacies, please correct me. I. Data collection P. davidiana and Q. mongolica stand density and their corresponding average diameter data were obtained from the comprehensive survey team of Survey and Design Bureau of the Ministry of Forestry of 1963 to 1964 and the second largest unit and the forestry investigation of Jilin Province Design Institute compiled “in central and eastern Jilin Province aspen, oak tree natural secondary forest stand growth process table.”