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一、前言间伐的主要目的是为保留木创造适宜的营养空间和良好的林分卫生条件,以提高大径木的产量和质量,缩短成材期。因此,间伐后大径的产量是考察间伐效益的一个重要指标。但过往研究间伐效果大多足强调保留木胸径生长量和林分材积生长量,而对大径木的变化不甚了解。本法的特点恰是提供了大径木的信息,为考察间伐效果开辟了新的途径。
I. Preface The main purpose of thinning is to create suitable nutrition space and good stand sanitation conditions for preserving wood so as to increase the yield and quality of large diameter wood and shorten the material life. Therefore, the production of large diameter after thinning is an important index for evaluating the efficiency of thinning. However, the past researches mainly emphasize the effect of thinning on the DBH growth and stand volume growth, but do not know much about the changes of DBH. This law is characterized by the provision of information on the large diameter wood, opening up a new way for the study of thinning effect.