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经多年研究提出了预估不同立地指数各龄级杉木人工林的间伐密度（即保留株数）及相应的间伐量和林分蓄积量的计算模型。
After years of research, we put forward the calculation model of estimating the thinning density (ie, the number of reserved plants) and the corresponding thinning and stand volume of Chinese fir plantations with different site indices.