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研究了四川省盐亭县桤柏混交林中桤木和柏木种群的生物量动态、密度动态及 种群密度对生物量动态的调节．结果表明，桤木种群生物量在１８ ａ内符合逻辑斯蒂增长， 柏木种群生物量在２０ ａ内呈幂函数增长．而种群密度在 １８ ａ内均呈负幂函数降低在桤 柏混交林中．密度制约是决定种群生物量动态的主要因素，棺木和柏本平均单株生物量较 符合Ｙｏｄａ提出的－３／２自疏定律为快，其自疏系数分别为一２．３３和一３．９７．个体平均生 物量的增长比由密度下降引起的生物量降低快，因此，两种群生物量在密度调节过程中仍 然保持增长状态．其中柏木是生物量增长旺盛的种群．
The dynamics of biomass, density and density of population of alder and cypress wood mixed with cypress wood in Yanting County of Sichuan Province were studied to adjust the biomass dynamics. The results showed that the biomass of Alnus cremastogyne logarithmically increased within 18 years, and the biomass of cypress trees increased exponentially within 20 years. However, the population density decreased with a negative power function in the mixed cypress and cypress forests within 18 years. Density control is the main factor that determines the dynamics of population biomass. The average biomass per plant of coffin and cypress is faster than that of -3/2 sparseness law proposed by Yoda, and their self-sparse coefficients are -2.33 and -3 respectively. 97. The average biomass of individuals increased more rapidly than that caused by the decrease of density, so the biomass of the two populations still maintained their growth status during the process of density adjustment. Among them, cedar is a population with strong biomass growth.