四川大头茶种群优势度增长动态的初步研究

A study on the growth dynamics of dominance of Gordonia acuminata population

用有限空间种群增长的逻辑斯谛模型探讨了四川缙云山大头菜种群胸面积的增长规律．结果是：大头茶种群在不同林分密度下的纯林中，其胸面积最大增长速度是中密度＞高密度＞低密度，达到最大增长速度的径级范围都在１８ｃｍ左右；在不同林型中，大头茶种群胸面积的最大增长速度是纯林最大，常绿阔叶林次之，针阔混交林最小，达到最大增长速度的时间以针阔混交林最长，常绿阔叶林次之，纯林最短．还讨论了大头茶种群在不同林分密度下，不同林型中环境容纳量、内禀增长率的变化规律．

The growth regulation of bteast area of Gordonia acuminata population in Mt.Jinyun was investigated through the Logistic Model of population growth in finite space. The results show as follows. In terms of the maximum growth rate of breast area of Gordonia acuminata population in pure forest with with different stand densities,in mid-density it is the highest,in hish density it is higher, while in low density it is the lowest.The range of dianeter class to reach maximum growth rate is about 18 cm. However,in pure forest the maximum growth rate of breast area of Gordonia acuminata population is the highest, in evergreen broad-leaved forest it is higher and in mixed needle-broad forest it is the lowest. interestingly.lt's just opposite to take time for the population to reach the maximun growth rate in three stands.Besides these above. The environment carrying capacity and the regulation of intrinsic growth rate in different stand densities and different forest types are discussed,too.