缙云山四川大头茶叶种群的结构及其动态

QUANTITATIVE STRUCTURE AND DYNAMICS OF LEAF POPULATIONS OF GORDONIA ACUMINATA ON JINYUN MOUNTAIN

基于Ｈａｒｐｅｒ的构件结构理论，初步分析了缙云山四川大头茶各龄级代表基株的叶种群的数量结构及其增长动态。结果表明：各龄级基株叶种群的出生率均为单峰型曲线，峰值一般在３月末至４月初形成，展叶类型接近“爆发型”格局。死亡率为双峰曲线，第一峰值稍滞后于出生率峰值形成于４月初，另一峰值位于生长季末。在株龄ｔ≤７３年的范围内，采用幂函数和Ｌｏｇｉｓｔｉｃ方程均可对株龄与叶种群大小进行较好拟合。较早出生的新叶的面积和生物量增长速率都比较晚出生的慢；２、３龄老叶的面积几乎不再增长，生物量增长亦甚微。全株叶种群的最大面积在成株中（≥２０年）形成于７～８月，在幼树中为８～９月。成株将以最大叶面积为本生长季的生殖（开花）作好充分准备。

Based on the modular theory,the size dynamics,growth pattern and quantitative structure of leaf population of representative genets of Gordonia acuminata were studied.The results were as follows: The natality of leaf population in all genets followed a monomodal curve and it reached its peak value from the end of March to the beginning of April.The pattern of leafexpanding approximates the “flushtype” suggested by Kikuzawa(1983).The mortality is bimodal shape.The first peak appeared at the beginning of April,which was just a little later than that of the natality's. The second peak appeared at the end of the growing season. The relationship between the genet's age and its leaf population size could be well modeled by means of the power function and the Logistic equation.The earlier the new leaves were born,the more slowly their leaf areas and biomass increased.Generally,the area of 2 or 3 years old leaves no longer increased.The maximum area of leaf population appeared from July to August in mature genets,and from August to September in young genets.But the maximum biomass is formed in October in both mature and young genets.This suggests the mature genets reproduce between formation of the maximum leaf area and formation of the maximum number of leaves or biomass.