季风常绿阔叶林不同恢复阶段群落优势物种的空间分布格局

运用相邻格子法及聚集度指标测定法,在植被调查的基础上,对云南普洱不同恢复阶段(恢复15a、30a和老龄林)季风常绿阔叶林的刺栲(Castanopsis hystrix)、短刺栲(Castanopsis echidnocarpa)和红木荷(Schima wallichii)3个优势物种进行种群空间分布格局研究,以阐明种群分布格局与生境条件、种群年龄结构的动态关系,揭示种群发育过程中空间动态与生物学机理。结果发现:在所有恢复阶段内,刺栲、短刺栲、红木荷均为聚集分布。在不同尺度下,刺栲在原始林中10m×10m尺度下为均匀分布,而在恢复15年中20m×20m尺度为随机分布;红木荷在10m×20m尺度下为均匀分布,在其它所有恢复阶段和尺度下3个物种均为聚集分布。研究结果表明,不同恢复阶段和不同尺度下刺栲、短刺栲和红木荷3个优势物种绝大多数为聚集分布,说明聚集分布为3个优势种的基本属性。

Spatial Distribution of Dominant Species in Monsoon Evergreen Broad-leaved Forest of Different Restoration Stages

Spatial pattern of plant populations is the result of the interaction between the biological characteristics and environmental factors,and also is the important factor which decides community composition,structure and dynamic.After an investigation on nine 900 m² plots (three plots in restoration 15 year,restoration 30 year and old growth forest,respectively),a study on the spatial distribution pattern of Castanopsis hystrix,Castanopsis echidnocarpa and Schima wallichii population and their dynamics were made by the tests of discrete distribution pattern.The results showed that spatial distribution patterns of C.hystrix,C.echidnocarpa and S.wallichii population were all the clumped distribution in all three communities.We also found that spatial distribution patterns of C.hystrix,C.echidnocarpa and Schima wallichii population were all the clumped distribution in all sampling areas except for C.hystrix in 10 m×10 m in primary forest and in 20 m×20 m in restoration 15 years community and for S.wallichii in 10 m×20 m in restoration 30 years community.The results indicated clumped distribution was the basic attribute of spatial distribution of C.hystrix,C.echidnocarpa and S.wallichii population.