热带次生林森窗平均气温空间分布特征的初步分析

森林群落演替更新作为生态学研究的核心问题 ,一直是研究热点 ,而群落演替更新的重要生态动力乃是自然或人为的干扰。国内外关于大尺度干扰对不同森林类型演替更新已有较详细的研究 ;从 2 0世纪 80年代初开始 ,小尺度的林窗干扰开始受到广泛重视。由于林窗是群落演替的起始地 ,其大小和环境变化程度决定了林窗发展的方向和速度 ,并且林窗的更新状况直接影响到顶级森林的结构、种类组成和种群动态。对于世界范围内的各种森林类型的更新和演替均有重要作用 17] ,而在热带雨林中的作用更加显著和重要15] ,因此 ,国外学者十分重视林窗的研究。…

Principle Analysis on Characteristics of the Spatial Variation of Average Air Temperature in Tropical Secondary Forest Canopy Gap

Temperature measurements at the secondary forest canopy gap were conducted in Xishuangbanna, Yunnan in fog-cool season and dry-hot season. On the basis of this measurements, the air temperature characteristics and their spatial variations in different seasons in the secondary forest canopy gap were discussed. The findings showed that there was a significant thermal effect at the gap.The effect of sunshine on the air temperature in the gap was quite different, the extreme value was on the eastern edge of gap, which may be a reason to form the gap microclimate. The results supplied a basis on further study canopy gap microclimate and the relevant ecological phenomena.