热带次生林林窗边缘树干表面温度时空分布特征

利用热带次生林林窗区域树干和树冠下的表面温度观测资料，探讨了昼间林窗边缘和林内的树干表面温度时空分布规律，以及林窗边缘与林内树干的表面温度差异。指出在林窗区域存在４ 个热力作用面（ 林冠面、林内地面、林窗林缘壁面和林窗地面） ，受太阳直接照射的东侧和北侧林壁是林窗最主要的热力作用面；４ 个热力作用面的热力特征和相互作用制约了林窗的热力变化。其结果可为进一步研究林窗小气候形成机制提供研究基础，并为研究林窗的演替、更新以及对生物多样性影响提供科学依据。

Spatial-temperal Characteristics of Boles Surface Temperature at the Edge of Canopy Gap in Tropical Secondary Forest

Microclimatic measurements were conducted near to the edge of secondary forest canopy gap in Xishuangbanna,Yunnan province in Jan.1999.The daytime spatial temperal characteristics of boles surface temperature at the edge of canopy gap and the interior of secondary forest and the thermal characteristics were discussed.Spatial temperal changes in surface temperature and its defferences between the edge of canopy gap and the interior of forest were also analyzed.The findings show that there are four thermal active surfaces on the vicinage of canopy gap,they are canopy surfaces,soil surface on the interior of forest,woody wall surface of edge and soil surface on the gap.The woody wall surface of edge on the East and North are a key thermal active surface of the canopy gap and the thermal variation were controlled by the thermal characteristics of four active surfaces and the interaction.The results provide a research basis for understanding microclimatic formation of canopy gap,and for studying impacts of forest fragmentation on biodiversity.