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The Leaf Temperature Characteristics of Colonists of the Secondary Forest Gap in the Rain Season in Xishuangbanna
Author(s): 
Pages: 78-82
Year: Issue:  1
Journal: JOURNAL OF NANJING FORESTRY UNIVERSITY(NATURAL SCIENCE EDITION)

Keyword:  热带次生林林窗定居种雨季叶表温特征;
Abstract: 利用西双版纳雨季(7月)次生林林窗叶表温的观测资料,探讨了林窗内定居种冠层温度的时空变化特征.结果表明,因林窗不同区域所接受太阳辐射的差异,加之林缘热力效应的综合作用,使得林窗定居种冠面在不同时段其最大热力作用区域是各异的;林窗各测点与中央的叶表温差区域分异显著,特别是中午的分异最为明显.植株叶表温度与气温平衡在25.8℃附近,但因受日照、林缘树木的综合影响,不同方位达平衡的时刻不同:林窗南侧边缘叶表温与气温整天基本处于平衡状态,下午16时后受阴天和树冠荫蔽的影响,各测点叶表温与气温均处于平衡状态;在晴好天气状况及不受荫蔽状况下,叶表温高于气温,波动范围为0~3℃;15时雨后初晴,叶面蒸发耗热,叶表温低于气温.这种"峰值动态位移现象"可能会影响不同时期物种的入侵、定居、繁殖,进而影响林窗物种的组成.
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