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    窦军霞, 张一平, 赵双菊, 宋清海. 西双版纳热带季节雨林辐射垂直分布特征[J]. 北京林业大学学报, 2006, 28(2): 15-21.
    引用本文: 窦军霞, 张一平, 赵双菊, 宋清海. 西双版纳热带季节雨林辐射垂直分布特征[J]. 北京林业大学学报, 2006, 28(2): 15-21.
    DOU Jun-xia, ZHANG Yi-ping, ZHAO Shuang-ju, SONG Qing-hai. Characteristics of radiation at different heights within the canopy of a tropical seasonal rain forest in Xishuangbanna, Southwest China[J]. Journal of Beijing Forestry University, 2006, 28(2): 15-21.
    Citation: DOU Jun-xia, ZHANG Yi-ping, ZHAO Shuang-ju, SONG Qing-hai. Characteristics of radiation at different heights within the canopy of a tropical seasonal rain forest in Xishuangbanna, Southwest China[J]. Journal of Beijing Forestry University, 2006, 28(2): 15-21.

    西双版纳热带季节雨林辐射垂直分布特征

    Characteristics of radiation at different heights within the canopy of a tropical seasonal rain forest in Xishuangbanna, Southwest China

    • 摘要: 于西双版纳热带季节雨林观测了林内不同高度和全光照条件下不同波长太阳辐射.通过比较分析,探讨了热带季节雨林垂直方向上不同波长辐射的时空分布特征.雾凉季时昼间各辐射要素值均随高度的下降而递减,而干热季和雨季时,受光斑的影响,个别时刻出现了较低观测点的辐射值高于较高观测点的现象;各季节不同高度各测点的总辐射、红外辐射和可见光日总量值及其与全光照条件下的比值均随高度的降低而减小,且各测点比值均呈现红外辐射>总辐射>可见光的趋势;各测点的辐射值、辐射日总量值、日总量与全光照条件下的比值,以及红外辐射和可见光在总辐射中所占份额均随季节的变化而不同,且这些值在各季节间的大小顺序随测点高度的不同而变化.受林冠对可见光吸收作用的影响,各测点的红外辐射在总辐射中所占份额在各季节均较全光照条件下高,而可见光比值却总低于全光照条件,但无论是在同一季节的不同测点之间,还是同一测点在不同季节之间的红外辐射和可见光所占份额的比较结果均呈现出复杂多变的状况.研究结果充分显示了热带季节雨林垂直方向上不同波长辐射的时空异质性,这势必对植物的生长、更新、演替、群落结构的形成以及森林与大气间物质和能量的交换等诸多方面都起到重要的作用.

       

      Abstract: Based on investigations of radiation of different wavelengths at full light and different heights of a tropical seasonal rain forest in Xishuangbanna,the temporal and spatial characteristics of radiation within the tropical seasonal rain forest are presented.The results show that diurnal radiation decreases from the top of tree downward in the cool foggy season,while in the dry-hot and rainy season,sometimes existed the phenomenon of radiation values at 9 m and 0 m higher than that at 25 m when sunspots appeared.In the cool foggy,dry-hot and rainy seasons,the values of the daily accumulation of solar radiation,infrared radiation and visible light at the measurement sites and the ratios of these daily accumulated values to those of full light all decreased with height.The ratios all showed the tendency of infrared radiation > total solar radiation > visible light.The diurnal values and daily accumulation of solar radiation,infrared radiation and visible light and the ratios of these daily values at sites to those of full light and the ratios of infrared radiation,visible light to total solar radiation all varied with season,in addition,the order of these values at different seasons changed with height.Due to leaf absorption in visible light,the ratios of infrared radiation to total solar radiation at different heights were bigger than those of full light,which were contrary to the ratios of visible light to total solar radiation.However,not only at the same season but different observation sites,but also at the same site but different seasons,the ratios of infrared radiation and visible light to total solar radiation all presented complicated situation.The results indicated the light temporal and spatial heterogeneity in vertical direction within the tropical seasonal rain forest.These characteristics would play a great role in plant growth,regeneration,succession,community architecture formation and mass and energy exchanges between forest and atmosphere.

       

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