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首页> 外文期刊>Journal of Vegetation Science >Vertical distribution of Hymenophyllaceae species among host tree microhabitats in a temperate rain forest in Southern Chile
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Vertical distribution of Hymenophyllaceae species among host tree microhabitats in a temperate rain forest in Southern Chile

机译：智利南部温带雨林寄主树微生境中的门生菌属物种的垂直分布

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QuestionAre differences in microhabitat preferences of co-occurring epiphytic Hymenophyllaceae species (filmy ferns) correlated with differences in ecophysiological responses to light availability and humidity in the host tree?LocationThe Andean foothills in south-central Chile.MethodsWe evaluated the distribution pattern of nine filmy fern species in microhabitats that differ in light availability and humidity in four host tree species. A DCA was developed to assess Hymenophyllaceae species microhabitat preference in terms of canopy openness (CO) and relative humidity. We assessed whether differences in chlorophyll content, maximum photochemical efficiency (Fv/Fm), photosynthetic capacity (A(max)), evapotranspiration (E) and instantaneous water use efficiency (WUE) are consistent with any pattern.ResultsCO and relative humidity differed significantly with height in the host trees. While CO increased with height in a host tree, relative humidity decreased. DCA analysis showed that filmy fern species distribution within and among trees was mainly explained by the relative humidity of the microhabitat. Chlorophyll content, chlorophyll a/b ratio, A(max) and E differed significantly among filmy fern species. A(max) and E were correlated with axis 1 scores from the DCA analysis.ConclusionsThe vertical distribution and abundance of filmy fern species in Chilean temperate rain forest seems to be closely related to the different microhabitats offered by host trees. This pattern may reflect interspecific differences in ecophysiological traits related both to light availability and humidity. Our results suggest that humidity is the main environmental factor driving functional responses and habitat preferences of these filmy fern species.
机译：问题同时存在的附生的膜泡科植物（膜状蕨类）在微生境偏好上的差异是否与寄主树对光利用率和湿度的生态生理响应的差异有关？位置智利中南部的安第斯山麓丘陵地区方法我们评估了九种膜状蕨类植物的分布模式在四个栖息树物种中，光利用度和湿度不同的微生境中的物种。开发了DCA以评估冠层开口度（CO）和相对湿度方面的猪膜菌物种微生境偏好。我们评估了叶绿素含量，最大光化学效率（Fv / Fm），光合能力（A（max）），蒸散量（E）和瞬时水分利用效率（WUE）的差异是否与任何模式均相符。结果CO和相对湿度差异显着在寄主树上的高度。当寄主树中的CO随着高度增加而增加时，相对湿度降低。 DCA分析表明，薄膜蕨类植物在树木内部和树木之间的分布主要由微生境的相对湿度解释。薄膜蕨类植物的叶绿素含量，叶绿素a / b比，A（max）和E存在显着差异。 A（max）和E与DCA分析中的轴1得分相关。结论智利温带雨林中薄膜蕨类植物的垂直分布和丰富程度似乎与寄主树提供的不同微生境密切相关。这种模式可能反映了与光的可利用性和湿度有关的生态生理特性的种间差异。我们的结果表明，湿度是驱动这些薄膜蕨类植物功能响应和栖息地偏好的主要环境因素。

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