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Ecohydrology of epiphytes: Modelling water balance, CAM photosynthesis, and their climate impacts
Ecohydrology ( IF 2.6 ) Pub Date : 2021-01-01 , DOI: 10.1002/eco.2275
Greta Miller 1, 2 , Samantha Hartzell 1, 3 , Amilcare Porporato 1, 4
Affiliation  

Epiphytes are aerial plants, often characterized by CAM (crassulacean acid metabolism) photosynthesis, which make up a significant portion of the biomass in some rainforests. Their unique characteristics have not yet been included in ecohydrological models, and their potential impact on local hydrometeorology is largely unexplored. This work introduces a water balance model for epiphytes, which adapts the soil‐plant‐atmosphere continuum model to represent a plant system without soil and couples it to the Photo3 photosynthesis model, which includes CAM photosynthesis. The model, which is parameterized with field data of Guzmania monostachia, accurately captures the observed hydraulic and photosynthetic behaviour of the epiphytic species. The application of vertical profiles of environmental inputs within the rainforest canopy shows increasing transpiration rates and decreasing water use efficiency with increasing canopy height, which corresponds to observed distributions of epiphytes in rainforests. Given that vascular epiphytes constitute a maximum of 35–50% of the foliar biomass in rainforests and contribute up to 13% of forest net primary production, they may contribute up to 10–50% of total rainforest evapotranspiration, a significant portion of the water cycle on the local ecosystem scale. The results of this work provide a missing piece to current ecohydrological models and can be integrated into Earth system models to help improve the physical representation of transpiration and free‐surface evaporation from canopy in current and future climates.

中文翻译:

附生植物的生态水文学:模拟水平衡,CAM光合作用及其气候影响

附生植物是气生植物,通常具有CAM(十字花酸代谢)光合作用的特征,而CAM在某些雨林中占生物量的很大一部分。它们的独特特征尚未包括在生态水文模型中,而且它们对当地水文气象学的潜在影响在很大程度上尚待探索。这项工作引入了附生植物的水平衡模型,该模型适用于土壤-植物-大气连续体模型来表示没有土壤的植物系统,并将其耦合到包括CAM光合作用的Photo3光合作用模型。该模型由古斯曼尼亚单枝菊的田间数据参数化准确地捕获了附生物种的观察到的水力和光合作用行为。在雨林冠层内使用环境输入的垂直剖面图显示,随着冠层高度的增加,蒸腾速率增加,水分利用效率降低,这与热带雨林中附生植物的分布相对应。考虑到维管附生植物最多占雨林叶片生物量的35–50%,并贡献了森林净初级生产的13%,因此它们可能占雨林蒸散总量(水的很大一部分)的10–50%。在当地生态系统规模上循环。
更新日期:2021-01-01
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