Responses of twelve tree species common in Everglades tree islands to simulated hydrologic regimes
Responses of twelve tree species common in Everglades tree islands to simulated hydrologic regimes
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大沼泽地树岛常见的十二种树种对模拟水文状况的响应
DOI：
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发表时间：
2006
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影响因子：
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通讯作者：
K. Jayachandran
中科院分区：
文献类型：
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作者：
David T. Jones;J. Sah;M. Ross;S. Oberbauer;Bernice C. Hwang;K. Jayachandran
十二个树种常见的大沼泽地树岛进行了三个水文制度下控制条件下25周，并评估生长和生理反应。治疗代表高，低，没有洪水保持在水池中的水，以模仿在树岛的不同位置的水深的季节性变化。高洪水处理下的土壤淹没导致树木生长（高度，基径，树冠体积）减少，这是更明显的，发生在梅西奇森林物种比沼泽森林物种。不同物种之间的生理反应不同，虽然气孔导度是一个更好的预测洪水胁迫对生长的影响比相对含水量或叶绿素荧光（Fv/Fm）。一些沼泽物种似乎是更好地适应水位上升比别人;番荔枝glabra，莫雷拉cerifera，和柳caroliniana更积极地应对洪水，而木兰virginiana，波斯borbonia，金刚藤icaco，冬青是不耐洪水。死亡率最高，生长最低的五个高地物种：Bursera simaruba，Coccoloba diversifolia，Eugenia axillaris，Sideroxylon foetidissimum和Simarouba glauca。其中，Sideroxylon和Simarouba在高洪水处理下没有存活到研究结束。潮湿的土壤条件下模拟低洪水处理导致更大的增长，在所有物种相比，土壤淹没高洪水，除了最耐洪水（番荔枝，莫雷拉，柳）。根据它们对实验洪水的反应，物种的排列大致反映了它们在树岛上的空间分布。在这个实验中所展示的物种反应的梯度可能有助于指导负责任的水管理和树岛恢复在大沼泽地。
Twelve tree species common in Everglades tree islands were subjected to three hydrologic regimes under controlled conditions for 25 weeks and assessed for growth and physiological responses. Treatments representing high, low, and no flood were maintained in pools of water to mimic seasonal variation in water depths at different positions in tree islands. Soil inundation under the high flood treatment resulted in reduced tree growth (height, basal diameter, crown volume) that was more pronounced and occurred earlier in mesic forest species than in swamp forest species. Physiological responses differed less among species, although stomatal conductance was a better predictor of the effects of flood stress on growth than either relative water content or chlorophyll fluorescence (Fv/Fm). Some swamp species appeared to be better adapted to rising water levels than others; Annona glabra, Morella cerifera, and Salix caroliniana responded more positively to flooding, while Magnolia virginiana, Persea borbonia, Chrysobalanus icaco, and Ilex cassine were less flood-tolerant. The highest mortalities and lowest growth were observed in the five upland species: Bursera simaruba, Coccoloba diversifolia, Eugenia axillaris, Sideroxylon foetidissimum, and Simarouba glauca. Of these, Sideroxylon and Simarouba did not survive to the end of the study under the high flood treatment. The moist soil conditions simulated by the low flood treatment resulted in greater growth in all species compared to soil inundation under high flood, except for the most flood-tolerant (Annona, Morella, Salix). The arrangement of species according to their responses to experimental flooding roughly paralleled their spatial distribution in the tree islands. The gradient in species responses demonstrated in this experiment may help guide responsible water management and tree island restoration in the Everglades.