Modelling mangrove forest structure and species composition over tidal inundation gradients: The feedback between plant water use and porewater salinity in an arid mangrove ecosystem
Modelling mangrove forest structure and species composition over tidal inundation gradients: The feedback between plant water use and porewater salinity in an arid mangrove ecosystem
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模拟潮汐淹没梯度下的红树林结构和物种组成：干旱红树林生态系统中植物用水和孔隙水盐度之间的反馈
DOI：
10.1016/j.agrformet.2021.108547
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发表时间：
2021
影响因子：
6.2
通讯作者：
Lovelock
中科院分区：
文献类型：
--
作者：
Bathmann;Peters;Berger;Walther;Lovelock
概念模型描述了红树林的森林结构，潮汐淹没，孔隙水盐度和红树林水的使用，但是，反馈的重要性还没有得到评估。我们评估的过程中，水的可用性和植物水分利用之间的反馈红树林生态系统应用过程和个人为基础的红树林模型MANGA，评估个别树木的生长行为，新兴的森林结构，和红树林物种组成。我们比较了模拟数据与现场收集的数据与单种红树林森林，表现出很强的梯度在整个潮间带的树高和生物量。虽然潮汐淹没和由此产生的孔隙水盐度梯度造成的变化，在红树林森林结构内的MANGA模型，包括树用水模型中导致模型结果和现场观测之间的高度相似性。我们进一步表明树的水分利用和孔隙水盐度之间的反馈的重要性出现的物种分区模式。根据特定的现场观测，我们模拟了一个广泛的模拟孔隙水盐度输入的人工林的响应。模拟森林由两个不同的物种，不同的水分利用效率和耐盐性。模拟的反馈机制产生了很强的相关性之间的红树林物种分带沿着潮间带梯度和孔隙水盐度输入系统边界。本研究的结果描述和证明的绝对和相对的重要性，实施相互作用的过程对红树林植被格局。更好地理解潮汐淹没的作用以及植物用水和孔隙水盐度之间的反馈回路在决定红树林结构方面的作用，将有助于预测和管理气候变化中红树林生态系统的命运。
Conceptual models have described mangrove forest structure in response to tidal inundation, porewater salinity and mangrove water use, however, the importance of feedbacks have not been assessed. We assessed the processes underlying the feedback between water availability and plant water use in mangrove ecosystems by applying the process- and individual-based mangrove model MANGA, evaluating individual tree growth behavior, emerging forest structure, and mangrove species composition. We compared simulation data with field data collected at a field site with a monospecific mangrove forest that showed a strong gradient in tree height and biomass across the intertidal zone. While tidal inundation and the resulting porewater salinity gradient caused variation in mangrove forest structure within the MANGA model, the inclusion of tree water use in the model led to high similarity between model results and field observations. We further show the importance of the feedback between tree water use and porewater salinity for emergence of species zonation patterns. In accordance with particular site observations, we simulated the response to a broad spectrum of modelled porewater salinity inputs of an artificial forest. The modelled forest consists of two distinct species differing in their water use efficiency and salt tolerance. The modelled feedback mechanism produced a strong correlation between mangrove species zonation along the intertidal gradient and porewater salinity inputs at the system boundaries. The results of this study describe and demonstrate the absolute and relative importance of the implemented interacting processes on mangrove vegetation patterns. A better understanding of the role of tidal inundation and the feedback loops between plant water use and porewater salinity in determining mangrove forest structure will help to predict and manage the fate of mangrove ecosystems in a changing climate.
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