Change in drivers of mangrove crown displacement along a salinity stress gradient
Change in drivers of mangrove crown displacement along a salinity stress gradient
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红树林树冠沿盐度应力梯度位移驱动因素的变化
DOI：
10.1111/1365-2435.13218
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发表时间：
2018
影响因子：
5.2
通讯作者：
J. López‐Portillo
中科院分区：
文献类型：
--
作者：
A. Vovides;U. Berger;Uwe Grueters;R. Guevara;A. Pommerening;A. Lara;J. López‐Portillo
。全球变化。我们测试了地上相互作用随着土壤应力的增加而减少的假设，而风成为红树林的主要驱动力。
2。我们研究了邻居，风强度和方向对红树林冠层冠状和沿盐度梯度沿冠层的冠状的影响，并评估了三种红树林物种的冠状不对称性，以及冠状位移对减少冠冠型面积重叠的贡献。
3.结果表明，在低盐度下，冠层的冠状会受到风的强烈影响。与较大的牙冠相关，可有效地减少较高的盐度，因为牙冠位移引起的冠层重叠，这表明地上植物相互作用会随着土壤应力的增加而减少。
4。虽然避免邻居是最佳光觅食的基本策略，但这项研究表明，风强度和方向性是冠状形状的主要驱动因素，压力增加，并突出了它们在植物相互作用和森林结构中的潜在影响，这表明树木对灾害的敏感性增加了，应进一步研究。
1. Crown displacement in trees is an adaptive response driven by neighbours that optimizes space use and reduces competition. But it can also be the result of wind force. Although morphological responses to neighbours have been well studied, the interplay between neighbours and wind in driving crown shape, and the implications for plant interactions remain poorly understood. However, it is crucial to predict such changes in vegetation structure and function under the scope of global change. We test the hypothesis that aboveground interactions are reduced with increasing soil stress and that wind becomes the main driver of crown shape in mangrove forests.
2. We investigated the effect of neighbours and wind intensity and direction on crown displacement of mangrove canopy and below canopy trees along a salinity gradient, and assessed crown asymmetry for three mangrove tree species, as well as the contribution of crown displacement on reducing crown‐projected area overlap and thus neighbourhood competition.
3. Results show that crown displacement of canopy trees is strongly influenced by winds at all salinities. At low salinities, competition for space accounted for 48% of crown displacement away from neighbours, compared to 49% found for the synthetized effects of wind and neighbours. While trees below the canopy displace their crowns away from their neighbours, no response to wind could be detected. This can be due to the wind protection conferred by a dense canopy stand related to bigger crowns that effectively reduce wind drag. At higher salinities, there was a reduction in canopy overlap due to crown displacement, which suggests reduced aboveground plant interactions with increasing soil stress.
4. While neighbourhood avoidance is a fundamental strategy for optimal light foraging, this study shows that wind strength and directionality are main drivers of crown shape with increasing stress and highlights their potential influence in plant interactions and forest structure, pointing to an increased susceptibility of trees to disturbances that should be further studied.
DOI：
10.1007/s00468-014-1044-8
发表时间：
2014-07
期刊：
Trees
影响因子：
--
作者：
A. Vovides;J. Vogt;Armin Kollert;U. Berger;Uwe Grueters;R. Peters;A. Lara-Domínguez;J. López‐Portillo-J.
通讯作者：
A. Vovides;J. Vogt;Armin Kollert;U. Berger;Uwe Grueters;R. Peters;A. Lara-Domínguez;J. López‐Portillo-J.