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Direct and indirect effects of tidal elevation on eelgrass decomposition

机译:潮汐升高对鳗草分解的直接和间接影响

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In urbanised coastal environments, where shoreline migration is impeded by hard structures, sea-level rise is expected to impact decomposition processes by changing the patterns of tidal inundation. We assessed how tidal elevation directly (by determining the decomposition environment) and indirectly (by determining leaf traits) influences the decay of the south-east Australian seagrass Zostera muelleri. First, we assessed how the standing biomass and quality of Z. muelleri leaves varied across a tidal elevation gradient. Second, we used a litter-bag experiment to assess how the effects of tidal elevation on leaf traits and the decompositional environment interact to influence the decomposition rate. Surveys of 3 estuaries revealed that the size and stiffness of seagrass blades increased with depth, and the carbon and fibre content of blades was greater at subtidal and low intertidal zones than at high intertidal elevations. The differences in leaf traits among tidal elevations were, however, less important than the differences in aerial exposure for controlling the decomposition rate. The litter bags incubated at subtidal and low intertidal elevations had a faster rate of decomposition than those incubated in the high intertidal, irrespective of litter quality. Across elevations, the decay rates of the intertidal seagrass and the stiffer subtidal Zostera were similar. These results suggest that sea-level rise will influence decay processes by changing the decompositional environment rather than by changing tissue quality. Studies investigating differences in litter production among tidal elevations and the capacity of hydrodynamic processes to transport excess litter are now required to facilitate ecosystem-level predictions of the effects of sea-level rise.
机译:在城市化的沿海环境中,坚硬的结构阻碍了海岸线的迁徙,预计海平面上升将通过改变潮汐淹没的方式来影响分解过程。我们评估了潮汐的高低如何直接(通过确定分解环境)和间接(通过确定叶片性状)如何影响澳大利亚东南海草Zostera muelleri的衰落。首先,我们评估了潮汐海拔梯度上穆氏Z.叶的站立生物量和质量如何变化。其次,我们使用垃圾袋实验评估潮高对叶片性状和分解环境的影响如何相互作用以影响分解速率。对3个河口的调查显示,海草叶片的尺寸和刚度随深度增加而增加,潮间带和低潮间带的碳和纤维含量比潮间高程高。然而,潮汐海拔之间叶片性状的差异并不重要于控制分解速率的空气暴露差异。与潮间高和潮间低海拔温育的垃圾袋相比,在潮间高海拔下温育的垃圾袋,分解速度更快,无论其质量如何。在整个海拔高度上,潮间带海草和较硬的潮间带Zostera的衰减率相似。这些结果表明,海平面上升将通过改变分解环境而不是通过改变组织质量来影响衰变过程。为了促进生态系统对海平面上升影响的预测,现在需要进行有关潮汐海拔之间的凋落物生产差异和水动力过程运输过量凋落物的能力的研究。

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