Multiple trait dimensions mediate stress gradient effects on plant biomass allocation, with implications for coastal ecosystem services
Multiple trait dimensions mediate stress gradient effects on plant biomass allocation, with implications for coastal ecosystem services
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DOI：
10.1111/1365-2745.13393
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发表时间：
2020-05-07
影响因子：
5.5
通讯作者：
Griffin, John N.
中科院分区：
文献类型：
--
作者：
De Battisti, Davide;Fowler, Mike S.;Griffin, John N.
植物经济谱（PES）预测了从资源保护到快速资源获取连续体中的一系列相关性状。除了争夺资源之外，植物还需要应对其他环境压力来生存和繁殖。然而，目前尚不清楚多种策略（即与PES不相关的性状）如何影响植物生物量分配，从而阻碍了我们将环境梯度与生态系统服务联系起来的能力。研究了盐沼先驱物种米草属（Spartina anglica）叶片和根系性状在盐度、氧化还原和含沙量梯度上的种内维度，并将其与海岸沼泽中与波浪衰减和沉积物稳定相关的地上和地下植物生物量特性联系起来。通过主成分分析，我们没有发现单一PES性状维度（策略）的支持，而是确定了4个性状维度：(a)叶片经济谱（LES，叶片模拟PES）；(b)细根-根茎；(c)粗根；(d)盐挤压。结构方程模型显示，随着盐度的增加，LES向保守侧移动，而氧化还原对粗根维数有积极影响。反过来，这些性状维度与地上和地下生物量分配密切相关。这些结果表明，在高盐度条件下，植物将采取保守策略，并将更多地投入到BLW生物量中。然而，高沉积物氧化还原仍将允许植物投资于地上生物量。因此，植物性状介导的生物量分配取决于局部尺度上非生物因子的特定组合。我们的研究强调了考虑多种生态策略对理解环境对植物的影响的重要性。非生物胁迫可以影响多个性状策略维度，从而影响生态系统功能。
The plant economic spectrum (PES) predicts a suite of correlated traits in a continuum from resource conservation to rapid resource acquisition. In addition to competing for resources, plants need to cope with other environmental stresses to persist and reproduce. Yet, it is unclear how multiple strategies (i.e. traits uncorrelated with the PES) affect plant biomass allocation, hindering our ability to connect environmental gradients to ecosystem services.We examined intraspecific dimensionality of leaf and root traits in the salt marsh pioneer species Spartina anglica across salinity, redox and sand content gradients, and related them to above-ground and below-ground plant biomass-properties associated with wave attenuation and sediment stabilization in coastal marshes.Through principal component analysis, we did not find support for a single PES trait dimension (strategy), but instead identified four trait dimensions: (a) leaf economic spectrum (LES, leaf analogue of PES); (b) fine roots-rhizomes; (c) coarse roots; and (d) salt extrusion. Structural equation modelling showed a shift towards the conservative side of the LES under increasing salinity, while redox had a positive influence on the coarse roots dimension. In turn, these trait dimensions were strongly associated with above-ground and below-ground biomass (BLW biomass) allocation.These results indicate that under high salinity, plants will adopt a conservative strategy and will invest more in BLW biomass. Yet, high sediment redox would still allow plants to invest in above-ground biomass. Therefore, plants' trait-mediated biomass allocation depends on the specific combination of abiotic factors experienced at the local scale.Synthesis. Our study highlights the importance of considering multiple ecological strategies for understanding the effect of the environment on plants. Abiotic stresses can influence multiple trait strategy-dimensions, with consequences for ecosystem functioning.