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Elevated carbon dioxide and reduced salinity enhance mangrove seedling establishment in an artificial saltmarsh community.
Oecologia ( IF 2.7 ) Pub Date : 2019-11-25 , DOI: 10.1007/s00442-019-04563-1
Anthony Manea 1 , Ina Geedicke 1, 2 , Michelle R Leishman 1
Affiliation  

The global phenomenon of mangrove encroachment into saltmarshes has been observed across five continents. It has been proposed that this encroachment is driven in part by rising atmospheric CO2 concentration and reduced salinity in saltmarshes resulting from rising sea levels enhancing the establishment success of mangrove seedlings. However, this theory is yet to be empirically tested at the community-level. In this study, we examined the effect of CO2 and salinity on seedling growth of two mangrove species, Aegiceras corniculatum and Avicennia marina, grown individually and in a model saltmarsh community in a glasshouse experiment. We found that the shoot (210%) and root (91%) biomass of the saltmarsh species was significantly greater under elevated CO2. As a result, both mangrove species experienced a stronger competitive effect from the saltmarsh species under elevated CO2. Nevertheless, A. marina seedlings produced on average 48% more biomass under elevated CO2 when grown in competition with the saltmarsh species. The seedlings tended to allocate this additional biomass to growing taller suggesting they were light limited. In contrast, A. corniculatum growth did not significantly differ between CO2 treatments. However, it had on average 36% greater growth under seawater salinity compared to hypersaline conditions. Avicennia marina seedlings were not affected by salinity. From these results, we suggest that although CO2 and salinity are not universal drivers determining saltmarsh-mangrove boundaries, it is likely that rising atmospheric CO2 concentration and reduced salinity associated with sea level rise will enhance the establishment success of mangrove seedlings in saltmarshes, which may facilitate mangrove encroachment in the future.

中文翻译:

二氧化碳的增加和盐分的降低促进了人工盐沼群落中红树林幼苗的建立。

在五大洲都观察到了全球红树林侵蚀盐沼的现象。已经提出,这种侵害部分是由于大气CO2浓度升高和海平面上升导致盐沼盐分降低所致,从而促进了红树林幼苗的成功建立。但是,该理论尚未在社区一级进行实证检验。在这项研究中,我们通过温室试验,研究了CO2和盐分对两种红树林物种(Aegiceras corniculatum和Avicennia marina)的幼苗生长的影响,这些红树林物种分别生长在一个模型和盐沼群落中。我们发现盐沼物种的枝条(210%)和根(91%)生物量在二氧化碳升高的情况下明显更大。结果是,在二氧化碳浓度升高的情况下,两种红树林物种都比盐沼物种具有更强的竞争作用。然而,与盐沼物种竞争生长时,滨海曲霉幼苗在较高的CO2浓度下平均可增加48%的生物量。幼苗倾向于将这种额外的生物量分配给更高的植物,表明它们是光有限的。相反,在二氧化碳处理之间,A。corniculatum的生长没有显着差异。但是,与高盐条件相比,它在海水盐度下平均增长了36%。Avicennia滨海幼苗不受盐度的影响。根据这些结果,我们认为,尽管二氧化碳和盐分并不是决定盐沼-红树林边界的普遍驱动因素,
更新日期:2019-11-01
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