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Soil Carbon Stocks Vary Across Geomorphic Settings in Australian Temperate Tidal Marsh Ecosystems
Ecosystems ( IF 3.7 ) Pub Date : 2020-06-24 , DOI: 10.1007/s10021-020-00520-9
Connor Gorham , Paul Lavery , Jeffrey J. Kelleway , Cristian Salinas , Oscar Serrano

Tidal marshes rank among the ecosystems with the highest capacity to sequester and store organic carbon (Corg) on earth. To inform conservation of coastal vegetated ecosystems for climate change mitigation, this study investigated the factors driving variability in carbon storage. We estimated soil Corg stocks in tidal marshes across temperate Western Australia and assessed differences among geomorphic settings (marine and fluvial deltas, and mid-estuary) and vegetation type (Sarcocornia quinqueflora and Juncus kraussii) linked to soil biogeochemistry. Soil Corg stocks within fluvial and mid-estuary settings were significantly higher (209 ± 14 and 211 ± 20 Mg Corg ha−1, respectively; 1-m-thick soils) than in marine counterparts (156 ± 12 Mg Corg ha−1), which can be partially explained by higher preservation of soil Corg in fluvial and mid-estuary settings rich in fine-grained (< 0.063 mm) sediments (49 ± 3% and 47 ± 4%, respectively) compared to marine settings (23 ± 4%). Soil Corg stocks were not significantly different between S. quinqueflora and J. kraussii marshes (185 ± 13 and 202 ± 13 Mg Corg ha−1, respectively). The higher contribution of tidal marsh plus supratidal vegetation in fluvial (80%) and intermediate (76%) compared to marine (57%) settings further explains differences in soil Corg stocks. The estimated soil Corg stocks in temperate Western Australia’s tidal marshes (57 Tg Corg within ~ 3000 km2 extent) correspond to about 2% of worldwide tidal marsh soil Corg stocks. The results obtained identify global drivers of soil Corg storage in tidal marshes and can be used to target hot spots for climate change mitigation based on tidal marsh conservation.



中文翻译:

澳大利亚温带潮汐沼泽生态系统中不同地貌环境下的土壤碳储量变化

潮汐沼泽是在地球上螯合和存储有机碳(C org)的能力最高的生态系统之一。为了为保护沿海植被生态系统以缓解气候变化提供信息,本研究调查了驱动碳储存变化的因素。我们估算了西澳大利亚温带地区潮汐沼泽中的土壤C org储量,并评估了与土壤生物地球化学相关的地貌环境(海洋和河流三角洲以及河口中部)和植被类型(Sarcocornia quinquefloraJuncus kraussii)之间的差异。河流中部和河口中部的土壤Corg储量明显更高(209±14和211±20 Mg Corg  ha -1, 分别; 1米厚的土壤)(156±12 Mg C org  ha -1),这在一定程度上可以解释为在细颗粒度较高的河床和河口中部土壤C org的保存性更高(<0.063毫米)的沉积物(分别为49±3%和47±4%)与海洋环境(23±4%)相比。西洋参和克之间的土壤C org存量没有显着差异(分别为185±13和202±13 Mg C org  ha -1)。与海洋(57%)相比,潮汐沼泽和滨上植被在河流(80%)和中层(76%)的贡献更大,这进一步解释了土壤碳的差异组织股票。西澳大利亚温带潮汐沼泽地(约3000 km 2范围内的57 Tg C org)的估计土壤C org储量约占全球潮汐沼泽C org储量的2%。所获得的结果确定了潮汐沼泽中土壤C org储存的全球驱动力,并且可以根据潮汐沼泽的保护作用,将热点地区用于缓解气候变化。

更新日期:2020-06-25
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