The role of salt marsh structure in the distribution of surface sedimentary organic matter

The role of salt marsh structure in the distribution of surface sedimentary organic matter
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盐沼结构在表层沉积有机质分布中的作用

DOI:
10.1007/s12237-015-9957-z
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发表时间:
2015
影响因子:
2.7
通讯作者:
Miguel A. Goñi
Miguel A. Goñi
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Si Chen;Raymond Torres;Miguel A. Goñi

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本研究探讨了sedimentary.organic物质(OM)的空间变异性。共分析了来自0.5平方公里盐沼岛的两个横断面的25个表面沉积物样本;一个横断面穿越相对古老的沼泽,另一个横断面穿越新旧沼泽的混合体。我们使用海拔和距溪头的距离作为地貌代用指标,并将它们与有机组分的丰度(碳,氮)和同位素/分子组成(即,木质素)。统计学上显着的线性相关性之间观察。海拔和距离与OM。含量的小溪头,这表明可能的地貌影响。然而,这一趋势对旧沼泽是积极的,对the.new沼泽是消极的。因此,在堤坝或堤坝附近的沉积物取样可引起OM含量相差5-8倍。此外,在有机质的种源中,观察到相反的趋势,老沼泽具有较大的海藻或外来有机质的贡献,而新沼泽具有主要的本地有机质特征。此外,这些数据还揭示了两个尺度的有机质含量和组成的变化,一个在~101米,另一个在~103米。101米尺度的变化主要是由于盐沼地貌结构的影响,而103米尺度的变化则可能与当地营养物质输入和有机质保存的差异以及不同地点的沉积物、来源和积累速率和过程有关。
This study examines spatial variability in sedimentary.organic matter (OM). A total of 25 surface sediment samples.were analyzed from two transects across a 0.5-km2 salt.marsh island; one transect traverses relatively old marsh and.the other a mix of old and new marsh. We use elevation and.distance to creek head as geomorphic proxies and associate.them with the abundance (carbon, nitrogen) and the isotopic/.molecular composition of organic constituents (i.e., lignin)..Statistically significant linear correlations were observed between.elevation and distance from the creek head with OM.content, suggesting a likely geomorphic influence. However,.the trend was positive for the older marsh and negative for the.new marsh. Hence, sediment sampling at or near levees can.give rise to a factor of 5–8 difference in OM content. Also,.opposing trends were observed in OM provenance with old.marsh having greater contributions of marine algae or allochthonous.OM and new marsh having a predominantly autochthonous.OMsignature. Further, these data reveal two scales of.variability inOM content and composition, one at ~101 m and.the other at ~103 m. We ascribe the 101-m scale variability to.the effect of salt marsh geomorphic structure, while the 103-m.scale variability is likely related to the differences in local.nutrient input and OM preservation and due to sediment.source and accumulation rates and processes between sites.
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