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首页> 外文期刊>Estuarine Coastal and Shelf Science >Organic matter characterization in a tropical estuarine-mangrove ecosystem of India: Preliminary assessment by using stable isotopes and lignin phenols
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Organic matter characterization in a tropical estuarine-mangrove ecosystem of India: Preliminary assessment by using stable isotopes and lignin phenols

机译：印度热带河口-红树林生态系统中的有机物表征：使用稳定同位素和木质素酚的初步评估

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摘要

In order to characterize the sources and fate of organic matter (OM) in the Pichavaram estuarine-mangrove ecosystem (east coast of India), stable isotope (δ~(13)C and δ~(15)N) ratios and molecular lignin analyses were conducted in plant litter, benthic algae, sediment, paniculate matter and in a variety of benthic invertebrate species. The δ~(13)C signature of plant litter ranges from -29.75‰ to -27.64‰ suggesting that mangrove trees follow the C_3 photosynthetic pathway. Sedimentary δ~(13)C signature (-28.92‰ to -2534‰) demonstrates the greater influence of plant litter organic matter on sedimentary organic matter. Suspended particulate organic pool was influenced by terrestrial source and also seems to be influenced by the marine phytoplankton. Enriched signature of δ~(15)N in surface sediments (4.66-8.01‰; avg. 6.69‰) suggesting the influence of anthropogenic nitrogen from agricultural fields and human settlements. Spatial chemical variability in availability of nitrogen and plant associated microbial interactions demonstrate variability in δ~(15)N signature in mangrove plant litter. Two (lower and higher) trophic levels of invertebrates were identified with and observed > 4 ‰ gradient in δ~(13)C signal between these two trophic groups. The observed δ~(13)C values suggest that the lower level invertebrates feed on phytoplankton and higher level organisms have a mixed source of diet, phytoplankton, sediment and particulate organic matter. Lignin phenol analyses explain that the benthic surface layer was almost free of lignin. The ratio between syringyl phenols to vanillyl phenols (S/V) is 1.14-1.32 (avg. 1.23) and cin-namyl phenols to vanillyl phenols (C/V) is 0.17-0.31 (avg. 0.24), demonstrate non-woody angiosperm tissues was the major sources of lignin to this ecosystem, while aldehyde to acid ratios (Ad/Al) describe diagenetic nature of sediment and is moderately to less degraded. A two-end-member mixing model indicate that the terrigenous OM was dominant in the estuarine zones, while in the mangrove zone terrigenous supply accounts for 60% and marine input accounts for 40%.
机译：为了表征Pichavaram河口-红树林生态系统（印度东海岸）中有机物（OM）的来源和结局，采用稳定同位素比（δ〜（13）C和δ〜（15）N）和分子木质素分析在植物凋落物，底栖藻类，沉积物，圆锥状物质以及各种底栖无脊椎动物中进行。植物凋落物的δ〜（13）C特征值在-29.75‰至-27.64‰之间，表明红树林遵循C_3光合途径。沉积物δ〜（13）C特征（-28.92‰至-2534‰）表明植物凋落物有机质对沉积有机质的影响较大。悬浮颗粒有机池受到陆地来源的影响，似乎也受到海洋浮游植物的影响。表层沉积物中δ〜（15）N的富集特征（4.66-8.01‰；平均6.69‰）表明来自农田和人类住区的人为氮的影响。氮素有效性的空间化学变异性以及与植物相关的微生物相互作用证明了红树林植物凋落物中δ〜（15）N标记的变异性。在这两个营养族之间，在δ〜（13）C信号中发现了两个（较低和较高）无脊椎动物的营养水平，并观察到了> 4‰的梯度。观测到的δ〜（13）C值表明，低水平的无脊椎动物以浮游植物为食，高水平的生物具有饮食，浮游植物，沉积物和颗粒状有机质的混合来源。木质素酚分析表明，底层表面几乎不含木质素。丁香基酚与香草基酚的比率（S / V）为1.14-1.32（平均1.23），肉桂基苯酚与香草基酚的比率（C / V）为0.17-0.31（平均0.24），证明了非木质被子植物组织是该生态系统中木质素的主要来源，而醛酸比（Ad / Al）描述了沉积物的成岩性质，降解程度中等至较低。两端混合模型表明，河口区以陆源性有机质为主，而在红树林区，陆源性有机质占60％，海洋投入量占40％。

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