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首页> 外文期刊>Estuarine Coastal and Shelf Science >Sedimentary Nutrient Dynamics In A Tropical Estuarine Mangrove Ecosystem
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Sedimentary Nutrient Dynamics In A Tropical Estuarine Mangrove Ecosystem

机译：热带河口红树林生态系统中的沉积营养动态

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Mangrove sediments play a pivotal role in the nutrient biogeochemical processes by behaving as both source and sink for nutrients and other materials. Surface and core sediments were collected from various locations of the Pichavaram mangrove (India) and analyzed for grain size distribution, nutrients and stable N isotope (δ~(15)N) signatures in order to understand the spatial and vertical distribution of nutrients and biogeochemical processes of the C, N, P and S in this ecosystem. Sand is the dominant fraction followed by silt and clay. Spatial distribution of nutrients is controlled by the external and internal loadings, whereas vertical distribution is largely driven by the in situ microbial activities. Interior mangrove sediments contain higher concentrations of organic carbon (OC) than the estuarine sediments reflecting high rates of organic matter retention. Finer fractions of sediment hold ～60% OC due to high surface area. At some sampling points, moderately high δ~(15)N signatures were observed and this may be because of agricultural runoff and aquaculture effluents.
机译：红树林沉积物表现为养分和其他物质的源和汇，在养分生物地球化学过程中起着关键作用。从印度Pichavaram红树林的各个位置收集表面和核心沉积物，并分析其粒度分布，养分和稳定的N同位素（δ〜（15）N）特征，以了解养分和生物地球化学的空间和垂直分布这个生态系统中C，N，P和S的过程沙子是主要成分，其次是淤泥和粘土。营养物的空间分布受外部和内部负荷控制，而垂直分布在很大程度上受原位微生物活动驱动。红树林内部的沉积物比河口沉积物含有更高的有机碳（OC）浓度，反映出有机物的保留率很高。由于较高的表面积，较细的沉淀物拥有约60％的OC。在某些采样点，观测到较高的δ〜（15）N信号，这可能是由于农业径流和水产养殖废水造成的。

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