Yu Xiao-Qing, Yang Jun, Liu Le-Mian, Tian Yuan, Yu Zheng, Wang Chang-Fu
Aquatic Ecohealth Group, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Huan Jing Ke Xue. 2012 Nov;33(11):3739-47.
To reveal the spatial distribution of biogenic elements and their influencing factors in the typical subtropical coastal wetland, both surface and core sediment samples were collected from the Jiulong River Estuary, southeast China in summer 2009. The biogenic elements including carbon, nitrogen, phosphorus, sulfur (C, N, P, S) were determined by Element Analyzer and Flow Injection Analyzer. The concentrations of TC, TN, TP, and TS were (12.64 +/- 2.66) g x kg(-1), (1.57 +/- 0.29) g x kg(-1), (0.48 +/- 0.06) g x kg(-1), and (2.61 +/- 1.37) g x kg(-1), respectively. Further, these biogenic elements showed a distinct spatial pattern which closely related with the vegetation type and tide level. Values of TC, TN, TP in the surface sediment of mangrove vegetation zones were higher than those in the cord-grass and mudflat zones, while TC, TN, TP concentrations in the high tide level regions were higher than those in the middle and low tide level regions. The TS concentration was the highest in cord-grass vegetation and middle tidal level zones. The TC and TN values in sedimentary core decreased gradually with depth, and they were the highest in the mangrove sites, followed by cord-grass and mudflat sites at the same depth. In mudflat sedimentary core, the average content of TP was the lowest, whereas TS was the highest. Redundancy analysis revealed that vegetation type, pH and tide level were the main factors influencing the distribution of biogenic elements in surface sediments of the Jiulong River Estuary, by explaining 24.0%, 19.0% and 11.6% of total variation in the four biogenic elements (C, N, P and S), respectively.
为揭示典型亚热带海岸湿地生源要素的空间分布及其影响因素，2009年夏季在中国东南部九龙江河口采集了表层和柱状沉积物样本。采用元素分析仪和流动注射分析仪测定了碳、氮、磷、硫（C、N、P、S）等生源要素。总碳（TC）、总氮（TN）、总磷（TP）和总硫（TS）的浓度分别为（12.64±2.66）g·kg⁻¹、（1.57±0.29）g·kg⁻¹、（0.48±0.06）g·kg⁻¹和（2.61±1.37）g·kg⁻¹。此外，这些生源要素呈现出明显的空间格局，与植被类型和潮位密切相关。红树林植被区表层沉积物中TC、TN、TP的值高于互花米草和泥滩区，而高潮位区域的TC、TN、TP浓度高于中潮位和低潮位区域。TS浓度在互花米草植被和中潮位区最高。柱状沉积物中的TC和TN值随深度逐渐降低，在相同深度下，红树林站点的值最高，其次是互花米草和泥滩站点。在泥滩柱状沉积物中，TP的平均含量最低，而TS最高。冗余分析表明，植被类型、pH值和潮位是影响九龙江河口表层沉积物中生源要素分布的主要因素，分别解释了四种生源要素（C、N、P和S）总变异的24.0%、19.0%和11.6%。
