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首页> 外文期刊>Estuarine Coastal and Shelf Science >Influence of seasonal variation and anthropogenic activity on phosphorus cycling and retention in mangrove sediments: A case study in China
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Influence of seasonal variation and anthropogenic activity on phosphorus cycling and retention in mangrove sediments: A case study in China

机译：季节变化和人为活动对红树林沉积物中磷循环和保留的影响：以中国为例

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摘要

Mangroves are known for sequestering and storing large quantities of phosphorus (P) within their sediments. In the present study, the sediment P cycle (including phosphatase activity intensity, total sedimentary P, P fractions distinguished by a sequential extraction method, as well as diffusion adsorption processes) in a mangrove swamp in a subtropical estuary in China was studied. In the spring, the acid phosphatase activity varied between 1.3 and 1.9 units in the four sites in the estuary. The activity of alkaline phosphatase varied from 0.8 to 1.4 units. The total sedimentary P ranged from 821 to 1689 mg kg(-1) with a dominance of redox-sensitive (Fe/Al bound) P. In the autumn, activities of both phosphatases and the total sediment P amount increased, probably due to enhanced inputs of organic matter and Fe oxides. In addition to seasonal variation, P in the mangrove sediment was influenced by anthropogenic activities. In particular, redox-sensitive P decreased significantly while phosphatase activity increased in the site that was flushed with aquaculture pond effluents. In contrast, sediment P enrichment was observed in the site that received domestic sewage. Both sources of anthropogenic P increased the eutrophication risk of the mangrove sediment because of a decrease in the amount of P adsorption and an enhancement of P release via diffusion. Diesel contamination due to the presence of a dock depressed phosphatase activity in the surficial sediment. The overlap between seasonal rhythm and human influences may introduce significant variations in P cycling, which warrants further attention from coastal management. (C) 2018 Elsevier Ltd. All rights reserved.
机译：红树林因在其沉积物中隔离和存储大量磷（P）而闻名。在本研究中，研究了中国亚热带河口红树林沼泽中的沉积物P循环（包括磷酸酶活性强度，总沉积P，P馏分（通过顺序提取方法加以区分）以及扩散吸附过程）。在春季，河口四个部位的酸性磷酸酶活性在1.3和1.9个单位之间变化。碱性磷酸酶的活性从0.8到1.4个单位不等。沉积物P的总含量在821至1689 mg kg（-1）之间，对氧化还原敏感的P（Al / Al结合）P占优势。秋天，磷酸酶的活性和沉积物P的总量均增加了，这可能是由于增强了有机物和氧化铁的投入。除季节性变化外，红树林沉积物中的磷还受到人为活动的影响。特别是，在被水产养殖池塘污水冲洗的部位，氧化还原敏感的P显着降低，而磷酸酶活性增加。相反，在接收生活污水的地方观察到了沉积物P的富集。两种人为来源的P均增加了红树林沉积物的富营养化风险，因为P吸附量的减少和P扩散通过扩散的方式增加。由于船坞沉积物中磷酸酯酶活性的降低导致柴油污染。季节节律和人为影响之间的重叠可能会导致磷循环的显着变化，这需要海岸管理部门的进一步关注。 （C）2018 Elsevier Ltd.保留所有权利。

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