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For understanding the effects of iron and sulfur redox processes and overlying water hypoxia on phosphorus remobilization and liberation in intertidal sediments, the coastal zone in Xiang’an, Xiamen was selected to conduct continuous sampling and monitoring for sediments, pore water and overlying water in one year by employing the in-situ high resolution sampling techniques. Results showed that hypoxia and excessive phosphorus content were severe in the overlying water, which were below 2 mg/L and above 0.06 mg/L in most months, respectively. On the vertical profile, the distribution trend of dissolved reactive phosphorus (SRP) content was consistent with that of dissolved iron content in pore water, while the distribution trend of DGT-labile P was consistent with that of DGT-labile S in local, demonstrating that the passivation and remobilization of phosphorus are mainly controlled by the redox process of iron, and locally controlled by the redox process of sulfur. However, deficiency of sediment phosphorus limits the content of phosphorus in the deep reduction zone. In terms of quarterly changes, SRP content in pore water is only consistent with SRP content in overlying water, which is attributed to the hypoxic sedimentary environment favoring the cross-boundary exchange of SRP. However, the superposition of a variety of environmental factors affects the spatiotemporal changes of SRP and DGT-labile P. The SRP content concentration gradient in surface pore water was not significant, that is, the phosphorus release risk was not significant, but the change of environmental factors is very easy to trigger the release of endogenous phosphorus in future.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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