Abstract
Rising temperature causes a process of phosphorus release, which can be characterized well using phosphorus release rates (VP). The objective of the present study was to investigate the major factors affecting sediment phosphorus release rates through a wetland habitat simulation experiment. The results showed that the VP of different wetland sediments were different and changed with the order of W–R (river wetland) > W–L (lake wetland) > W–M (grassy marsh wetland) > W–A (reservoir wetland). The main driving factors which influenced sediment phosphorus flux velocity in the sediment–water interface were sediment B-SO42−, B-MBN and A-MBP content. Path analysis and determination coefficient analysis indicated the standard multiple regression equation for sediment phosphorus release rates in the sediment–water interface, and each main factor was Y = −0.105 + 0.096X1 + 0.275X2 − 0.010X3 (r = 0.416, p < 0.01, n = 144), where Y is sediment phosphorus release rates; X1 is sediment B-SO42− content; X2 is sediment B-MBN; and X3 is sediment A-MBP content. Sediment B-SO42−, B-MBN and A-MBP content and the interaction between them were the main factors affecting sediment phosphorus release rates in the sediment–water interface. Therefore, these results suggest that soil chemical properties and microbial activities likely play an important role in phosphorus release rates in the sediment–water interface. We hope to provide effective scientific management and control methods for relevant environmental protection departments.
Highlights
Eutrophication, caused by nutrient-rich inputs through both point-source discharges and non-point loading, threatens most freshwater bodies [1,2,3,4]
Both the sediments had lower soil organic carbon (SOC) content compared with the W–R
The W–R had a much lower total phosphorus (TP) content compared with the W–M
Summary
Eutrophication, caused by nutrient-rich inputs through both point-source discharges and non-point loading, threatens most freshwater bodies [1,2,3,4]. Environmental factors e.g., temperature [15], pH [16], redox potential [17], Eh [18], P concentration gradient [19] and hydrological conditions [20] in the sediment–water interface would affect P release processes and release rates [21]. The results from different sediments are sometimes not the same because P release processes and release rates are significantly affected by both the physical and chemical properties of the sediments [22,23,24,25,26]
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