The spatial and temporal dynamics of sediment phosphorus attenuation and release in impacted stream catchments

Li, S.; Arnscheidt, J.; Cassidy, R.; Douglas, R.W.; McGrogan, H.J.; Jordan, P.

doi:10.1016/j.watres.2023.120663

Cited by 6 publications

(1 citation statement)

References 49 publications

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“…The sediment-water interface is a boundary environment that varies widely in its physical, chemical, and biological characteristics. − The biogeochemical cycling of P and other nutrient elements between the overlying water, interstitial water, and sediments is particularly important because it controls the material balance, form transformation, and sedimentary profile distribution of P between the overlying water and sediment. , Sediment disturbance and interstitial water diffusion are two important processes that influence the release of P from lake sediments into the overlying water. − The processes that occur in the sediment–water interface and which involve interstitial water as an intermediate medium have a significant impact on the migration, transformation, and biogeochemical processes of endogenous P in lakes. Therefore, knowledge of the processes involved could lead to a deeper understanding of P cycling in lakes. − For example, the release of dissolved reactive P (DRP) from interstitial water to the water column via the sediment–water interface is an important pathway for P release.…”

Section: Introductionmentioning

confidence: 99%

The Forms of Phosphorus in Sediments of Large Lakes (Poyang Lake) and Its Impact on Endogenous Release

Liu,

Xiao,

Yin

et al. 2024

ACS EST Water

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The release and retention of phosphorus (P) in sediments play a crucial role in determining whole-system P dynamics and balance in eutrophic lakes. Using Poyang Lake (China's largest freshwater lake) as a subject for a case study, we performed field investigations and collected data on specific P forms in the overlying water, interstitial water, and sediment phases. The vertical concentration variations of the aforementioned P forms in the columnar sediment of Poyang Lake reflect distinct surface enrichment characteristics, primarily attributed to external P inputs. The average flux of dissolved total P at the monitored sites was 0.49 mg/(m 2 •d), and the estimated P release from Poyang Lake to the overlying water was 447.13−587.7 t/a, which is comparable to the release from typical eutrophic lakes in China. Sediment P release serves as a significant P source for interstitial water and plays a crucial role in the upward release of dissolved IP (interstitial water) from the overlying water. Fe−P (accounting for 47.07% of TP) is the P form in Poyang Lake sediments that is most involved in the migration and transformation process, with a large amount of activated P being transformed into Fe−P and released into the overlying water.

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