Transformation of phosphorus species in settling seston and during early sediment diagenesis期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Transformation of phosphorus species in settling seston and during early sediment diagenesis

Authors:

Institution:

1. Limnological Research Center, Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-6047, Kastanienbaum, Switzerland
3. Laboratory for Electron Microscopy, University of Bern, CH-3000, Bern 9, Freiestrasse 3, Switzerland

Abstract:

Sequential P extraction was combined with electron microscop and X-ray spectroscopy to characterise various P species and to study their transformation in settling seston and in recent sediment. During early diagenesis most of the particulate P formed in the water was redissolved. No net transformation into species that would resist dissolution was observed.It was shown that

•	the phosphorus (P) content and the P flux of settling particles varied seasonally over one order of magnitude
•	particles became enriched with reductant soluble P (BD-P) while settling through the hypolimnion
•	changes in BD-P were highly significantly correlated with changes in reductant soluble iron (BD-Fe)
•	bacteria oxidising Fe and Mn seemed to be mainly responsible for this increase in P concentration
•	other fractions including organic P did not change during sedimentation
•	most of the organic P and of the Fe bound P and 70% of TP was released from the sediment during early diagenesis
•	the sediment surface did not act as a trap for P migrating upwards from deeper sediment layers
•	CaCO₃ sedimentation contributed little to P sedimentation but significantly to the permanent burial of P.

Keywords:

Phosphorus fractionation EDXS sediment diagenesis phosphorus release settling seston Metallogenium

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