Transformation of phosphorus species in settling seston and during early sediment diagenesis
Transformation of phosphorus species in settling seston and during early sediment diagenesis
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DOI：
10.1007/bf00878395
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发表时间：
1995-01-01
期刊：
影响因子：
2.4
通讯作者：
Giovanoli, R
中科院分区：
文献类型：
--
作者：
Hupfer, M;Gachter, R;Giovanoli, R
连续磷提取结合电子显微镜和X-射线能谱来鉴定各种P物种，并研究它们在沉降悬浮物和现代沉积物中的转化。在早期成岩作用期间，水中形成的颗粒磷大部分被再溶解。结果表明，沉积颗粒物中磷含量和磷通量的季节变化均在一个数量级以上，颗粒物在低湖沉降时富集还原性可溶性磷（BD-P），BD-P的变化与还原性可溶性铁（BD-Fe）的变化呈极显著正相关。在沉积过程中，有机磷、铁结合态磷和70%的铁结合态磷的含量基本不变，而锰和铁结合态磷的含量几乎没有变化。沉积物表层对磷的迁移没有明显的捕获作用，CaCO_3沉积对磷的沉积作用不大，但对磷的沉积作用显著。永久埋葬P。
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 thatthe phosphorus (P) content and the P flux of settling particles varied seasonally over one order of magnitudeparticles became enriched with reductant soluble P (BD-P) while settling through the hypolimnionchanges 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 concentrationother fractions including organic P did not change during sedimentationmost of the organic P and of the Fe bound P and 70 % of TP was released from the sediment during early diagenesisthe sediment surface did not act as a trap for P migrating upwards from deeper sediment layersCaCO3 sedimentation contributed little to P sedimentation but significantly to the permanent burial of P.