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首页> 外文期刊>Estonian Journal of Earth Sciences >Spatio-temporal variability of surface sediment phosphorus fractions and water phosphorus concentration in Lake Peipsi (Estonia/Russia)
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Spatio-temporal variability of surface sediment phosphorus fractions and water phosphorus concentration in Lake Peipsi (Estonia/Russia)

机译：百事可乐湖（爱沙尼亚/俄罗斯）的表层沉积物磷含量和水磷浓度的时空变化

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摘要

Spatial and temporal variations in the contents of total phosphorus and five P-fractions were investigated in the surface sediments of large and shallow Lake Peipsi (area 3555 km~2, mean depth 7.1 m) and compared with total phosphorus (TP), dissolved inorganic P (PO_4-P) and dissolved oxygen (O_2) concentration in the overlying water column. The aim of the study was to determine the relationships between the sediment P and water P concentration dynamics. Samples from the uppermost 10-cm layer of the sediment and water samples from surface and near-bottom layers were collected simultaneously at six monitoring stations twice a year (in March and August) from 2004 to 2009. The results indicated that the concentrations of different P-fractions in the studied sediments varied greatly. Total P in sediment ranged from 470 to 1400 mg kg~(-1) dry mass (DM), while the loosely bound (labile) P (NH_4Cl-P) was the smallest and the most variable fraction (range from 3.6 to 43 mg kg~(-1) DM). The metal oxide-bound P (NaOH-P) was also highly variable (range from 48 to 660 mg kg-1 DM), whereas the concentration of calcium-bound P (HCl-P) was relatively even (range from 300 to 550 mg kg~(-1) DM) in all the studied sediments. Redundancy analysis results revealed that different phosphorus fractions in sediment had statistically significant relationships with bottom-water variables like TP (in winter) and O_2 (in summer). Our results show that the oxygen conditions have deteriorated in the lake during the last decades, which may have enhanced the release of P from the sediments.
机译：研究了大而浅的Peipsi湖（面积3555 km〜2，平均深度7.1 m）的表层沉积物中总磷和5个P组分的时空变化，并与总磷（TP），溶解性无机盐进行了比较。 P（PO_4-P）和上层水柱中的溶解氧（O_2）浓度。该研究的目的是确定沉积物P和水P浓度动态之间的关系。从2004年至2009年，每年两次（分别在3月和8月）两次在六个监测站同时收集最深10厘米沉积物层的样品和地表及近底层的水样品。研究沉积物中的P组分差异很大。沉积物中的总磷为470至1400 mg kg〜（-1）干重（DM），而松散结合的（不稳定的）P（NH_4Cl-P）最小，变化最大（3.6至43 mg） kg〜（-1）DM）。与金属氧化物结合的P（NaOH-P）也是高度可变的（范围为48至660 mg kg-1 DM），而与钙结合的P（HCl-P）的浓度相对均匀（范围为300至550） （mg kg〜（-1）DM））。冗余分析结果表明，沉积物中不同磷含量与底水变量（如TP（冬季）和O_2（夏季））具有统计上的显着关系。我们的结果表明，在过去的几十年中，湖中的氧气状况恶化了，这可能增加了沉积物中P的释放。

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