Factors influencing release of phosphorus from sediments in a high productive polymictic lake system
Factors influencing release of phosphorus from sediments in a high productive polymictic lake system
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DOI：
10.2166/wst.2009.445
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发表时间：
2009-01-01
影响因子：
2.7
通讯作者：
Wanganeo, A.
中科院分区：
文献类型：
--
作者：
Solim, S. U.;Wanganeo, A.
印度达尔湖是一个多组分超富营养化湖泊，其底部沉积物的磷释放速率很高（20.6 mg/m2/天）。这些总释放率仅在夏季的72天内发生。同样，从质量平衡估计得到11.3吨的净内部负荷。重要比例，即，类似于287.3吨/年的硝酸盐氮（NO（3）-N）负荷的80%通过反硝化作用消除或在3.2 kg/m2 f.w.的高大型植物生物量中被短期截留，最终被分解，氮（N）被释放出来。这些过程导致湖水中NO（3）-N浓度较低，可能影响沉积物磷（P）释放。特别是当沃茨中的硝态氮（NO3-N）< 500 μ g/L时，磷的浓度较高。还观察到磷的显著增加与温度和pH值有关，并且似乎磷和氨氮（NH（4）-N）的释放取决于丰富的有机物储量（893吨d.w.）的分解。在表层10厘米的底部沉积层中）。湖磷浓度显着预测的多元回归模型开发的湖泊。这项研究描述了各种湖泊水变量的意义，从底部沉积物中释放磷。
Phosphorus (P) release rates from bottom sediments are high (20.6 mg/m(2)/day) in Dal Lake (India), a polymictic hyper-eutrophic lake. These gross release rates occur over a period of 72 days during summer only. Likewise, a net internal load of 11.3 tons was obtained from mass balance estimates. Significant proportion i.e., similar to 80% of 287.3 tons/yr of nitrate nitrogen (NO(3)-N) load is either eliminated by denitrification or gets entrapped for a short period in high macrophyte biomass of 3.2 kg/m(2) f.w., which eventually get decomposed and nitrogen (N) is released back. These processes result in low lake water NO(3)-N concentrations which potentially influence sediment phosphorus (P) release. Especially, nitrate nitrogen (NO(3)-N) < 500 mu g/L in the lake waters were associated with high P concentrations. Phosphorus was also observed to increase significantly in relation to temperature and pH, and it seems likely that release of phosphorus and ammonical nitrogen (NH(4)-N) depend on decomposition of rich reserves of organic matter (893 tons d.w. in superficial 10-cm bottom sediment layer). Lake P concentrations were significantly predicted by a multivariate regression model developed for the lake. This study describes significance of various lake water variables in relation to P-release from bottom sediments.