The effect of benthic algae on phosphorus exchange between sediment and overlying water in shallow lakes: a microcosm study using 32P as a tracer
The effect of benthic algae on phosphorus exchange between sediment and overlying water in shallow lakes: a microcosm study using 32P as a tracer
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底栖藻类对浅湖沉积物与上覆水体磷交换的影响：以 32P 作为示踪剂的微观研究
DOI：
10.1007/s10750-012-1134-9
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发表时间：
2013-06
期刊：
影响因子：
2.6
通讯作者：
Zhang XF, Liu ZW, Gulati RD, Jeppesen E
中科院分区：
文献类型：
--
作者：
Zhang XF, Liu ZW, Gulati RD, Jeppesen E
沉积物在确定浅水湖泊中的营养水平方面至关重要，因为它们可以作为磷（P）的源或汇，这取决于环境条件，沉积物特征和外部营养负荷。以32 P为示踪剂，研究了底栖藻类在沉积物-上覆水磷循环中的作用。沉积物和水样采集自惠州西湖，一个浅，富营养化水体位于中国南方惠州市。将实验室培养的底栖藻类转移到管中的沉积物芯上。当32 P添加到水中的实验管含有沉积物芯与底栖藻类，48 h后的32 P活性显着降低，在管与藻类，表明底栖藻类去除P从上覆水。当示踪剂注入沉积物中时，有底栖藻类覆盖的沉积物水体中的~（32）P活性显著低于裸沉积物水体中的~（32）P活性，表明底栖藻类减少了沉积物P的释放。因此，我们推测藻类产生的氧气有助于抑制沉积物中磷的释放。我们的研究表明，底栖藻类能够降低沉积物上覆的水中的P水平，这表明在贫光条件引发的富营养化过程中底栖藻类的损失可能会加速浅水湖泊从清澈的水到浑浊的状态的转变。
Sediments are of key importance in determining the nutrient levels of water in shallow lakes as they can act as either source or sink for phosphorus (P) depending on environmental conditions, sediment characteristics, and external nutrient loading. We examined the role of benthic algae in the P cycling between sediment and overlying water in experiments using 32P as a tracer. Sediment and water samples were collected from Huizhou West Lake, a shallow, eutrophic waterbody located in Huizhou City, South China. Laboratory cultured benthic algae were transferred to cover the sediment core in tubes. When 32P was added to the water in experimental tubes containing sediment cores with and without benthic algae, 32P activity after 48 h was significantly lower in the tubes with algae, indicating that benthic algae removed P from the overlying water. When the tracer was injected into the sediment, 32P activity in the water overlying sediment with benthic algae was substantially lower than in tubes with naked sediment, suggesting that benthic algae reduce the release of sediment P. Oxygen levels were significantly higher in the upper 3 mm of the sediments covered by benthic algae; thus, we hypothesized that oxygen produced by the algae helps inhibit the release of P from the sediment. Our study demonstrates that benthic algae are capable of reducing P levels in water overlying the sediment, suggesting that loss of benthic algae during eutrophication triggered by impoverished light conditions may accelerate the shift in shallow lakes from a clear water to a turbid state.
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影响因子：
4.5
作者：
R. Timms;B. Moss
通讯作者：
R. Timms;B. Moss
影响因子：
5.5
作者：
Mortimer, CH
通讯作者：
Mortimer, CH
影响因子：
4.5
作者：
R. Carlton;R. Wetzel
通讯作者：
R. Carlton;R. Wetzel
DOI：
10.1007/978-1-4612-0695-8
发表时间：
1998
期刊：
--
影响因子：
--
作者：
E. Jeppesen
通讯作者：
E. Jeppesen
影响因子：
2.7
作者：
BLINDOW, I;ANDERSSON, G;JOHANSSON, S
通讯作者：
JOHANSSON, S