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Sediment phosphorus release sustains nuisance periphyton growth when nitrogen is not limiting:
Journal of Limnology ( IF 1.673 ) Pub Date : 2020-04-03 , DOI: 10.4081/jlimnol.2020.1913
Bradley J. Austin , Violet Eagle , Michelle A. Evans-White , J. Thad Scott , Brian E. Haggard

Nuisance periphyton growth influences the aesthetics, recreation, and aquatic life of waterbodies. Partners Lake is a shallow spring-fed lake in the headwaters of the Illinois River Watershed in Cave Springs, Arkansas, that experiences nuisance growth of periphyton (i.e., Spirogyra spp.) each year. The ratio of dissolved nitrogen (N ~5.0 mg L-1) and phosphorus (P ~0.030 mg L-1) in the lake water (N:P≥288), as well as nutrient limitation assays, suggests that periphyton growth should be P-limited. While the water column lacks sufficient P to promote growth, the sediments have the ability to release P to the overlying water; P-flux ranged from 1.63 mg m-2 d-1 to over 10 mg m-2 d-1, reaching final concentrations of 0.08 to 0.34 mg L-1. However, soluble reactive phosphorus concentrations were consistently at or below 0.030 mg L-1, in the lake, suggesting that the periphyton were likely immobilizing P as quickly as it was released from the sediments. In the lab, maximal periphyton growth (~30 to 35 mg m-2) occurred in the 0.10 to 0.25 mg L-1 P treatments, over a 6 day incubation period. Similar levels of growth occurred when lake sediments were the P source, suggesting P released from the sediments is sufficient to support nuisance algal growth. We need to begin managing the legacy P stored in the sediments, in addition to external P loads, because internal P can sustain nuisance periphyton biomass when N is not limiting.



中文翻译:

当氮不受限制时,沉积物磷的释放维持有害的浮游植物生长:

滋生性浮游植物的生长会影响水体的美观,娱乐和水生生物。合作伙伴湖是在伊利诺伊河流域洞泉,阿肯色州的源头浅春天哺养湖,是经验附生的滋扰性(即,水绵属)每年。湖泊水中的溶解氮(N〜5.0 mg L -1)和磷(P〜0.030 mg L -1)的比例(N:P≥288)以及营养限制试验表明,应将浮游植物生长P限制。尽管水柱缺乏足够的磷来促进生长,但沉积物却具有将磷释放到上层水中的能力。P-通量范围从1.63 mg m -2 d -1到超过10 mg m -2 d-1,最终浓度为0.08至0.34 mg L -1。但是,湖泊中的可溶性反应磷浓度始终保持在0.030 mg L -1或以下,这表明水生植物固着磷的速度与从沉积物中释放磷的速度一样快。在实验室中,在0.10至0.25 mg L -1中出现最大的水生植物生长(〜30至35 mg m -2在6天的潜伏期中进行P处理。当湖泊沉积物为磷源时,发生了相似的生长水平,这表明从沉积物中释放出的磷足以支持有害藻类的生长。除了外部P负荷外,我们还需要开始管理沉积物中残留的P,因为当N不受限制时,内部P可以维持有害的浮游植物生物量。

更新日期:2020-04-03
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