DOI: 10.1007/s10533-014-0062-3
Scopus记录号: 2-s2.0-84925513561
论文题名: Effects of nitrogen and phosphorus load reduction on benthic phosphorus release in a riverine lake
作者: Grüneberg B. ; Dadi T. ; Lindim C. ; Fischer H.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 123, 期: 2018-01-02 起始页码: 185
结束页码: 202
语种: 英语
英文关键词: Benthic chamber
; Diffusive flux
; Nitrate
; P budget
; P pool
; Temporary storage
英文摘要: The Lower Havel in Berlin is a polymictic riverine lake, thermally stratified for some days or weeks in summer. It is characterized by a relatively high mean total phosphorus concentration (145 µg l−1) and frequent cyanobacteria mass development in summer. We quantified the potentially mobile P pool in sediments, determined P fluxes based on conventional dialysis sampler-, gel probe- and benthic chamber measurements, and combined this with column experiments and P budget calculations to evaluate whether a) a reduction of P loading would be counterbalanced by P release from sediment, and b) release of redox sensitive P would even increase with reduction of nitrogen loading. The potentially mobile P pool was relatively small (228 t) compared to mean annual external load (190 t a−1) and gross P release (1.2–36 mg m−2 day−1), and was thus of little relevance for long-term P availability. Despite 38 % of P in the sediment being redox sensitive, the seasonal course of P gross release was mainly driven by redox independent organic matter mineralization of diagenetically young surface sediment. Under anoxic conditions, P release was higher than under oxic conditions and to some extent controlled by nitrate under laboratory conditions. However, ambient nitrate availability was too low to affect P release which was more dependent on mineralization and Fe availability than on redox. Therefore, the Lower Havel would benefit from P load reduction but internal P loading would be largely unaffected from further N load reduction. © 2014, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83559
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Brandenburg University of Technology Cottbus–Senftenberg, Seestr. 45, Bad Saarow, Germany; Helmholtz Centre for Environmental Research, Brückstraße 3a, Magdeburg, Germany; Federal Institute of Hydrology, Am Mainzer Tor 1, Koblenz, Germany; ITM - Department of Applied Environmental Science, Stockholm University, Svante Arrhenius väg 8, Stockholm, Sweden
Recommended Citation:
Grüneberg B.,Dadi T.,Lindim C.,et al. Effects of nitrogen and phosphorus load reduction on benthic phosphorus release in a riverine lake[J]. Biogeochemistry,2015-01-01,123(2018-01-02)