Nitrogen fixation associated with epiphytes on the seagrass Zostera marina in a temperate lagoon with moderate to high nitrogen loads
Nitrogen fixation associated with epiphytes on the seagrass Zostera marina in a temperate lagoon with moderate to high nitrogen loads
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中度至高氮负荷的温带泻湖中与大叶藻码头海草附生植物相关的固氮作用
DOI:
10.1007/s10533-023-01083-2
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发表时间:
2023
期刊:
影响因子:
4
通讯作者:
Berg, Peter
中科院分区:
文献类型:
--
作者:
Marino, Roxanne;Hayn, Melanie;Howarth, Robert W.;Giblin, Anne E.;McGlathery, Karen J.;Berg, Peter
As part of a long-term study on the effects of nitrogen (N) loading in a shallow temperate lagoon, we measured rates of N2fixation associated with seagrass (Zostera marina) epiphytes during the summer from 2005 to 2019, at two sites along a gradient from where high N groundwater enters the system (denoted SH) to a more well-flushed outer harbor (OH). The data presented here are the first such long-term N2fixation estimates for any seagrass system and one of the very few reported for the phyllosphere in a temperate system. Mean daily N2fixation was estimated from light and dark measurements using the acetylene reduction assay intercalibrated using both incorporation of15N2into biomass and a novel application of the N2:Ar method. Surprisingly, despite a large inorganic N input from a N-contaminated groundwater plume, epiphytic N2fixation rates were moderately to very high for a seagrass system (OH site 14-year mean of 0.94 mmol N m−2d−1), with the highest rates (2.6 mmol N m−2d−1) measured at the more N-loaded eutrophic site (SH) where dissolved inorganic N was higher and soluble reactive phosphorus was lower than in the better-flushed OH. Over 95% of the total N2fixation measured was in the light, suggesting the importance of cyanobacteria in the epiphyte assemblages. We observed large inter-annual variation both within and across the two study sites (range from 0.1 to 2.6 mmol N fixed m−2d−1), which we suggest is in part related to climatic variation. We estimate that input from phyllosphere N2fixation over the study period contributes on average an additional 20% to the total daily N load per area within the seagrass meadow.
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影响因子:
4.5
作者:
Aoki, Lillian R.;McGlathery, Karen J.;Oreska, Matthew P. J.
通讯作者:
Oreska, Matthew P. J.
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
P. Barrio;N. Ganju;A. Aretxabaleta;M. Hayn;Andrés García;R. Howarth
通讯作者:
R. Howarth
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
Catherine E. Wazniak;M. R. Hall;T. Carruthers;Brian Sturgis;W. Dennison;R. Orth
通讯作者:
R. Orth
DOI:
--
发表时间:
1972
期刊:
影响因子:
--
作者:
J. Goering;P. L. Parker
通讯作者:
P. L. Parker
影响因子:
2.5
作者:
N. Agawin;P. Ferriol;E. Sintes
通讯作者:
E. Sintes