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Indications that lo...
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Rappe George, MartinSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
(författare)
Indications that long-term nitrogen loading limits carbon resources for soil microbes
- Artikel/kapitelEngelska2017
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LIBRIS-ID:oai:gup.ub.gu.se/259618
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https://gup.ub.gu.se/publication/259618URI
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https://doi.org/10.1016/j.soilbio.2017.07.015DOI
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https://res.slu.se/id/publ/88800URI
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Microbial communities in the organic horizon (O-horizon) of forest soils play key roles in terrestrial nitrogen (N) cycling, but effects on them of long-term high N loading, by N deposition or experimental addition, are not fully understood. Thus, we investigated N-loading effects on soil microbial biomass N, carbon (C) and phosphorus stoichiometry, hydrolytic and oxidative enzymes, community composition (via phospholipid fatty acids, PLFA) and soil chemistry of the O-horizon in study plots of three well-studied experimental Norway spruce (Picea abies) forests in Sweden and the Czech Republic. These forests span substantial gradients in current N deposition, experimental N addition and nitrate (NO3 −) leaching. Current N deposition ranges from ∼3 kg ha−1 year−1 of N in central Sweden (Stråsan) to ∼15 kg ha−1 year−1 of N in SW Sweden (Skogaby) and Czech Republic (Čertovo). Furthermore, accumulated historical N loading during 1950–2000 (which include experimental N addition performed at Stråsan and Skogaby) ranged ∼200–∼2000 kg ha−1 of N. Across all sites and treatments, current NO3 − leaching ranged from low (∼0.1 kg ha−1 year−1 of N) at Stråsan, to high (∼15 kg ha−1 year−1 of N) at Skogaby and Čertovo. We found significantly lower C/N ratios and greater amounts of extractable inorganic N species in the forest soils’ O-horizons at the high N loading plots. Microbial biomass and basal respiration decreased under experimental N addition treatments and tended to decrease with increased N deposition. Similarly, activities of hydrolytic enzyme activity associated with N acquisition were lower, although differences in activities at specific sites with the highest and intermediate historical N deposition levels failed statistical significance. Conversely, activities of soil hydrolytic enzymes associated with C acquisition were greater in study plots exposed high N loading. PLFA profiles indicated shifts in microbial community composition induced by long-term N load, towards higher and lower relative abundance of Gram-positive and Gram-negative bacteria, respectively (but no changes in fungal relative abundance). Taken together, our results suggest that long-term N loading of N-limited Norway spruce forests aggravates limitation of other resources, likely of C, for soil microbial communities. Although microbial variables in the soil O-horizon differed between plots exposed to low and high current N loading, microbial variables in plots that leached small amounts and large amounts of NO3 − exposed to high N load were similar. © 2017
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Choma, M.
(författare)
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Capek, PetrUniversity of South Bohemia in České Budějovice(Swepub:slu)96420
(författare)
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Börjesson, GunnarSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment(Swepub:slu)49477
(författare)
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Kaštovská, E.
(författare)
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Santruckova, HanaUniversity of South Bohemia in České Budějovice(Swepub:slu)97544
(författare)
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Gärdenäs, Annemieke I.,1962Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences,Institutionen för mark och miljö,Department of Soil and Environment(Swepub:slu)51161
(författare)
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Sveriges lantbruksuniversitetInstitutionen för mark och miljö
(creator_code:org_t)
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Sveriges lantbruksuniversitet
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Ingår i:Soil Biology and Biochemistry: Elsevier BV115, s. 310-3210038-07171879-3428
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