dc.contributor.author
Abdallah, Khaled
dc.contributor.author
Stock, Svenja C.
dc.contributor.author
Heeger, Felix
dc.contributor.author
Koester, Moritz
dc.contributor.author
Nájera, Francisco
dc.contributor.author
Matus, Francisco
dc.contributor.author
Merino, Carolina
dc.contributor.author
Spielvogel, Sandra
dc.contributor.author
Gorbushina, Anna A.
dc.contributor.author
Kuzyakov, Yakov
dc.contributor.author
Dippold, Michaela A.
dc.date.accessioned
2023-04-20T11:35:11Z
dc.date.available
2023-04-20T11:35:11Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/39011
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-38727
dc.description.abstract
Plants and microorganisms, besides the climate, drive nitrogen (N) cycling in ecosystems. Our objective was to investigate N losses and N acquisition strategies along a unique ecosystem-sequence (ecosequence) ranging from arid shrubland through Mediterranean woodland to temperate rainforest. These ecosystems differ in mean annual precipitation, mean annual temperate, and vegetation cover, but developed on similar granitoid soil parent material, were addressed using a combination of molecular biology and soil biogeochemical tools. Soil N and carbon (C) contents, δ15N signatures, activities of N acquiring extracellular enzymes as well as the abundance of soil bacteria and fungi, and diazotrophs in bulk topsoil and rhizosphere were determined. Relative fungal abundance in the rhizosphere was higher under woodland and forest than under shrubland. This indicates toward plants' higher C investment into fungi in the Mediterranean and temperate rainforest sites than in the arid site. Fungi are likely to decompose lignified forest litter for efficient recycling of litter-derived N and further nutrients. Rhizosphere—a hotspot for the N fixation—was enriched in diazotrophs (factor 8 to 16 in comparison to bulk topsoil) emphasizing the general importance of root/microbe association in N cycle. These results show that the temperate rainforest is an N acquiring ecosystem, whereas N in the arid shrubland is strongly recycled. Simultaneously, the strongest 15N enrichment with decreasing N content with depth was detected in the Mediterranean woodland, indicating that N mineralization and loss is highest (and likely the fastest) in the woodland across the continental transect. Higher relative aminopeptidase activities in the woodland than in the forest enabled a fast N mineralization. Relative aminopeptidase activities were highest in the arid shrubland. The highest absolute chitinase activities were observed in the forest. This likely demonstrates that (a) plants and microorganisms in the arid shrubland invest largely into mobilization and reutilization of organically bound N by exoenzymes, and (b) that the ecosystem N nutrition shifts from a peptide-based N in the arid shrubland to a peptide- and chitin-based N nutrition in the temperate rainforest, where the high N demand is complemented by intensive N fixation in the rhizosphere.
en
dc.format.extent
14 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
microbial abundance
en
dc.subject
natural abundance of 15N
en
dc.subject
nitrogen fixation
en
dc.subject
nitrogen uptake
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften
dc.title
Nitrogen Gain and Loss Along an Ecosystem Sequence: From Semi-desert to Rainforest
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
817641
dcterms.bibliographicCitation.doi
10.3389/fsoil.2022.817641
dcterms.bibliographicCitation.journaltitle
Frontiers in Soil Science
dcterms.bibliographicCitation.originalpublishername
Frontiers Media S.A.
dcterms.bibliographicCitation.volume
2 (2022)
dcterms.bibliographicCitation.url
https://doi.org/10.3389/fsoil.2022.817641
refubium.affiliation
Biologie, Chemie, Pharmazie
refubium.affiliation
Geowissenschaften
refubium.affiliation.other
Institut für Geologische Wissenschaften / Fachrichtung Geochemie, Hydrogeologie, Mineralogie
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refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
2673-8619
refubium.resourceType.provider
DeepGreen