Does ectomycorrhiza have a universal key role in the formation of soil organic matter in boreal forests?

Does ectomycorrhiza have a universal key role in the formation of soil organic matter in boreal forests?

12 páginas.- 8 figuras.- 1 tabla.- 80 referencias.- Supplementary data to this article can be found online at https://doi. org/10.1016/j.soilbio.2019.107635

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Main Authors: Högberg, Mona N., Skyllberg, Ulf, Peter Högberg, Knicker, Heike
Other Authors: Swedish Research Council
Format: artículo biblioteca
Language:English
Published: Elsevier 2020-01
Subjects:Boreal forest, Ectomycorrhizal fungi, N-15, C-13 NMR, N-15 NMR, SOM formation, C-13,
Online Access:http://hdl.handle.net/10261/197455
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spelling dig-irnas-es-10261-1974552020-01-10T13:27:34Z Does ectomycorrhiza have a universal key role in the formation of soil organic matter in boreal forests? Högberg, Mona N. Skyllberg, Ulf Peter Högberg Knicker, Heike Swedish Research Council Swedish Research Council Högberg, Mona N. [0000-0003-1258-7630] Skyllberg, Ulf [0000-0001-6939-8799] Knicker, Heike [0000-0002-0483-2109] Boreal forest Ectomycorrhizal fungi N-15 C-13 NMR N-15 NMR SOM formation C-13 12 páginas.- 8 figuras.- 1 tabla.- 80 referencias.- Supplementary data to this article can be found online at https://doi. org/10.1016/j.soilbio.2019.107635 Forest soil organic matter (SOM) is an important dynamic store of C and N, which releases plant available N and the greenhouse gases CO2 and N2O. Early stages of decomposition of recent plant litters are better known than the formation of older and more stable soil pools of N and C, in which case classic theory stated that selective preservation of more resistant plant compounds was important. Recent insights heighten that all plant matter becomes degraded and that older SOM consists of compounds proximally of microbial origin. It has been proposed that in boreal forests, ectomycorrhizal fungi (ECMF), symbionts of trees, are actively involved in the formation of slowly-degrading SOM. We characterized SOM in the mor-layer along a local soil N supply gradient in a boreal forest, a gradient with large variations in chemical and biological characteristics, notably a decline in the biomass of ECMF in response to increasing soil N supply. We found contrasting and regular patterns in carbohydrates, lignin, aromatic carbon, and in N-containing compounds estimated by solid-state C-13 and N-15 nuclear magnetic resonance (NMR) spectroscopy. These occurred along with parallel changes in the natural abundances of the stable isotopes C-13 and N-15 in both bulk SOM and extracted fractions of the SOM. The modelled "bomb-C-14" age of the lower layers studied ranged between 15 years at the N-poor end, to 70 years at the N-rich end of the gradient. On average half the increase in delta C-13 with soil depth (and hence age) of the mor-layer can be attributed to soil processes and the other half to changes in the isotopic composition of the plant C inputs. There was a decrease in carbohydrates (O-alkyl C) with increasing depth. This supports the classical hypothesis of declining availability of easily decomposable substrates to microorganisms with increasing soil depth and age. The observed increase in delta C-13 with depth, however, speaks against the idea of selective preservation of more resistant plant compounds like lignin. Furthermore, from the N-poor to the N-rich end the difference between N-15 in plant litter N and N in the deeper part of the mor-layer, the H-layer, decreased in parallel with a decline in ECMF. The latter provides evidence that the role of ECMF as major sink for N diminishes, and hence their potential role in SOM stabilization, when the soil N supply increases. At the N-rich end, where bacteria dominate over fungi, other agents than ECMF must be involved in the large build-up of the H-layer with the slowest turnover rate found along the gradient. This work was supported by The Swedish Research Council Formas (2016-01658), The Swedish Research Council (621-2014-5356), and the Swedish University of Agricultural Sciences (KoN grants). Peer reviewed 2020-01-07T13:06:58Z 2020-01-07T13:06:58Z 2020-01 artículo http://purl.org/coar/resource_type/c_6501 Soil Biology and Biochemistry (140): 107635 (2020) 0038-0717 http://hdl.handle.net/10261/197455 10.1016/j.soilbio.2019.107635 en Publisher's version http://dx.doi.org/10.1016/j.soilbio.2019.107635 Sí open Elsevier
institution IRNAS ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-irnas-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del IRNAS España
language English
topic Boreal forest
Ectomycorrhizal fungi
N-15
C-13 NMR
N-15 NMR
SOM formation
C-13
Boreal forest
Ectomycorrhizal fungi
N-15
C-13 NMR
N-15 NMR
SOM formation
C-13
spellingShingle Boreal forest
Ectomycorrhizal fungi
N-15
C-13 NMR
N-15 NMR
SOM formation
C-13
Boreal forest
Ectomycorrhizal fungi
N-15
C-13 NMR
N-15 NMR
SOM formation
C-13
Högberg, Mona N.
Skyllberg, Ulf
Peter Högberg
Knicker, Heike
Does ectomycorrhiza have a universal key role in the formation of soil organic matter in boreal forests?
description 12 páginas.- 8 figuras.- 1 tabla.- 80 referencias.- Supplementary data to this article can be found online at https://doi. org/10.1016/j.soilbio.2019.107635
author2 Swedish Research Council
author_facet Swedish Research Council
Högberg, Mona N.
Skyllberg, Ulf
Peter Högberg
Knicker, Heike
format artículo
topic_facet Boreal forest
Ectomycorrhizal fungi
N-15
C-13 NMR
N-15 NMR
SOM formation
C-13
author Högberg, Mona N.
Skyllberg, Ulf
Peter Högberg
Knicker, Heike
author_sort Högberg, Mona N.
title Does ectomycorrhiza have a universal key role in the formation of soil organic matter in boreal forests?
title_short Does ectomycorrhiza have a universal key role in the formation of soil organic matter in boreal forests?
title_full Does ectomycorrhiza have a universal key role in the formation of soil organic matter in boreal forests?
title_fullStr Does ectomycorrhiza have a universal key role in the formation of soil organic matter in boreal forests?
title_full_unstemmed Does ectomycorrhiza have a universal key role in the formation of soil organic matter in boreal forests?
title_sort does ectomycorrhiza have a universal key role in the formation of soil organic matter in boreal forests?
publisher Elsevier
publishDate 2020-01
url http://hdl.handle.net/10261/197455
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