scholarly journals Nitrogen dynamics of decomposing Scots pine needle litter depends on colonizing fungal species

2019 ◽  
Vol 95 (6) ◽  
Author(s):  
Preetisri Baskaran ◽  
Alf Ekblad ◽  
Laure N Soucémarianadin ◽  
Riitta Hyvönen ◽  
Jürgen Schleucher ◽  
...  
Keyword(s):  
Nitrogen Cycling ◽  
Scots Pine ◽  
Nitrogen Retention ◽  
Fungal Species ◽  
Nitrogen Dynamics ◽  
Plant Production ◽  
15N Tracer ◽  
Pine Needle ◽  
Fungal Community Composition ◽  
Needle Litter

ABSTRACT In boreal ecosystems plant production is often limited by low availability of nitrogen. Nitrogen retention in below-ground organic pools plays an important role in restricting recirculation to plants and thereby hampers forest production. Saprotrophic fungi are commonly assigned to different decomposer strategies, but how these relate to nitrogen cycling remains to be understood. Decomposition of Scots pine needle litter was studied in axenic microcosms with the ligninolytic litter decomposing basidiomycete Gymnopus androsaceus or the stress tolerant ascomycete Chalara longipes. Changes in chemical composition were followed by 13C CP/MAS NMR spectroscopy and nitrogen dynamics was assessed by the addition of a 15N tracer. Decomposition by C. longipes resulted in nitrogen retention in non-hydrolysable organic matter, enriched in aromatic and alkylic compounds, whereas the ligninolytic G. androsaceus was able to access this pool, counteracting nitrogen retention. Our observations suggest that differences in decomposing strategies between fungal species play an important role in regulating nitrogen retention and release during litter decomposition, implying that fungal community composition may impact nitrogen cycling at the ecosystem level.

Nitrogen Level and Decomposition in Scots Pine Needle Litter

Oikos ◽  
1982 ◽  
Vol 38 (3) ◽  
pp. 291 ◽  
Author(s):  
Björn Berg ◽  
Bengt Wessén ◽  
Gunnar Ekbohm ◽  
Bjorn Berg ◽  
Bengt Wessen
Keyword(s):  
Scots Pine ◽  
Nitrogen Level ◽  
Pine Needle ◽  
Needle Litter

Accumulation and release of plant nutrients in decomposing Scots pine needle litter. Long-term decomposition in a Scots pine forest II

1982 ◽  
Vol 60 (8) ◽  
pp. 1561-1568 ◽  
Author(s):  
Håkan Staaf ◽  
Björn Berg
Keyword(s):  
Weight Loss ◽  
Scots Pine ◽  
Nutrient Dynamics ◽  
Pine Forest ◽  
Plant Nutrient ◽  
Pine Needle ◽  
Needle Litter ◽  
Scots Pine Forest ◽  
Net Release

Plant nutrient dynamics in decomposing needle litter were measured during a 5-year period in a Scots pine forest in central Sweden. As seen over the whole 5-year period, the nutrients were retained (to a litter weight loss of about 75%) in the order Mn < Ca < K < Mg < S < N < P. During the first 1.5 years there was a net increase of N and P whereafter a net release took place. A similar but less pronounced development could be seen for S, whereas Ca, K, Mn, and Mg were released from the start of the incubation. It is suggested that P was the most limiting element for microbial activity during this first phase. There appeared to be only little initial leaching from the litter and the different behaviours of the elements could largely be explained by their concentration in litter in relation to the needs of microorganisms and to their solubility. K and Mg were the elements that were released at rates most similar to organic matter weight loss.

Reduction of decomposition rates of scots pine needle litter due to heavy-metal pollution

1991 ◽  
Vol 59 (1-2) ◽  
Author(s):  
Bj�rn Berg ◽  
Gunnar Ekbohm ◽  
Bengt S�derstr�m ◽  
H�kan Staaf
Keyword(s):  
Heavy Metal ◽  
Scots Pine ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Pine Needle ◽  
Decomposition Rates ◽  
Needle Litter

An in situ mesocosm method for quantifying nitrogen cycling rates in oligotrophic wetlands using 15N tracer techniques

Wetlands ◽  
2008 ◽  
Vol 28 (2) ◽  
pp. 502-512 ◽  
Author(s):  
Jeffrey R. Wozniak ◽  
Daniel L. Childers ◽  
William T. Anderson ◽  
David T. Rudnick ◽  
Christopher J. Madden
Keyword(s):  
Nitrogen Cycling ◽  
15N Tracer ◽  
Tracer Techniques

Effects on Growth of Simulated and Induced Shoot Pruning by Tomicus piniperda as Related to Carbohydrate and Nitrogen Dynamics in Scots Pine

1985 ◽  
Vol 22 (1) ◽  
pp. 105 ◽  
Author(s):  
A. Ericsson ◽  
C. Hellqvist ◽  
B. Langstrom ◽  
S. Larsson ◽  
O. Tenow
Keyword(s):  
Scots Pine ◽  
Nitrogen Dynamics ◽  
Tomicus Piniperda

scholarly journals Seasonal Diversity of Arbuscular Mycorrhizal Fungi in Mangroves of Goa, India

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
James D’Souza ◽  
Bernard Felinov Rodrigues
Keyword(s):  
Species Richness ◽  
Mycorrhizal Fungi ◽  
Monsoon Season ◽  
Arbuscular Mycorrhizal ◽  
Fungal Spore ◽  
Fungal Species ◽  
Spore Density ◽  
Species Variation ◽  
Fungal Community Composition ◽  
Mangrove Plant

Seasonal dynamics of arbuscular mycorrhizal (AM) fungal community composition in three common mangrove plant species, namely, Acanthus ilicifolius, Excoecaria agallocha, and Rhizophora mucronata, from two sites in Goa, India, were investigated. In all three species variation in AM fungal spore density was observed. Maximum spore density and AM species richness were recorded in the premonsoon season, while minimum spore density and richness were observed during monsoon season at both sites. A total of 11 AM fungal species representing five genera were recorded. Acaulospora laevis was recorded in all seasons at both sites. Multivariate analysis revealed that season and host coaffected AM spore density and species richness with the former having greater influence than the latter.

scholarly journals Diversity, host-specificity and stability of sponge-associated fungal communities of co-occurring sponges

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4965 ◽  
Author(s):  
Mary T.H.D. Nguyen ◽  
Torsten Thomas
Keyword(s):  
Host Specificity ◽  
Horizontal Transmission ◽  
Critical Role ◽  
Fungal Species ◽  
Fungal Communities ◽  
Sponge Species ◽  
Fungal Community Composition ◽  
Potential Core ◽  
Community Profiling ◽  
Surrounding Seawater

Fungi play a critical role in a range of ecosystems; however, their interactions and functions in marine hosts, and particular sponges, is poorly understood. Here we assess the fungal community composition of three co-occurring sponges (Cymbastela concentrica, Scopalina sp., Tedania anhelans) and the surrounding seawater over two time points to help elucidate host-specificity, stability and potential core members, which may shed light into the ecological function of fungi in sponges. The results showed that ITS-amplicon-based community profiling likely provides a more realistic assessment of fungal diversity in sponges than cultivation-dependent approaches. The sponges studied here were found to contain phylogenetically diverse fungi (eight fungal classes were observed), including members of the family Togniniaceae and the genus Acrostalagmus, that have so far not been reported to be cultured from sponges. Fungal communities within any given sponge species were found to be highly variable compared to bacterial communities, and influenced in structure by the community of the surrounding seawater, especially considering temporal variation. Nevertheless, the sponge species studied here contained a few “variable/core” fungi that appeared in multiple biological replicates and were enriched in their relative abundance compared to seawater communities. These fungi were the same or highly similar to fungal species detected in sponges around the world, which suggests a prevalence of horizontal transmission where selectivity and enrichment of some fungi occur for those that can survive and/or exploit the sponge environment. Our current sparse knowledge about sponge-associated fungi thus indicate that fungal communities may perhaps not play as an important ecological role in the sponge holobiont compared to bacterial or archaeal symbionts.

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