Dynamics of litter carbon turnover and microbial abundance in a rye detritusphere

Poll, Christian; Marhan, Sven; Ingwersen, Joachim; Kandeler, Ellen

doi:10.1016/j.soilbio.2007.04.002

Cited by 152 publications

(83 citation statements)

References 27 publications

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“…Relative to soil bacteria, soil fungi have a strong competitive advantage in the utilization of straw. Previous observations support a dominance of fungi in the degradation of the polymerized fraction (e.g., cellulose and lignin) and a dominance of bacteria in the degradation of the soluble fraction (e.g., sugars and amino acids) Breland 1999, 2002;de Boer et al 2005;Poll et al 2008). …”

Section: Effect Of Straw Amendment On Microbial Communitiesmentioning

confidence: 74%

Effects of straw amendment and moisture on microbial communities in Chinese fluvo-aquic soil

et al. 2014

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Purpose Returning crop straw into fields is a typical agricultural practice to resolve an oversupply of straw and improve soil fertility. Soil microorganisms, especially eukaryotic microorganisms, play a critical role in straw decomposition. To date, microbial communities in response to straw amendment at different moisture levels in Chinese fluvo-aquic soil are poorly understood. The aim of this study was to explore the effects of straw amendment and moisture on microbial communities in Chinese fluvo-aquic soil. Materials and methods Two soils (one was applied with organic manure, and the other was not applied with any fertilizer) from a long-term field experiment in the North China Plain were collected. Soils with and without straw amendment at 25 and 55 % of the average water-holding capacities of the two soils were incubated at 25°C for 80 days. All treatments were sampled 20 and 80 days after the start of incubation. Microbial biomass and community structure were analyzed by phospholipid fatty acids (PLFA) assay, and the eukaryotic diversity and community composition were assessed via barcoded pyrosequencing of the 18S ribosomal RNA (rRNA) gene amplicons.Results and discussion PLFA analysis showed that straw amendment increased the biomass of Gram-positive bacteria, Gram-negative bacteria, actinobacteria, and fungi and shifted microbial community structure. The varied straw availability resulted in a large variation in microbial community structure. In the presence of straw, actinobacterial and fungal biomass both decreased under high moisture content. 18S rRNA gene pyrosequencing indicated that straw amendment decreased eukaryotic diversity and richness and probably restructured the eukaryotic community. Under identical moisture content, long-term organic manure-fertilized soil had higher eukaryotic diversity and richness than the unfertilized soil. In the amended soils under high moisture content, the relative abundance of dominant fungal taxa (Dikarya subkingdom, Ascomycota phylum, and Pezizomycotina subphylum) decreased. Conclusions Straw amendment increases microbial biomass, shifts microbial community structure, and decreases eukaryotic diversity and richness. High moisture content probably has a negative effect on fungal growth in the amended soils. In conclusion, microbial communities in Chinese fluvo-aquic soil are significantly affected by straw amendment at different moisture levels.

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Section: Effect Of Straw Amendment On Microbial Communitiesmentioning

confidence: 74%

Effects of straw amendment and moisture on microbial communities in Chinese fluvo-aquic soil

et al. 2014

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“…The response of the microbial populations to additional N supply may depend on the form of N and the current soil N status, moisture status, organic C content, and pH [20,32,33]. For example, the bacterial community structure shifts in a bark beetle (Scolytidae spp.)…”

Section: The Soil Fungal and Bacterial Population Size Responds To Inmentioning

confidence: 99%

“…Reference [25]). Feces have a physiochemically easy biodegradable structure and most of the N in the feces is soluble and labile, thereby giving an impulse to the microbial growth and decomposition processes in the organic layer [4,5,20,35]. This may account for the increased bacterial community size during main defoliation.…”

Section: The Soil Fungal and Bacterial Population Size Responds To Inmentioning

confidence: 99%

“…Overall, the effects of the organic input derived by phytophagous insects affecting fungal and bacterial gene abundance are poorly understood. However, bacteria are known to arrange a rapid turnover of easily decomposable compounds derived from litter, while fungi dominate a turnover of more complex organic compounds [20,21]. In acidic soils of pine forests, denitrification is expected to be an important driver for N turnover as nitrification rates in these "non-nitrifying" ecosystems are often negligibly low [6,22] and the nitrate reduction potential and nitrogen loss via denitrification are shown to be increased in these soils [23].…”

Section: Introductionmentioning

confidence: 99%

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The Abundance of Fungi, Bacteria and Denitrification Genes during Insect Outbreaks in Scots Pine Forests

Grüning

Beule

Meyer

et al. 2018

Forests

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Abstract:Outbreaks of defoliating insects may affect microbial populations in forests and thereby mass balances and ecosystem functioning. Here, we investigated the microbial dynamics in Scots pine (Pinus sylvestris L.) forests during outbreaks of the nun moth (Lymantria monacha L.) and the pine-tree lappet (Dendrolimus pini L.). We used real-time PCR (polymerase chain reaction) to quantify genes that characterize bacterial and fungal abundance and the denitrification processes (nirK, nirS, nosZ clades I and II) in different forest compartments and we analyzed the C and N content of pine needles, insect feces, larvae, vegetation layers, organic layers, and mineral soil horizons. The infestation of the nun moth increased the bacterial abundance on pine needles, in the vegetation layer, and in the upper organic layer, while fungal populations were increased in the vegetation layer and upper organic layer during both outbreaks. In soil, the abundance of nirK increased after insect defoliation, while the C/N ratios decreased. nosZ clades I and II showed variable responses in different soil layers and to different defoliating insects. Our results illustrate changes in the microbial populations in pine forests that were infested by defoliating insects and changes in the chemical soil properties that foster these populations, indicating a genetic potential for increased soil N 2 O emissions during the defoliation peak of insect outbreak events.

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“…The rates of microbially catalyzed processes, microbial biomass content, and also community composition varied considerably across a scale of several millimeters at the soil-litter interface (Poll et al, 2006(Poll et al, , 2008(Poll et al, , 2010Grundmann, 2004;Nicol et al, 2003). The spatial autocorrelation of b-glucosidase in soil and of cellobiohydrolase and N-acetylglucosaminidase in litter was measured at a resolution of 0.63 mm 2 and was established at 2 to 3 cm.…”

Section: Spatial Heterogeneity Of Enzyme Activity In Soil and Littermentioning

confidence: 99%

Distribution of Extracellular Enzymes in Soils: Spatial Heterogeneity and Determining Factors at Various Scales

Baldrián

2014

Soil Science Society of America Journal

133

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Dynamics of litter carbon turnover and microbial abundance in a rye detritusphere

Cited by 152 publications

References 27 publications

Effects of straw amendment and moisture on microbial communities in Chinese fluvo-aquic soil

Effects of straw amendment and moisture on microbial communities in Chinese fluvo-aquic soil

The Abundance of Fungi, Bacteria and Denitrification Genes during Insect Outbreaks in Scots Pine Forests

Distribution of Extracellular Enzymes in Soils: Spatial Heterogeneity and Determining Factors at Various Scales

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