Effects of nitrogen addition on soil microbes and their implications for soil C emission in the Gurbantunggut Desert, center of the Eurasian Continent

Huang, Gang; Cao, Yan; Wang, Bin; Li, Yan

doi:10.1016/j.scitotenv.2015.01.054

Cited by 28 publications

(22 citation statements)

References 56 publications

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“…On the contrary, Kou et al [26] found that F/B decreased with an increase in SND in acidic soils (pH = 3.78) in a subtropical pine plantation. However, our data showed that F/B increased with SND levels, indicating that bacterial development was limited by the SND levels and that fungi increased the destruction of high-resistance carbon complexes [27]. This may be related to the time of SND and the background pH of the soil, as prior reports have argued that long-term N deposition had a greater negative impact on fungal biomass than that of bacteria, resulting in a decline in F/B [29,45,55].…”

Section: Microbial Community Composition and Structuresupporting

confidence: 40%

“…A watershed laboratory profile showed that the fungal internal transcribed spacer (ITS) was the most abundant at low pH and that bacterial 16S was the most abundant at high pH [24]; however, on average, simulated nitrogen deposition (SND) significantly decreased the ratio of fungi-to-bacteria [26]. N deposition also changes the composition and structure of the microbial community, and some fungi in microbial communities may be replaced by bacteria with higher N utilization [27]. N addition was shown to have no significant effect on microbial community structure along a soil pH gradient [27]; this may be due to the different effects of N forms and to nitrification on soil pH and, thus, fungal and bacterial composition and functions [24,26].…”

Section: Introductionmentioning

confidence: 99%

“…N deposition also changes the composition and structure of the microbial community, and some fungi in microbial communities may be replaced by bacteria with higher N utilization [27]. N addition was shown to have no significant effect on microbial community structure along a soil pH gradient [27]; this may be due to the different effects of N forms and to nitrification on soil pH and, thus, fungal and bacterial composition and functions [24,26].…”

Section: Introductionmentioning

confidence: 99%

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Variations in the Compositions of Soil Bacterial and Fungal Communities Due to Microhabitat Effects Induced by Simulated Nitrogen Deposition of a Bamboo Forest in Wetland

Huang²,

Ekawati

et al. 2019

Forests

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Although numerous studies have been published on nitrogen (N) deposition, little is known about its impact on microbial communities in wetland forests. Here, we used simulated nitrogen deposition (SND) to analyze the importance of differences in soil microhabitats in promoting the diversity of soil bacteria and fungi. We compared various levels of SND (control (CK), low N (N30), medium N (N60), and high N (N90)) and found that these were associated with changes in soil microhabitats. Additionally, SND affected soil pH, clay and sand content of the soil, and specific surface area (SSA). Bacteria and fungi responded differently to increased SND levels. The alpha diversity of bacteria decreased with an increased SND level, while fungal abundance, diversity, and community evenness reached their maximum values at the N60 threshold. Principal coordinates analysis (PCoA), nonparametric multivariate analysis of variance (PERMANOVA), and linear discriminant analysis (LDA) coupled with effect size measurements (LefSe) also confirmed that the bacterial composition was different at N90 compared to other levels of SND while that of fungi was different at N60. A higher discriminant level (LDA score ≥4) may be a valuable index of selecting indicator microbial clades sensitive to SND for wetland management. Further, an increased pH was associated with a greater abundance of bacteria and fungi. In addition, the volume contents of clay and SSA were negatively correlated with bacteria but fungi are associated with soil specific gravity (SSG). Overall, in a neutral soil pH environment, pH fluctuation is the main influencing factor in terms of bacterial and fungal abundance and diversity. The diversity of fungi is more dependent on the type and relative content of solid phase components in soil than that of bacteria, implying the presence of species-specific niches for bacteria and fungi. These results demonstrate that changes in SND can induce short-term microbial and microhabitat changes.

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Section: Microbial Community Composition and Structuresupporting

confidence: 40%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variations in the Compositions of Soil Bacterial and Fungal Communities Due to Microhabitat Effects Induced by Simulated Nitrogen Deposition of a Bamboo Forest in Wetland

Huang²,

Ekawati

et al. 2019

Forests

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“…The study of CLPP was performed to evaluate the variations in functional diversity and physiological profiles among the microbial communities from CC treatments. Even though CLPP can only show the changes of cultivable microbes, it can be used for analyzing microbial community physiological activity and their relations with microbial variables (Huang et al, 2015). In our study, the substrate utilization results reflected by AUC showed that CC induced important functional changes in the microbial community.…”

Section: Microbial Respiration and Soil Enzyme Activitiesmentioning

confidence: 65%

Soil microbial functionality in response to the inclusion of cover crop mixtures in agricultural systems

Chavarría

Verdenelli

Muñoz

et al. 2016

Span. j. agric. res.

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Agricultural systems where monoculture prevails are characterized by fertility losses and reduced contribution to ecosystem services. Including cover crops (CC) as part of an agricultural system is a promising choice in sustainable intensification of those demanding systems. We evaluated soil microbial functionality in cash crops in response to the inclusion of CC by analyzing soil microbial functions at two different periods of the agricultural year (cash crop harvest and CC desiccation) during 2013 and 2014. Three plant species were used as CC: oat (Avena sativa L.), vetch (Vicia sativa L.) and radish (Raphanus sativus L.) which were sown in two different mixtures of species: oat and radish mix (CC1) and oat, radish and vetch mix (CC2), with soybean monoculture and soybean/corn being the cash crops. The study of community level physiological profiles showed statistical differences in respiration of specific C sources indicating an improvement of catabolic diversity in CC treatments. Soil enzyme activities were also increased with the inclusion of CC mixtures, with values of dehydrogenase activity and fluorescein diacetate hydrolysis up to 38.1% and 35.3% higher than those of the control treatment, respectively. This research evidenced that CC inclusion promotes soil biological quality through a contribution of soil organic carbon, improving the sustainability of agrosystems. The use of a CC mixture of three plant species including the legume vetch increased soil biological processes and catabolic diversity, with no adverse effects on cash crop grain yield.

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“…In general, heavy grazing has a negative effect on soil microbial community composition and biomass [53]. Soil microbial communities rely on plant tissues and root excreta as energy sources for multiplication [54], and microbial activities are negatively related to soil bulk density and pH value [8] but strongly correlated with SOC and TN [55,56]. Our results, however, showed that in the arid desert environment, the reduction of soil microbial biomass in FG is closely related to lower water content and organic matter content.…”

Section: Discussionmentioning

confidence: 99%

Effects of Livestock Exclusion on Soil Physical and Biochemical Properties of a Desert Rangeland

Qin¹,

Niu²,

Kang³

et al. 2015

Pol. J. Environ. Stud.

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Effects of nitrogen addition on soil microbes and their implications for soil C emission in the Gurbantunggut Desert, center of the Eurasian Continent

Cited by 28 publications

References 56 publications

Variations in the Compositions of Soil Bacterial and Fungal Communities Due to Microhabitat Effects Induced by Simulated Nitrogen Deposition of a Bamboo Forest in Wetland

Variations in the Compositions of Soil Bacterial and Fungal Communities Due to Microhabitat Effects Induced by Simulated Nitrogen Deposition of a Bamboo Forest in Wetland

Soil microbial functionality in response to the inclusion of cover crop mixtures in agricultural systems

Effects of Livestock Exclusion on Soil Physical and Biochemical Properties of a Desert Rangeland

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