Fungal and bacterial N2O production regulated by soil amendments of simple and complex substrates

Chen, Huaihai; Mothapo, Nape V.; Shi, Wei

doi:10.1016/j.soilbio.2015.02.018

Cited by 46 publications

(30 citation statements)

References 53 publications

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“…Our findings support our first hypothesis and further proved that both nitrification and denitrification were largely driven by fungal communities in alpine meadow grasslands. A possible explanation is that fungi prefer the arid, high organic substrate and low-temperature environment (Pietikäi- nen Chen et al, 2015;Marusenko et al, 2013). In alpine grasslands, the mean annual temperature is 0 • C; even during the sampling day, the mean temperature was only 11 • C. The cold environment could cause higher activity in fungi than in bacteria.…”

Section: Discussionmentioning

confidence: 99%

“…Given the importance of winter grazing, winter grazing during the nongrowing seasons was further investigated (Zhu et al, 2015;Che et al, 2018). Alpine meadows in the region can be divided into two grazing seasons (i.e., warm-season grazing from June to September and cold-season grazing from October to May) (Cui et al, 2015). Before the experiment was conducted, we had examined how clipping simulated the effects of actual grazing before we established four replicated "actual grazing treatments" compared with the "simulated grazing treatments".…”

Section: Site and Samplingmentioning

confidence: 99%

“…Previous studies are mainly focused on bacterial nitrification and denitrification (Hayatsu et al, 2008;Klotz and Stein, 2008) because the conventional N cycle is thought to be controlled primarily by bacteria. However, recent studies using novel molecular techniques have shown that soil fungi are important players in terrestrial N cycling, including N 2 O production and nitrification-denitrification in drylands or soils with high organic carbon (C) and N (Chen et al, 2015;Huang et al, 2017;Laughlin and Stevens, 2002;Marusenko et al, 2013;Zhong et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Since optimum environments for fungi and bacteria are different, they may respond differently to environmental changes. Fungi prefer a lower temperature (Pietikäinen et al, 2005), higher organic C / N (Chen et al, 2015) and a more arid soil environment (Marusenko et al, 2013) compared to bacteria. Climate warming and grazing can change vegetation cover, soil water and energy balance, alter the quantity and quality of soil organic matter and mineral N content (Saggar et al, 2004), and thus affect N 2 O production (Shi et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Fungi regulate the response of the N<sub>2</sub>O production process to warming and grazing in a Tibetan grassland

Zhong

Wang

et al. 2018

Biogeosciences

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Abstract. Lack of understanding of the effects of warming and winter grazing on soil fungal contribution to the nitrous oxide (N2O) production process has limited our ability to predict N2O fluxes under changes in climate and land use management, because soil fungi play an important role in driving terrestrial N cycling. A controlled warming and winter grazing experiment that included control (C), winter grazing (G), warming (W) and warming with winter grazing (WG) was conducted to investigate the effects of warming and winter grazing on soil N2O production potential in an alpine meadow on the Tibetan Plateau. Our results showed that soil bacteria and fungi contributed 46 ± 2 % and 54 ± 2 % to nitrification, and 37 ± 3 % and 63 ± 3 % to denitrification in the control treatment, respectively. We conclude that soil fungi could be the main source of N2O production potential for the Tibetan alpine grasslands. In our results, neither warming nor winter grazing affected the activity of enzymes responsible for overall nitrification and denitrification. However, warming significantly increased the enzyme activity of bacterial nitrification and potential of N2O production from denitrification to 53 ± 2 % and 55 ± 3 %, respectively, but decreased them to 47 ± 2 % and 45 ± 3 %, respectively. Winter grazing had no such effects. Warming and winter grazing may not affect the soil N2O production potential, but climate warming can alter biotic pathways responsible for N2O production process. These findings confirm the importance of soil fungi in the soil N2O production process and how they respond to environmental and land use changes in alpine meadow ecosystems. Therefore, our results provide some new insights into ecological controls on the N2O production process and contribute to the development of an ecosystem nitrogen cycle model.

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Section: Discussionmentioning

confidence: 99%

Section: Site and Samplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fungi regulate the response of the N<sub>2</sub>O production process to warming and grazing in a Tibetan grassland

Zhong

Wang

et al. 2018

Biogeosciences

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“…Similar to the 9 computational procedure adopted in several past studies 22,29,30 the fungi to bacteria (F:B) ratio was calculated based on CO2 and N2O production in the control relative to gaseous production in soils treated with biocide. The ratio was calculated as:…”

Section: Computationsmentioning

confidence: 99%

Evaluation of antibacterial and antifungal compounds for selective inhibition of denitrification in soils

Ladan

Jacinthe

2016

Environ. Sci.: Processes Impacts

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Nitrous oxide (N2O) is an atmospheric constituent implicated in climate warming and stratospheric ozone depletion. Both bacteria and fungi participate in N2O production, but information is lacking with regard to the relative contribution of bacterial and fungal denitrifiers to the denitrification process in agricultural soils. The selective inhibition technique (SI) is widely used to assess the contribution of different groups of microbes to soil processes, but success of the technique depends on the effectiveness of the inhibitors.In this study, laboratory experiments were conducted to assess the contribution of bacteria and fungi to denitrification using soils from a woodlot, agricultural fields under conventional plowing (PT), and no-till for either 50 years (long-term) or 11 years (medium-term). A selective inhibition (SI) technique was developed using two bactericides (streptomycin, bronopol) and two fungicides (cycloheximide, captan) applied at different rates (0-32 mg g -1 soil). Regardless of application rate, streptomycin and cycloheximide were not effective inhibitors of denitrification, with degree of inhibition only between 2 and 20% relative to controls. These results are significant given the wide use of these products in SI studies. However, the bactericide bronopol and the fungicide captan effectively inhibited denitrification, with the strongest inhibition observed at an application rate of 16 mg g -1 soil. The ratio of fungal to bacterial denitrification activity (F:B) was generally less than 1, indicating a dominance of bacteria in denitrification activity in the soils investigated. However, an increase in F:B ratio from 0.24 in mediumterm NT to 0.87 in long-term NT soils was noted, suggesting perhaps a progressive increase in the role of fungal denitrifiers with longer duration of NT farming.3

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Fungal and Bacterial Respiration in Urban Technosols vs. Natural Soils

et al. 2019

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Fungal and bacterial N2O production regulated by soil amendments of simple and complex substrates

Cited by 46 publications

References 53 publications

Fungi regulate the response of the N<sub>2</sub>O production process to warming and grazing in a Tibetan grassland

Fungi regulate the response of the N<sub>2</sub>O production process to warming and grazing in a Tibetan grassland

Evaluation of antibacterial and antifungal compounds for selective inhibition of denitrification in soils

Fungal and Bacterial Respiration in Urban Technosols vs. Natural Soils

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Fungal and bacterial N2O production regulated by soil amendments of simple and complex substrates

Cited by 46 publications

References 53 publications

Fungi regulate the response of the N&lt;sub&gt;2&lt;/sub&gt;O production process to warming and grazing in a Tibetan grassland

Fungi regulate the response of the N&lt;sub&gt;2&lt;/sub&gt;O production process to warming and grazing in a Tibetan grassland

Evaluation of antibacterial and antifungal compounds for selective inhibition of denitrification in soils

Fungal and Bacterial Respiration in Urban Technosols vs. Natural Soils

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Fungi regulate the response of the N<sub>2</sub>O production process to warming and grazing in a Tibetan grassland

Fungi regulate the response of the N<sub>2</sub>O production process to warming and grazing in a Tibetan grassland