Soil Fungal Community Composition, Not Assembly Process, Was Altered by Nitrogen Addition and Precipitation Changes at an Alpine Steppe

Xiao, Yuanming; Li, Changbin; Yang, Yang; Peng, Yunfeng; Yang, Yuanhe; Zhou, Guoying

doi:10.3389/fmicb.2020.579072

Cited by 21 publications

(11 citation statements)

References 66 publications

(105 reference statements)

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“…The soil microbial community is an important biotic component of soil and an important driving force of many soil ecological processes ( Wang et al, 2021 ). Due to the high sensitivity of soil microbes, the increase in N deposition is bound to have a significant impact on the soil microbial community; however, the response to N deposition often differs in different ecosystems, and the relationship between the soil microbial community and soil factors is uncertain ( Xiao et al, 2020 ; He et al, 2021 ). Therefore, monitoring the response of soil microorganisms to N application is helpful to evaluate the changes of ecosystem processes driven by soil microbiota.…”

Section: Introductionmentioning

confidence: 99%

Soil Microbial Community Response to Nitrogen Application on a Swamp Meadow in the Arid Region of Central Asia

Chen

Yang

et al. 2022

Front. Microbiol.

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Although a large number of studies have reported the importance of microbial communities in terrestrial ecosystems and their response to nitrogen (N) application, it is not clear in arid alpine wetlands, and the mechanisms involved need to be clarified. Therefore, the response of the soil microbial community in a swamp meadow to short-term (1 year) N application (CK: 0, N1: 8, N2: 16 kg⋅N⋅hm–2⋅a–1) was studied using 16S/ITS rRNA gene high-throughput sequencing technology. Results showed that N application had no significant effect on soil microbial community diversity, but significantly changed soil bacterial community structure. N1 and N2 treatments significantly reduced the relative abundance of Chloroflexi (18.11 and 32.99% lower than CK, respectively). N2 treatment significantly reduced the relative abundance of Nitrospirae (24.94% lower than CK). Meanwhile, N application reduced the potential function of partial nitrogen (N) and sulfur (S) cycling in bacterial community. For example, compared with CK, nitrate respiration and nitrogen respiration decreased by 35.78–69.06%, and dark sulfide oxidation decreased by 76.36–94.29%. N application had little effect on fungal community structure and function. In general, short-term N application directly affected bacterial community structure and indirectly affected bacterial community structure and function through available potassium, while soil organic carbon was an important factor affecting fungal community structure and function.

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Section: Introductionmentioning

confidence: 99%

Soil Microbial Community Response to Nitrogen Application on a Swamp Meadow in the Arid Region of Central Asia

Chen

Yang

et al. 2022

Front. Microbiol.

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“…The mean annual precipitation is ~390 mm, most of which occurs from June to August. The vegetation is mainly dominated by grasses, such as Stipa purpurea Grisebach, Leymus secalinus (Georgi) Tzvel, and Poa crymophila Keng (Xiao et al, 2020). The growing season is from May to October and peaks in August.…”

Section: Methodsmentioning

confidence: 99%

“…Global change, particularly atmospheric N deposition and changing precipitation regimes, has considerable consequences for storage and patterns of N in alpine ecosystems (Fu and Shen, 2017; Lin et al, 2016). Given that alpine grasslands may possess the capacity for N 2 O release and are sensitive to global change (Xiao et al, 2020), understanding how alpine soil N 2 O emissions respond to N deposition and precipitation changes is crucial for predicting future atmospheric N 2 O concentrations.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen addition, rather than altered precipitation, stimulates nitrous oxide emissions in an alpine steppe

Yang

Xiao

et al. 2021

Ecology and Evolution

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Anthropogenic‐driven global change, including changes in atmospheric nitrogen (N) deposition and precipitation patterns, is dramatically altering N cycling in soil. How long‐term N deposition, precipitation changes, and their interaction influence nitrous oxide (N2O) emissions remains unknown, especially in the alpine steppes of the Qinghai–Tibetan Plateau (QTP). To fill this knowledge gap, a platform of N addition (10 g m−2 year−1) and altered precipitation (±50% precipitation) experiments was established in an alpine steppe of the QTP in 2013. Long‐term N addition significantly increased N2O emissions. However, neither long‐term alterations in precipitation nor the co‐occurrence of N addition and altered precipitation significantly affected N2O emissions. These unexpected findings indicate that N2O emissions are particularly susceptible to N deposition in the alpine steppes. Our results further indicated that both biotic and abiotic properties had significant effects on N2O emissions. N2O emissions occurred mainly due to nitrification, which was dominated by ammonia‐oxidizing bacteria, rather than ammonia‐oxidizing archaea. Furthermore, the alterations in belowground biomass and soil temperature induced by N addition modulated N2O emissions. Overall, this study provides pivotal insights to aid the prediction of future responses of N2O emissions to long‐term N deposition and precipitation changes in alpine ecosystems. The underlying microbial pathway and key predictors of N2O emissions identified in this study may also be used for future global‐scale model studies.

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“…The mean annual precipitation is˜390 mm, most of which occurs from June to August. The vegetation is mainly dominated by grasses, such as Stipa purpureaGrisebach, Leymus secalinus (Georgi) Tzvel, and Poa crymophila Keng (Xiao et al, 2020). The growing season is from May to October, and peaks in August.…”

Section: Site Description and Experimental Designmentioning

confidence: 99%

“…Global change, particularly atmospheric N deposition and changing precipitation regimes, has considerable consequences for storage and patterns of N in alpine ecosystems (Fu et al, 2017;Lin et al, 2016). Given that alpine grasslands may possess the capacity for N 2 O release and are sensitive to global change (Xiao et al, 2020), understanding how alpine soil N 2 O emissions respond to N deposition and precipitation changes is crucial for predicting future atmospheric N 2 O concentrations.…”

Section: Introductionmentioning

confidence: 99%

Altered precipitation regimes mitigate N2O flux response to nitrogen addition in an alpine steppe

Yang¹,

Xiao²,

et al. 2021

Preprint

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Anthropogenic-driven global change, including changes in atmospheric nitrogen (N) deposition and precipitation patterns, is dramatically altering N cycling in soil. How long-term N deposition, precipitation changes, and their interaction influence nitrous oxide (N2O) emissions remains unknown, especially in the alpine steppes of the Qinghai-Tibetan Plateau (QTP). To fill this knowledge gap, a platform of N addition and altered precipitation experiments was established in an alpine steppe of the QTP in 2013. N addition significantly increased N2O emissions, and alterations in soil NO3-N, pH, temperature, and belowground biomass modulated N2O emissions. In addition to abiotic parameters, ammonia-oxidizing bacteria dominated N2O emissions in nitrification compared with ammonia-oxidizing archaea. Changes in the denitrifying microbial community, namely a high ratio of (nirS+nirK) gene-containing to nosZ gene-containing organisms, were responsible for N2O emissions in denitrification. Altered precipitation did not affect N2O emissions. This unexpected finding, which is inconsistent with the conventional view that N2O emissions are controlled by soil water content, indicates that N2O emissions are particularly susceptible to N deposition in the alpine steppes. Notably, whereas N2O emissions were affected by N addition as a single factor, they were not significantly affected by the combination of precipitation changes and N addition, indicating that altered precipitation patterns may mitigate the positive feedback effect of N addition on N2O emissions. Consequently, our study suggests that the response of N2O emissions to N deposition in future global change scenarios will be affected by precipitation regimes in the alpine steppes.

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Soil Fungal Community Composition, Not Assembly Process, Was Altered by Nitrogen Addition and Precipitation Changes at an Alpine Steppe

Cited by 21 publications

References 66 publications

Soil Microbial Community Response to Nitrogen Application on a Swamp Meadow in the Arid Region of Central Asia

Soil Microbial Community Response to Nitrogen Application on a Swamp Meadow in the Arid Region of Central Asia

Nitrogen addition, rather than altered precipitation, stimulates nitrous oxide emissions in an alpine steppe

Altered precipitation regimes mitigate N2O flux response to nitrogen addition in an alpine steppe

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