Different and unified responses of soil bacterial and fungal community composition and predicted functional potential to 3 years’ drought stress in a semiarid alpine grassland

Wan, Qian; Li, Lei; Liu, Bo; Zhang, Zhihao; Xie, Mingyu

doi:10.3389/fmicb.2023.1104944

Cited by 12 publications

(3 citation statements)

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“…Third, the worsening of drought stress may lead to soil cracking, land degradation, and changes in the physical environment of the soil (air, water, aggregate structure, etc.) (Fitzpatrick et al, 2017;Wan et al, 2023), making it unsuitable for the propagation and growth of microorganisms. Additionally, studies have indicated that soil microorganisms reduce the loss of nutrients and metabolism under long-term drought stress (Manzoni et al, 2014;Brown et al, 2021), thereby reducing microbial biomass and enzyme production capacity.…”

Section: Effect Of Drought Intensity and Duration On Soil Microbial B...mentioning

confidence: 99%

Impact of drought on soil microbial biomass and extracellular enzyme activity

Qu,

Wang,

Gan

et al. 2023

Front. Plant Sci.

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IntroductionWith the continuous changes in climate patterns due to global warming, drought has become an important limiting factor in the development of terrestrial ecosystems. However, a comprehensive understanding of the impact of drought on soil microbial activity at a global scale is lacking.MethodsIn this study, we aimed to examine the effects of drought on soil microbial biomass (carbon [MBC], nitrogen [MBN], and phosphorus [MBP]) and enzyme activity (β-1, 4-glucosidase [BG]; β-D-cellobiosidase [CBH]; β-1, 4-N-acetylglucosaminidase [NAG]; L-leucine aminopeptidase [LAP]; and acid phosphatase [AP]). Additionally, we conducted a meta-analysis to determine the degree to which these effects are regulated by vegetation type, drought intensity, drought duration, and mean annual temperature (MAT).Result and discussionOur results showed that drought significantly decreased the MBC, MBN, and MBP and the activity levels of BG and AP by 22.7%, 21.2%, 21.6%, 26.8%, and 16.1%, respectively. In terms of vegetation type, drought mainly affected the MBC and MBN in croplands and grasslands. Furthermore, the response ratio of BG, CBH, NAG, and LAP were negatively correlated with drought intensity, whereas MBN and MBP and the activity levels of BG and CBH were negatively correlated with drought duration. Additionally, the response ratio of BG and NAG were negatively correlated with MAT. In conclusion, drought significantly reduced soil microbial biomass and enzyme activity on a global scale. Our results highlight the strong impact of drought on soil microbial biomass and carbon- and phosphorus-acquiring enzyme activity.

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Section: Effect Of Drought Intensity and Duration On Soil Microbial B...mentioning

confidence: 99%

Impact of drought on soil microbial biomass and extracellular enzyme activity

Qu,

Wang,

Gan

et al. 2023

Front. Plant Sci.

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“…Drought significantly alters the composition and structure of fungal communities [25]. Drought affects fungal communities by altering the effective use of soil water.…”

Section: Discussionmentioning

confidence: 99%

Changing trends of soil fungal communities in the western foot of the Greater Khingan Mountains under drought stress

Wei,

Fang,

et al. 2024

Second International Conference on Electrical, Electronics, and Information Engineering (EEIE 2023)

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Variation of soil moisture affect the structure and diversity of fungal communities. Therefore, in-depth research on soil fungal community under drought stress has important theoretical and practical significance for the western foothills of the Great Xing'an Mountains. We controlled the moisture content of the soils retrieved from the western foothills of the Greater Khingan at 20%, 15%, 10%, 5% and 0%, respectively, simulating drought stress scenario. A total of 3091 OTU sequences with 97% similarity were found by clustering, scattered in 8 phyla, 30 classes, 101 orders, 196 families and 308 genera, mainly in the phylum Ascomycetes, Basidiomycetes, Chytridiomycetes and Glomeromycota, with the highest relative abundance of 70.07% in Ascomycetes.W20 had five biomarkers, W15 had one, W10 had eight, W5 had three, and W0 had four. Drought stress reduced the abundance of Ascomycota, Zygomycota, Basidiomycota, and Glomeromycota substantially. Among them, Ascomycota showed a large increasing trend as drought stress increased, which may be attributed to Ascomycota's high species variety and evolutionary pace, which is more adapted for arid environments. The quantity of Fusarium, Chaetomium, monograhella, Trichoderma, Cercophora, Alternaria, Talaromyces, Conocybe, Amanita, and tomentella was considerably impacted by drought stress. Fusarium's relative abundance increased, then decreased, and then increased as drought stress increased, indicating that it has a strong adaptability to drought. It can cause plant root rot and other diseases, but Fusarium can also secrete cellulase, which plays a role in decomposing soil carbon, and participate in the dissolution of soil insoluble phosphorus with Penicillium, so as to improve phosphorus absorption and utilization by plants.

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“…However, our study showed that the FNC varies with correspondingly different droughts. This finding suggests that under moderate drought (D30%), some less drought‐tolerant fungi died, resulting in an increase in FNC; under severe drought (D50%), fungi with greater drought tolerance or even xerophilic fungi increased their dominance in the fungal community, and their lower mortality led to a significant reduction in FNC (Oliveira et al., 2020; Wan et al., 2023). Fungal necromass increased slightly at D30% treatment and decreased significantly at D50% treatment (Figure 2).…”

Section: Discussionmentioning

confidence: 99%

Fungal necromass is reduced by intensive drought in subsoil but not in topsoil

Liu,

Zou,

Chen

et al. 2023

Global Change Biology

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The frequency and intensity of droughts worldwide are challenging the conservation of soil organic carbon (SOC) pool. Microbial necromass is a key component of SOC, but how it responds to drought at specific soil depths remains largely unknown. Here, we conducted a 3‐year field experiment in a forest plantation to investigate the impacts of drought intensities under three treatments (ambient control [CK], moderate drought [30% throughfall removal], and intensive drought [50% throughfall removal]) on soil microbial necromass pools (i.e., bacterial necromass carbon, fungal necromass carbon, and total microbial necromass carbon). We showed that the effects of drought on microbial necromass depended on microbial groups, soil depth, and drought intensity. While moderate drought increased total (+9.1% ± 3.3%) and fungal (+13.5% ± 4.9%) necromass carbon in the topsoil layer (0–15 cm), intensive drought reduced total (−31.6% ± 3.7%) and fungal (−43.6% ± 4.0%) necromass in the subsoil layer (15–30 cm). In contrast, both drought treatments significantly increased the BNC in the topsoil and subsoil. Our results suggested that the effects of drought on the microbial necromass of the subsoil were more pronounced than those of the topsoil. This study highlights the complex responses of microbial necromass to drought events depending on microbial community structure, drought intensity and soil depth with global implications when forecasting carbon cycling under climate change.

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Different and unified responses of soil bacterial and fungal community composition and predicted functional potential to 3 years’ drought stress in a semiarid alpine grassland

Cited by 12 publications

References 75 publications

Impact of drought on soil microbial biomass and extracellular enzyme activity

Impact of drought on soil microbial biomass and extracellular enzyme activity

Changing trends of soil fungal communities in the western foot of the Greater Khingan Mountains under drought stress

Fungal necromass is reduced by intensive drought in subsoil but not in topsoil

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