Concurrent and rapid recovery of bacteria and protist communities in Canadian boreal forest ecosystems following wildfire

Dai, Zhongmin; Lv, Xiaofei; Ma, Bin; Chen, Na; Chang, Scott X.; Lin, Jiahui; Su, Weiqin; Liu, Huaiting; Huang, Yushan; Hu, Caixia; Luo, Yu; Dahlgren, Randy A.; Xu, Jianming

doi:10.1016/j.soilbio.2021.108452

Cited by 18 publications

(9 citation statements)

References 74 publications

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“…Microbial diversity and complexity of microbial co-occurrence in gullies were higher than in local farmland and similar to grass-covered deposition areas (Figures 1 and 5). That suggested that NVR could repair the microbial community from the impact of high soil erosion, just like NVR did in other terrestrial ecosystems, which were disturbed by environmental pollution, overgrazing, and excessive deforestation [7][8][9]28]. However, the fungal community composition at 0-20 cm, 20-40 cm, and 40-60 cm in gullies were all significantly different from the deposition area (Table S3).…”

Section: Soil Microbial Community In Gullies After Nvrmentioning

confidence: 93%

Microbial Community and Their Potential Functions after Natural Vegetation Restoration in Gullies of Farmland in Mollisols of Northeast China

Xiao

Zhang

Yan

et al. 2022

Land

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Although huge numbers of gullies have been widely formed and have severely decreased the quality of farmlands in mollisols, it is still unclear how the microbial community distributes after natural vegetation restoration (NVR), which highly relates to the ecological functions in the farmland. In this study, both the microbial community and their potential ecological functions after NVR were reviewed, together with the environmental factors relating to microbial evolution which were detected in two gullies of mollisols situated on farmland in Northeast China. The main results showed that NVR improved the microbial diversity and complexity of the co-occurrence network in gullies, and promoted bacterial community composition to be similar between the gully and deposition area. Moreover, the soil organic matter (SOM) regulated the microbial diversity by balancing soil available phosphorus (AP), soil moisture (SM), and pH, thus stimulating the key bacterial biomarkers of gullies (Rhizobiales, Microtrichales, TRA3-20) and regulating the bacterial composition, as well as indirectly enriching the function of bacteria to perform denitrification, C fixation, and phosphorus transport in gullies. In addition, abundant Dicotyledons in gullies mainly regulate the fungal community composition, and increased fungal richness in 0–20 cm soil depth, but decreased bacteria richness in 0–20 cm soil depth. Our findings revealed the repair mechanism of NVR on soil bacterial and fungal communities, especially on bacterial functionality, which should be given further attention in nutrient cycling across eroding mollisols in gullies.

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Section: Soil Microbial Community In Gullies After Nvrmentioning

confidence: 93%

Microbial Community and Their Potential Functions after Natural Vegetation Restoration in Gullies of Farmland in Mollisols of Northeast China

Xiao

Zhang

Yan

et al. 2022

Land

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“…At every growth stage, the samples originated from the rhizosphere and bulk soil. Co-occurring networks based on Pearson’s correlation analysis in this study were performed using the psych package in R studio [ 25 ]. The co-occurrence patterns of soil bacterial communities were studied based on strong correlations (correlation coefficient R > 0.6) and significant correlations ( p < 0.01).…”

Section: Methodsmentioning

confidence: 99%

“…In the natural environment, microbes usually live within complex ecological networks that interact with each other [ 24 , 25 ] and include positive interactions, such as competition and predation, and negative interactions, such as commensalism and mutualism. [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

“…Most analytical methods of soil microbial communities have been used to explain microbial diversity, composition, and the relationship between their changes and environmental factors [ 27 ], however, the relationships among the soil microbial species are still not clear. Recently, co-occurrence network analysis has been widely applied to characterize ecological linkages among microbes in complex ecosystems, including rivers [ 28 ], caves [ 29 ], soil [ 8 , 26 ], phyllosphere [ 25 , 30 ], the gut microbiome [ 31 ], and ocean ecosystems [ 32 ]. Co-occurrence network analysis can shed light on the mechanism of structure and assembly of complex microbial communities [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

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Soil Bacterial Community Shifts Are Driven by Soil Nutrient Availability along a Teak Plantation Chronosequence in Tropical Forests in China

Kunnan

Huang

et al. 2021

Biology

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Soil bacterial communities play crucial roles in ecosystem functions and biogeochemical cycles of fundamental elements and are sensitive to environmental changes. However, the response of soil bacterial communities to chronosequence in tropical ecosystems is still poorly understood. This study characterized the structures and co-occurrence patterns of soil bacterial communities in rhizosphere and bulk soils along a chronosequence of teak plantations and adjacent native grassland as control. Stand ages significantly shifted the structure of soil bacterial communities but had no significant impact on bacterial community diversity. Bacterial community diversity in bulk soils was significantly higher than that in rhizosphere soils. The number of nodes and edges in the bacterial co-occurrence network first increased and then decreased with the chronosequence. The number of strongly positive correlations per network was much higher than negative correlations. Available potassium, total potassium, and available phosphorus were significant factors influencing the structure of the bacterial community in bulk soils. In contrast, urease, total potassium, pH, and total phosphorus were significant factors affecting the structure of the bacterial community in the rhizosphere soils. These results indicate that available nutrients in the soil are the main drivers regulating soil bacterial community variation along a teak plantation chronosequence.

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“…The results of the significance test showed that rainfall and daytime duration had significant effects on the regeneration of forest communities (p = 0.002); for shrub communities, only rainfall was significant (p = 0.005). Wildfire, as a significant environmental factor in forest ecosystems, is a key driver of the evolution of vegetation communities [78,79]. To quantify the relationship between the severity of the burn and vegetation community regeneration, we extracted five fire areas with different burn severities based on the dNBR index according to the dNBR threshold classification proposed by the European Forest Fire Information Service (EFFIS), including unburned/very low, low, moderate, high, and very high.…”

Section: Multiclass Factor Analysis Of the Climate Factorsmentioning

confidence: 99%

Evaluating Effects of Post-Fire Climate and Burn Severity on the Early-Term Regeneration of Forest and Shrub Communities in the San Gabriel Mountains of California from Sentinel-2(MSI) Images

Liu

Chen

et al. 2022

Forests

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Studying the early changes in post-fire vegetation communities may improve the overall resilience of forests. The necessity for doing so was demonstrated by the Bobcat Fire, which seriously threatened the central San Gabriel Mountains and the Angeles National Forest in California. This study aimed to monitor and quantify the effects of climatological and topographic conditions along with burn severity on early (within 1 year) post-fire forests and shrubs community regeneration. In this study, we used Sentinel-2(MSI) intensive time-series imagery (July 2020–October 2021) to make a confusion matrix combined with 389 vegetation sample points on Google Earth Pro. The overall accuracy (OA) and the Kappa coefficient, calculated from the confusion matrix, were used as evaluation parameters to validate the classification results. With multiple linear regression models and Environmental Systems Research Institute (ESRI) historical images, we analyzed the effects of climate and slope aspects on the regeneration of post-fire forest and shrub communities. We also quantitatively analyzed the regeneration rates based on five burn severity types. The results show that the normalized burning rate (NBR) was the most accurate vegetation classification indicator in this study (OA: 92.3–99.5%, Kappa: 0.88–0.98). The vegetation classification accuracy based on SVM is about 6.6% higher than K-Means. The overall accuracy of the burn area is 94.87%. Post-fire climate factors had a significant impact on the regeneration of the two vegetation communities (R2: 0.42–0.88); the optimal regeneration slope was 15–35°; and the fire severity changed the original competition relationship and regeneration rate. The results provide four main insights into the regeneration of post-fire vegetation communities: (1) climate factors in the first regenerating season have important impacts on the regeneration of forest and shrub communities; (2) daytime duration and rainfall are the most significant factors for forests and shrubs regeneration; (3) tolerable low burn severity promotes forests regeneration; and (4) forests have a certain ability to resist fires, while shrubs can better tolerate high-intensity fire ecology. This study could support the implementation of strategies for regionalized forest management and the targeted enhancement of post-fire vegetation community resilience.

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Concurrent and rapid recovery of bacteria and protist communities in Canadian boreal forest ecosystems following wildfire

Cited by 18 publications

References 74 publications

Microbial Community and Their Potential Functions after Natural Vegetation Restoration in Gullies of Farmland in Mollisols of Northeast China

Microbial Community and Their Potential Functions after Natural Vegetation Restoration in Gullies of Farmland in Mollisols of Northeast China

Soil Bacterial Community Shifts Are Driven by Soil Nutrient Availability along a Teak Plantation Chronosequence in Tropical Forests in China

Evaluating Effects of Post-Fire Climate and Burn Severity on the Early-Term Regeneration of Forest and Shrub Communities in the San Gabriel Mountains of California from Sentinel-2(MSI) Images

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