Effects of Wildfire and Harvest Disturbances on Forest Soil Bacterial Communities

Smith, Nancy R.; Kishchuk, Barbara E.; Mohn, William W.

doi:10.1128/aem.01355-07

Cited by 141 publications

(104 citation statements)

References 55 publications

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“…The investigation of wildfire or prescribed burning on the soil ammonium-N and nitrate-N had demonstrated that both inorganic N increased immediately after the fire, but these improvements were dissipated in 1 year or more post-fire (Covington et al, 1991;Covington and Sackett, 1992;Smith et al, 2008). The CCA results showed a positive correlation between soil nitrate-N and dominant AOA genotypes (JF520847, JF520868 and JF520885) (Fig.…”

Section: Effects Of Long-term Prescribed Burning On Aob and Aoa Commumentioning

confidence: 94%

Shifts in the abundance and community structure of soil ammonia oxidizers in a wet sclerophyll forest under long-term prescribed burning

Long

Chen

et al. 2014

Science of The Total Environment

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• We examined how fires affected the abundances and communities of soil AOB and AOA.• A long-term repeated forest fire experiment was investigated.• Fires increased the abundance of bacterium amoA genes, but not archaeal amoA genes.• Fire also modified the composition of AOA and AOB communities.• AOB genotype was affected by soil pH and DOC, while AOA by nitrate-N and DOC. a b s t r a c t a r t i c l e i n f o Fire shapes global biome distribution and promotes the terrestrial biogeochemical cycles. Ammonia-oxidizing bacteria (AOB) and archaea (AOA) play a vital role in the biogeochemical cycling of nitrogen (N). However, behaviors of AOB and AOA under long-term prescribed burning remain unclear. This study was to examine how fire affected the abundances and communities of soil AOB and AOA. A long-term repeated forest fire experiment with three burning treatments (never burnt, B0; biennially burnt, B2; and quadrennially burnt, B4) was used in this study. The abundances and community structure of soil AOB and AOA were determined using quantitative PCR, restriction fragment length polymorphism and clone library. More frequent fires (B2) increased the abundance of bacterium amoA gene, but tended to decrease archaeal amoA genes. Fire also modified the composition of AOA and AOB communities. Canonical correspondence analysis showed soil pH and dissolved organic C (DOC) strongly affected AOB genotypes, while nitrate-N and DOC shaped the AOA distribution. The increased abundance of bacterium amoA gene by fires may imply an important role of AOB in nitrification in fire-affected soils. The fire-induced shift in the community composition of AOB and AOA demonstrates that fire can disturb nutrient cycles.

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Section: Effects Of Long-term Prescribed Burning On Aob and Aoa Commumentioning

confidence: 94%

Shifts in the abundance and community structure of soil ammonia oxidizers in a wet sclerophyll forest under long-term prescribed burning

Long

Chen

et al. 2014

Science of The Total Environment

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“…The optimum pH for methane oxidation has been reported to be 7.0-7.5 [67]. A rise in pH above the optimal level would result in a decline in methane oxidation.…”

Section: Ch 4 Fluxmentioning

confidence: 99%

The Emissions of Carbon Dioxide, Methane, and Nitrous Oxide during Winter without Cultivation in Local Saline-Alkali Rice and Maize Fields in Northeast China

et al. 2017

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Agricultural ecosystems are important contributors to atmospheric greenhouse gasses (GHGs); however, in situ winter emission data in saline-alkali fields are scarce. Gas samples were collected during different periods, from three rice (R1-R3) and three maize (M1-M3) fields with different soil pH levels and salinity conditions. Carbon dioxide (CO 2 ) emissions in the rice and maize fields decreased with decreasing temperature during the freezing period and increased with the rising temperature during the thawing period, with the majority of winter CO 2 emissions occurring during these two periods. Peaks in methane (CH 4 ) emissions were observed during the freezing period in the rice fields and during the snow-melting period in the rice and maize fields. CH 4 emissions in the rice fields and CH 4 uptake rates in the maize fields were significantly (P < 0.05) related to surface soil temperature. Nitrous oxide (N 2 O) emissions remained relatively low, except for during the peaks observed during the snow-melting period in both the rice and maize fields, leading to the high GHG contribution of the snow-melting period throughout the winter. Higher pH and salinity conditions consistently resulted in lower CO 2 , CH 4 , and N 2 O emissions, CH 4 uptake, and lower global warming potential (GWP). These results can contribute to the assessment of the GWP during winter in saline-alkali regions.

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“…Fires are ecologically important disturbances (Bond et al, 2005) and their effects on plant and animal communities as well as soil biogeochemistry have been widely studied (Certini, 2005;Wang and Kemball, 2005;Ferrenberg et al, 2006). Recent work has also shown that fire induces microbial community shifts characterized by an increase in the relative abundance of Firmicutes and/or b-proteobacteria and an increase in the ratio of bacteria to fungi (Yeager et al, 2005;Smith et al, 2008;Waldrop and Harden, 2008;Bárcenas-Moreno et al, 2011). However, the relative role of niche vs neutral assembly processes in driving these community shifts is unknown.…”

Section: Introductionmentioning

confidence: 99%

Changes in assembly processes in soil bacterial communities following a wildfire disturbance

et al. 2013

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Although recent work has shown that both deterministic and stochastic processes are important in structuring microbial communities, the factors that affect the relative contributions of niche and neutral processes are poorly understood. The macrobiological literature indicates that ecological disturbances can influence assembly processes. Thus, we sampled bacterial communities at 4 and 16 weeks following a wildfire and used null deviation analysis to examine the role that time since disturbance has in community assembly. Fire dramatically altered bacterial community structure and diversity as well as soil chemistry for both time-points. Community structure shifted between 4 and 16 weeks for both burned and unburned communities. Community assembly in burned sites 4 weeks after fire was significantly more stochastic than in unburned sites. After 16 weeks, however, burned communities were significantly less stochastic than unburned communities. Thus, we propose a three-phase model featuring shifts in the relative importance of niche and neutral processes as a function of time since disturbance. Because neutral processes are characterized by a decoupling between environmental parameters and community structure, we hypothesize that a better understanding of community assembly may be important in determining where and when detailed studies of community composition are valuable for predicting ecosystem function.

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Effects of Wildfire and Harvest Disturbances on Forest Soil Bacterial Communities

Cited by 141 publications

References 55 publications

Shifts in the abundance and community structure of soil ammonia oxidizers in a wet sclerophyll forest under long-term prescribed burning

Shifts in the abundance and community structure of soil ammonia oxidizers in a wet sclerophyll forest under long-term prescribed burning

The Emissions of Carbon Dioxide, Methane, and Nitrous Oxide during Winter without Cultivation in Local Saline-Alkali Rice and Maize Fields in Northeast China

Changes in assembly processes in soil bacterial communities following a wildfire disturbance

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