Moisture effects on microbial activity and community structure in decomposing birch litter in the Alaskan taiga

Schimel, Joshua P.; Gulledge, Jay; Clein-Curley, Joy S.; Lindstrom, Jon E.; Braddock, Joan F.

doi:10.1016/s0038-0717(98)00182-5

Cited by 305 publications

(179 citation statements)

References 19 publications

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“…In contrast, Actinobacteria and Alphaproteobacteria displayed higher resistance. They were tolerant to the rapid changes in soil water potential, probably owing to thicker and more rigid cell walls, and they possess compatible solutes which enhance osmoregulatory capabilities (Schimel et al, 1999). Alternatively, these microorganisms are capable of rapid growth on the labile substrates released into the soil during the frequent DW events (Denef et al, 2001).…”

Section: Bacterial Communities Respond Sensitively To Dw Disturbancementioning

confidence: 99%

“…The relative abundance of Bacilli sharply increased at 1 c and became the dominant group in the bacterial communities, and these changes might lead to a flush of soil respiration (Barnard et al, 2015). Bacilli belongs to Gram-positive bacteria with thick cell walls, which might explain the strong resilience to the DW disturbance (Schimel et al, 1999). The two classes of Actinobacteria responded differently; neither Thermoleophilia nor Actinobacteria were resistant, but Actinobacteria were resilient.…”

Section: Bacterial Communities Respond Sensitively To Dw Disturbancementioning

confidence: 99%

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Copper pollution decreases the resistance of soil microbial community to subsequent dry–rewetting disturbance

Wang

et al. 2016

Journal of Environmental Sciences

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Dry-rewetting (DW) disturbance frequently occurs in soils due to rainfall and irrigation, and the frequency of DW cycles might exert significant influences on soil microbial communities and their mediated functions. However, how microorganisms respond to DW alternations in soils with a history of heavy metal pollution remains largely unknown.Here, soil laboratory microcosms were constructed to explore the impacts of ten DW cycles on the soil microbial communities in two contrasting soils (fluvo-aquic soil and red soil) under three copper concentrations (zero, medium and high). Results showed that the fluctuations of substrate induced respiration (SIR) decreased with repeated cycles of DW alternation. Furthermore, the resistance values of substrate induced respiration (RS-SIR) were highest in non-copper-stressed (zero) soils. Structural equation model (SEM) analysis ascertained that the shifts of bacterial communities determined the changes of RS-SIR in both soils. The rate of bacterial community variance was significantly lower in noncopper-stressed soil compared to the other two copper-stressed (medium and high) soils, which might lead to the higher RS-SIR in the fluvo-aquic soil. As for the red soil, the substantial increase of the dominant group WPS-2 after DW disturbance might result in the low RS-SIR in the high copper-stressed soil. Moreover, in both soils, the bacterial diversity was highest in non-copper-stressed soils. Our results revealed that initial copper stress could decrease the resistance of soil microbial community structure and function to subsequent DW disturbance.

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Section: Bacterial Communities Respond Sensitively To Dw Disturbancementioning

confidence: 99%

Section: Bacterial Communities Respond Sensitively To Dw Disturbancementioning

confidence: 99%

Copper pollution decreases the resistance of soil microbial community to subsequent dry–rewetting disturbance

Wang

et al. 2016

Journal of Environmental Sciences

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“…There is a negative relationship between litterfall and rainfall (Mosquera et al 2007), witch at least in some tropical forests can be attributed to the presence of deciduous plants (Fournier & Camacho de Castro 1973). However, rainfall is crucial for litter decay (Cornejo et al 1994, Castellanos-Barliza & León 2011 and correlates with microbial biomass (Schimel et al 1999) and abundance of other organisms (Bonilla et al 2008). Litter humidity affects the community living under, in and on the litter, because in many cases species migrate vertically in order to achieve optimal environmental conditions (Barrientos 2000, Naranjo-García 2003, Doblas 2007.…”

mentioning

confidence: 99%

“…Litter humidity affects the community living under, in and on the litter, because in many cases species migrate vertically in order to achieve optimal environmental conditions (Barrientos 2000, Naranjo-García 2003, Doblas 2007. Another important finding is that extreme drought and occasional rewetting cause water stress, which significantly reduces biomass and microbial biodiversity and causes changes in the structure of the decomposers community (Schimel et al 1999).…”

mentioning

confidence: 99%

Dynamics of leaf litter humidity, depth and quantity: two restoration strategies failed to mimic ground microhabitat conditions of a low montane and premontane forest in Costa Rica.

Barrientos

2012

RBT

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Abstract:Little is known about how restoration strategies affect aspects like leaf litter's quantity, depth and humidity. I analyzed leaf litter's quantity, depth and humidity yearly patterns in a primary tropical lower montane wet forest and two restored areas: a 15 year old secondary forest (unassisted restoration) and a 40 year old Cupressus lusitanica plantation (natural understory). The three habitats are located in the Río Macho Forest Reserve, Costa Rica. Twenty litter samples were taken every three months (April 2009-April 2010 in each habitat; humidity was measured in 439g samples (average), depth and quantity were measured in five points inside 50x50cm plots. None of the restoration strategies reproduced the primary forest leaf litter humidity, depth and quantity yearly patterns. Primary forest leaf litter humidity was higher and more stable ( =73.2), followed by secondary forest ( =63.3) and cypress plantation ( =52.9) (Kruskall-Wallis=77.93, n=232, p=0.00). In the primary (Kruskal-Wallis=31.63, n=78, p<0.001) and secondary (Kruskal-Wallis=11.79, n=75, p=0.008) forest litter accumulation was higher during April due to strong winds. In the primary forest (Kruskal-wallis=21.83, n=78, p<0.001) and the cypress plantation (Kruskal-wallis=39.99, n=80, p<0.001) leaf litter depth was shallow in October because heavy rains compacted it. Depth patterns were different from quantity patterns and described the leaf litter's structure in different ecosystems though the year. Rev. Biol. Trop. 60 (3):

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“…Water stress conditions lead to decrease soil microbe biomass (Schimel et al, 1999), certainly by the indirect decrease of the soil available O 2 needed by aerobic micro-organisms (Smolander et al, 2005). As a consequence, the mineralization process, converting soil organic matter into NH 4 + , as well as the nitrification process, converting NH 4 + into NO 3 -, which are both achieved by micro-organisms, are reduced (Fierer & Schimel, 2002;Vale et al, 2007).…”

Section: Soil N Transformation As Affected By Water Deficitmentioning

confidence: 99%

Plant N Fluxes and Modulation by Nitrogen, Heat and Water Stresses: A Review Based on Comparison of Legumes and Non Legume Plants

Salon¹,

Jean-Christophe²,

Larmure³

et al. 2011

Abiotic Stress in Plants - Mechanisms and Adaptations

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Moisture effects on microbial activity and community structure in decomposing birch litter in the Alaskan taiga

Cited by 305 publications

References 19 publications

Copper pollution decreases the resistance of soil microbial community to subsequent dry–rewetting disturbance

Copper pollution decreases the resistance of soil microbial community to subsequent dry–rewetting disturbance

Dynamics of leaf litter humidity, depth and quantity: two restoration strategies failed to mimic ground microhabitat conditions of a low montane and premontane forest in Costa Rica.

Plant N Fluxes and Modulation by Nitrogen, Heat and Water Stresses: A Review Based on Comparison of Legumes and Non Legume Plants

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