Activity of nematodes and enchytraeids, bacterial community composition, and functional redundancy in coniferous forest soil

Salminen, Jani; Hernesmaa, Anne; Karjalainen, Heli; Fritze, Hannu; Romantschuk, Martin

doi:10.1007/s00374-009-0409-4

Cited by 10 publications

(8 citation statements)

References 38 publications

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“…This would support the idea of functional redundancy of the SOM decomposing microbial community (e.g. Nannipieri et al 2003, Setälä and McLean 2004, Salminen et al 2010. Also Waldrop and Firestone (2006a) found that microbial community composition differed between plant overstory communities, but that these microbial communities were functionally similar.…”

Section: Climatic Gradient-and Translocation Studies (Studies III Andsupporting

confidence: 58%

“…However, the high amount of different microbial species in soil, the large variety of different enzymes microbes can excrete, and the non-specificity of a large part of these enzymes, leads to functional redundancy of the SOC decomposing microbial community as a whole (e.g. Nannipieri et al 2003, Setälä and McLean 2004, Salminen et al 2010. From this, it follows that microbes have a great potential for adapting to changing conditions, but also that it is not likely that small changes in microbial community composition change its function as a whole (Nannipieri et al 2003).…”

Section: Sources Of Carbon and Carbon Use Efficiencymentioning

confidence: 99%

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Temperature sensitivity of soil organic matter decomposition in boreal soils

Karhu¹

2010

Diss. For.

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The temperature sensitivity of decomposition of different soil organic matter (SOM) fractions was studied with laboratory incubations using 13 C and 14 C isotopes to differentiate between SOM of different age. The quality of SOM and the functionality and composition of microbial communities in soils formed under different climatic conditions were also studied. Transferring of organic layers from a colder to a warmer climate was used to assess how changing climate, litter input and soil biology will affect soil respiration and its temperature sensitivity. Together, these studies gave a consistent picture on how warming climate will affect the decomposition of different SOM fractions in Finnish forest soils: the most labile C was least temperature sensitive, indicating that it is utilized irrespective of temperature. The decomposition of intermediate C, with mean residence times from some years to decades, was found to be highly temperature sensitive. Even older, centennially cycling C was again less temperature sensitive, indicating that different stabilizing mechanisms were limiting its decomposition even at higher temperatures. Because the highly temperature sensitive, decadally cycling C, forms a major part of SOM stock in the organic layers of the studied forest soils, these results mean that these soils could lose more carbon during the coming years and decades than estimated earlier. SOM decomposition in boreal forest soils is likely to increase more in response to climate warming, compared to temperate or tropical soils, also because the Q 10 is temperature dependent. In the northern soils the warming will occur at a lower temperature range, where Q 10 is higher, and a similar increase in temperature causes a higher relative increase in respiration rates. The Q 10 at low temperatures was found to be inversely related to SOM quality. At higher temperatures respiration was increasingly limited by low substrate availability.

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Section: Climatic Gradient-and Translocation Studies (Studies III Andsupporting

confidence: 58%

Section: Sources Of Carbon and Carbon Use Efficiencymentioning

confidence: 99%

Temperature sensitivity of soil organic matter decomposition in boreal soils

Karhu¹

2010

Diss. For.

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“…Therefore the decomposition of SOM follows the common reaction kinetics (Arrhenius, 1889) irrespective of the microbial community structure. Functional redundancy is a common characteristic of the soil organisms (Bradford et al 2002; Setälä & MacLean, 2004; Salminen et al 2010) and soil microbes have a great potential for adapting their growth traits depending on the quality of the available substrate (Blagodatskaya et al 2009). Our results indicate that soil microbial communities are adapted to different carbon sources but that the temperature sensitivity of the carbon mineralization rate is not affected by the differences of the microbial communities.…”

Section: Discussionmentioning

confidence: 99%

Transplantation of organic surface horizons of boreal soils into warmer regions alters microbiology but not the temperature sensitivity of decomposition

Vanhala

Karhu

Tuomi

et al. 2010

Global Change Biology

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Pekka Vanhala, Kristiina Karhu, Mikko Tuomi, Katarina Bjorklof, Hannu Fritze, Hasse Hyvarinen, & Jari Liski, 'Transplantation of organic surface horizons of boreal soils into warmer regions alters microbiology but not the temperature sensitiviy of decomposition', Global Change Biology, Vol. 17 (1): 538-550, first published 16 December 2009. The version of record is available online at doi: 10.1111/j.1365-2486.2009.02154.x ?? 2010 Blackwell Publishing LtdChanges in soil carbon, the largest terrestrial carbon pool, are critical for the global carbon cycle, atmospheric CO2 levels and climate. Climate warming is predicted to be most pronounced in the northern regions and therefore the large soil carbon pool residing in boreal forests will be subject to larger global warming impact than soil carbon pools in the temperate or the tropical forest. A major uncertainty in current estimates of the terrestrial carbon balance is related to decomposition of soil organic matter (SOM). We hypothesized that when soils are exposed to warmer climate the structure of the ground vegetation will change much more rapidly than the dominant tree species. This change will alter the quality and amount of litter input to the soil and induce changes in microbial communities, thus possibly altering the temperature sensitivity of SOM decomposition. We transferred organic surface soil sections from the northern borders of the boreal forest zone to corresponding forest sites in the southern borders of the boreal forest zone and studied the effects of warmer climate after an adaptation period of 2 years. The results showed that initially ground vegetation and soil microbial community structure and community functions were different in northern and southern forest sites and that 2 years of exposure to warmer climate was long enough to cause changes in these ecological indicators. The rate of SOM decomposition was approximately equally sensitive to temperature irrespective of changes in vegetation or microbial communities in the studied forest sites. However, as temperature sensitivity of the decomposition increases with decreasing temperature regime, the proportional increase in the decomposition rate in northern latitudes could lead to significant carbon losses from the soils. ?? 2010 Blackwell Publishing Ltd

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“…Survey responses from the same hierarchical level (same city/ country/ climate zone) are likely to be more correlated than from different hierarchical levels (different cities/countries/climate zones). For this reason, we adopted multilevel linear models (MLM) [70,71], a hierarchical linear regression model with a dependent variable defined at the lowest (usually the individual) level, and explanatory variables at all existing levels [67]. Multilevel linear models have been adopted extensively in social and medical research studies where data are often collected from different geographical and/or organizational contexts.…”

Section: Statistical Analysis 231 Multilevel Linear Models (Mlm)mentioning

confidence: 99%

Impacts of demographic, contextual and interaction effects on thermal sensation—Evidence from a global database

Zhang

Dear

2019

Building and Environment

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Previous studies have demonstrated that non-thermal factors may affect occupants' thermal response in the indoor environment. The effects of demographic and contextual factors on thermal perception have been extensively studied, yet in previous studies, confounding variables have not been commonly controlled; it is also not known how these factors interact with each other. The current study leverages on the largest global thermal comfort database to date and explores the impacts of available demographic and contextual factors, including gender, ventilation mode, building typology, season and climate, on occupants' thermal sensation, along with their two-way and three-way interaction effects. Results indicate that all tested demographic and contextual factors except ventilation mode significantly affect occupants' thermal sensation. Under the same indoor environmental and outdoor climatic conditions, males perceive the environment as being significantly warmer than females in all contexts; males' thermal sensitivity is also consistently lower than females'. Thermal sensations in multifamily housing are significantly lower and closer to neutral than in office buildings under the same exposure conditions, yet it is likely to be the combined effects of building typology and ventilation mode. All else being equal, occupants in office buildings have less seasonal variation in thermal sensation than classrooms and multifamily housing. Residents in a warmer climate deem the same indoor thermal environment significantly cooler than residents in a cooler climate; this climatic adaptation is more pronounced in females than in males. Occupants' sensitivity to indoor air temperature, humidity and air movement significantly vary between different ventilation modes under different seasons.

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Activity of nematodes and enchytraeids, bacterial community composition, and functional redundancy in coniferous forest soil

Cited by 10 publications

References 38 publications

Temperature sensitivity of soil organic matter decomposition in boreal soils

Temperature sensitivity of soil organic matter decomposition in boreal soils

Transplantation of organic surface horizons of boreal soils into warmer regions alters microbiology but not the temperature sensitivity of decomposition

Impacts of demographic, contextual and interaction effects on thermal sensation—Evidence from a global database

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