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Meta-analysis of the effects of soil warming on soil respiration in forest ecosystems

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Sun J., Peng C., Onge B. S., Berninger F., McCaughey H., Lei X.
Polish Journal of Ecology
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2011
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tom 59
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nr 4
No consensus has emerged on the sensitivity of soil respiration to increasing temperatures under global warming due partly to the lack of data and unclear feedbacks. Our objective was to investigate the general trends of warming effects on soil respiration. This study used meta-analysis as a means to synthesize data from eight sites with a total of 140 measurements taken from published studies. The results presented here suggest that average soil respiration in forest ecosystems was increased approximately by 22.5% with escalating soil temperatures while soil moisture was decreased by 16.5%. The decline in soil moisture seemed to be offset by the positive effects of increasing temperatures on soil respiration. Therefore, global warming will tend to increase the release of carbon normally stored within forest soils into the atmosphere due to increased respiration.
2

Local warming about 1.3 degree Celsius in alpine meadow has no effect on root vole [Microtus oeconomus L.] population during winter

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Sun P., Zhao X., Klein J. A., Wei W.
Polish Journal of Ecology
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2005
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tom 53
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nr 1
The influence of air and soil warming on root vole (Microtus oeconomus L.) population was studied in winter period in top open chambers (OTC) (0.8–1.8 m²) warmed by conical fiberglass material and situated in alpine meadow (3250 m) at Qinghai-Tibet Plateau, China. The OTCs were distributed on an area of 30 × 30 m of experimental warming site; another site of the same area was a control one. The root vole population was investigated on two pairs of sites in “low-grazing” and “high-grazing” (by sheep) parts of the meadow; mark-recapture method was used. The winter-season averaged air and soil temperature inside of the chambers were 1.3°C higher than the temperature outside the chambers. The warming in the chambers had no statistically significant effect on root vole numbers, on average body mass of individual, and on average body mass of males and females. In conclusion, as small as 1.3°C warming of soil and air introduced locally and on small (several m²) scale, in the alpine meadow habitat in winter period, has possibly no effect on root vole numbers and biomass.
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