Response of Terrestrial CH sub(4) Uptake to Interactive Changes in Precipitation and Temperature Along a Climatic Gradient

We determined the response of terrestrial methane (CH sub(4)) uptake to 4years of full-factorial manipulations of precipitation and temperature in four ecosystems along a 50km warm and dry to cold and wet climatic gradient (desert grassland, pinyon-juniper woodland, ponderosa pine forest, and mixed...

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Veröffentlicht in:Ecosystems (New York) 2010-12, Vol.13 (8), p.1157-1170
Hauptverfasser: Blankinship, Joseph C, Brown, Jamie R, Dijkstra, Paul, Allwright, Michael C, Hungate, Bruce A
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container_title Ecosystems (New York)
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creator Blankinship, Joseph C
Brown, Jamie R
Dijkstra, Paul
Allwright, Michael C
Hungate, Bruce A
description We determined the response of terrestrial methane (CH sub(4)) uptake to 4years of full-factorial manipulations of precipitation and temperature in four ecosystems along a 50km warm and dry to cold and wet climatic gradient (desert grassland, pinyon-juniper woodland, ponderosa pine forest, and mixed conifer forest). Our goals were to determine whether ecosystem-specific, intraannual, and interactive responses to altered precipitation and warming are quantitatively important. Passive collectors and interceptors increased (+50% per event) and reduced (-30% per event) the quantity of precipitation delivered to experimental plant-soil mesocosms, and downward transfer along the elevation gradient warmed mesocosms by 1.8 degree C on average. Methane uptake in the colder and wetter ecosystems along the gradient decreased with increasing precipitation, especially during the wet season. The warmer and drier ecosystems, however, responded more strongly to warming, exhibiting less CH sub(4) uptake with increasing temperature. We found no interaction between altered precipitation and warming in any ecosystem. Soil CH sub(4) consumption in the laboratory was a strong predictor of ecosystem differences in field CH sub(4) consumption, but was a poor predictor of the effects of climatic change observed in the field. Based on our results, future climate scenarios that are wet and warm will cause the largest reduction in terrestrial CH sub(4) uptake across ecosystem types.
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Our goals were to determine whether ecosystem-specific, intraannual, and interactive responses to altered precipitation and warming are quantitatively important. Passive collectors and interceptors increased (+50% per event) and reduced (-30% per event) the quantity of precipitation delivered to experimental plant-soil mesocosms, and downward transfer along the elevation gradient warmed mesocosms by 1.8 degree C on average. Methane uptake in the colder and wetter ecosystems along the gradient decreased with increasing precipitation, especially during the wet season. The warmer and drier ecosystems, however, responded more strongly to warming, exhibiting less CH sub(4) uptake with increasing temperature. We found no interaction between altered precipitation and warming in any ecosystem. Soil CH sub(4) consumption in the laboratory was a strong predictor of ecosystem differences in field CH sub(4) consumption, but was a poor predictor of the effects of climatic change observed in the field. 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Soil CH sub(4) consumption in the laboratory was a strong predictor of ecosystem differences in field CH sub(4) consumption, but was a poor predictor of the effects of climatic change observed in the field. 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source Jstor Complete Legacy; Springer Nature - Complete Springer Journals
subjects Climate
Climatic changes
Conifers
Deserts
Ecosystems
Forests
Grasslands
Mesocosms
Methane
Pinus ponderosa
Precipitation
Rainfall
Soil
Temperature
Temperature effects
Terrestrial environments
title Response of Terrestrial CH sub(4) Uptake to Interactive Changes in Precipitation and Temperature Along a Climatic Gradient
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