Regional Patterns of Decomposition and Primary Production Rates in the U.S. Great Plains

Regional Patterns of Decomposition and Primary Production Rates in the U.S. Great Plains

Warmer regions generally exhibit greater rates of soil respiration and organic matter decomposition than colder regions. In the Great Plains of the United States, soil organic matter declines from the northern part of the region to the south, suggesting greater decomposition rates in areas with warm...

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Veröffentlicht in:Ecology. - Duke University Press. - 83(2002), 2, Seite 320-327
1. Verfasser: Epstein, Howard E. (VerfasserIn)
Weitere Verfasser: Burke, Ingrid C., Lauenroth, William K.
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2002
Zugriff auf das übergeordnete Werk:Ecology
Schlagworte:Aboveground Net Primary Production Areal Patterns Carbon Dynamics Decomposition Grasslands Great Plains (USA) Precipitation Regional Scale Soil Organic Matter Soil Texture mehr... Temperature Biological sciences Physical sciences
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520 |a Warmer regions generally exhibit greater rates of soil respiration and organic matter decomposition than colder regions. In the Great Plains of the United States, soil organic matter declines from the northern part of the region to the south, suggesting greater decomposition rates in areas with warmer temperatures. Our study used a regional data set of aboveground net primary production, soil organic carbon, soil texture, and climate to evaluate the environmental controls over areal patterns in decomposition rates, (k; expressed as grams per year per gram of initial mass), throughout the U.S. Great Plains. We conducted multiple regression analyses of steady-state k with respect to mean annual temperature, mean annual precipitation, and percentage soil clay content to examine both the combined and individual effects of these independent variables on regional decomposition rates. Our results indicated that precipitation contributes more than either temperature or soil texture to areal patterns of decomposition rates in the U.S. Great Plains, explaining >30% of the areal variability in k. Decomposition rates increased with increasing precipitation and with decreasing soil clay content. Temperature explained <8% of the regional variability in k. Ancillary analyses that related temperature and aboveground net primary production in the region indicated that plant productivity declines with increasing temperatures. This suggests that the reduction in soil organic matter to the south in the U.S. Great Plains may be due to reduced plant inputs rather than to increases in decomposition rates. The response of decomposition to temperature is probably constrained by moisture in this water-limited region. Therefore, changes in decomposition rates resulting from temperature dynamics are likely to be minimal unless they are accompanied by sufficient changes in precipitation. 
540 |a Copyright 2002 Ecological Society of America 
650 4 |a Aboveground Net Primary Production 
650 4 |a Areal Patterns 
650 4 |a Carbon Dynamics 
650 4 |a Decomposition 
650 4 |a Grasslands 
650 4 |a Great Plains (USA) 
650 4 |a Precipitation 
650 4 |a Regional Scale 
650 4 |a Soil Organic Matter 
650 4 |a Soil Texture 
650 4 |a Temperature 
650 4 |a Biological sciences  |x Agriculture  |x Agricultural sciences  |x Agronomy  |x Soil science  |x Edaphology  |x Soil ecology 
650 4 |a Biological sciences  |x Agriculture  |x Agricultural sciences  |x Agronomy  |x Soil science  |x Pedology  |x Soil composition  |x Soil organic matter 
650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Geomorphology  |x Topography  |x Lowlands  |x Plains 
650 4 |a Physical sciences  |x Chemistry  |x Chemical reactions  |x Chemical processes  |x Chemical decomposition  |x Thermal decomposition 
650 4 |a Biological sciences  |x Agriculture  |x Agricultural sciences  |x Agrology  |x Soil physics  |x Soil temperature regimes 
650 4 |a Biological sciences  |x Agriculture  |x Agricultural sciences  |x Agronomy  |x Soil science  |x Soils  |x Organic soils 
650 4 |a Biological sciences  |x Agriculture  |x Agricultural sciences  |x Agronomy  |x Soil science  |x Edaphology  |x Soil ecology  |x Soil components  |x Soil organic carbon 
650 4 |a Biological sciences  |x Agriculture  |x Agricultural sciences  |x Agronomy  |x Soil science  |x Soils  |x Grassland soils 
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650 4 |a Biological sciences  |x Biology  |x Botany  |x Plant ecology  |x Forest ecology  |x Special Feature-Regional Ecological Analysis 
655 4 |a research-article 
700 1 |a Burke, Ingrid C.  |e verfasserin  |4 aut 
700 1 |a Lauenroth, William K.  |e verfasserin  |4 aut 
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952 |d 83  |j 2002  |e 2  |h 320-327