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- Title
Carbon dioxide-enriched agroecosystems: influence of tillage on short-term soil carbon dioxide efflux
- Authors
Prior, S. A.; Reicosky, D.C.; Torbert, H. A.; Rogers, H. H.; Runion, G. B.
- Abstract
Increasing atmospheric carbon dioxide ( CO{sub}2{end}) concentrationcan increase biomass production that may influence carbon (C) dynamics in terrestrial ecosystems. Soil CO{sub}2{end} efflux as affected by crop residues from high CO{sub}2{end} environments managed under different tillage systems has not been explored. This study examined the effects of tillage systems in a legume {soybean [Glycine max (L.) Merr.]} and nonlegume {grain sorghum [Sorghum bicolor] (L.) Moench.} CO{sub}2{end}-enriched agroecosystem on the rates of short-term CO{sub}2{end} evolution from a Blanton loamy sand (loamy siliceous, thermicGrossarenic Paleudults). In the spring of 1994, CO{sub}2{end} effluxobservations initiated within 5 s after a tillage event were compared to no-tillage conditions for 8 d in plots where both crop species had been grown in open top field chambers under two CO{sub}2{end} conditions (ambient and twice ambient) for two seasons (1992 and 1993). Added CO{sub}2{end} increased yields, residue, and root biomass; higher percent ground cover was also observed in CO{sub}2{end}-enriched plots prior to the tillage treatment. Differences in C/N ratio of the residue may have influenced CO{sub}2{end} efflux rates; C/N ratio was highest for sorghum and was increased by elevated CO{sub}2{end}. Efflux patterns were characterized by flushes of CO{sub}2{end} following initial tillage and rainfall events. Species x tillage and CO{sub}2{end} x species interactions were noted on several days and for total CO{sub}2{end} efflux values. Our results suggest that short-term CO{sub}2{end} fluxes may be greater for tilled soybean and for soybean grown under elevated CO{sub}2{end}; however, short-term flux rates in the sorghum crop were affected by tillage, but not by CO{sub}2{end} level. These short-term results should be viewed with caution when predicting long-term C turnover in agroecosvstems.
- Subjects
AGRICULTURE; CARBON dioxide; SOIL science; SOILS
- Publication
Journal of Environmental Quality, 1997, Vol 26, Issue 1, p244
- ISSN
0047-2425
- Publication type
Article
- DOI
10.2134/jeq1997.00472425002600010034x