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ARS Home » Research » Publications at this Location » Publication #114269
Title: SOIL CO2 EVOLUTION: FIELD MOIST VS. DRIED AND REWETTED SOILS

Author
item HANEY, R - TEXAS A&M UNIVERSITY
item Franzluebbers, Alan
item HONS, A - TEXAS A&M UNIVERSITY
item ZUBERER, D - TEXAS A&M UNIVERSITY

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 11/1/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The objective of this study was to compare C and N mineralization from eight soils that were kept continuously moist vs. subsamples that were dried and rewetted. In addition, an experiment using the same soils as above examined C and N mineralization as affected by incubation temperature (25 vs. 35 C). Carbon mineralization was 14% greater in dried and rewetted than in continuously moist soils. Carbon mineralized from dried and rewetted and moist soils was highly related (r2=0.91). Nitrogen mineralization was 12% greater in soils that were dried and rewetted compared to continuously moist soils. Again, results from dried and rewetted soils were highly related to those of continuously moist soils (r2=0.98). These same soils were also incubated at 25 or 35 C. Carbon mineralization was 42% greater when incubated at 35 than 25 C, although results were highly related (r2=0.98). Nitrogen mineralization had results similar to C mineralization, with 31% more N mineralized at 35 vs. 25 C. Results from the two experiments were strongly correlated (r2=0.95). Incubation temperature appeared to have a greater effect on the flush of C and N from soils than did drying and rewetting.