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Flush of Carbon Dioxide Following Rewetting of Dried Soil Relates to Active Organic Pools
Author(s) -
Franzluebbers A. J.,
Haney R. L.,
Honeycutt C. W.,
Schomberg H. H.,
Hons F. M.
Publication year - 2000
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj2000.642613x
Subject(s) - mineralization (soil science) , soil water , environmental science , organic matter , soil organic matter , soil carbon , carbon dioxide , soil quality , environmental chemistry , soil test , biomass (ecology) , soil science , chemistry , agronomy , ecology , biology
Soil quality assessment could become more standardized with the development of a simple, rapid, and reliable method for quantifying potential soil biological activity. We evaluated the flush of CO 2 following rewetting of dried soil under standard laboratory conditions as a method to estimate an active organic matter fraction. The flush of CO 2 following rewetting of dried soil (3 d incubation at ≈50% water‐filled pore space and 25°C) was assessed for 20 soil series containing a wide range of organic C (20 ± 13 g kg −1 ) from Alberta–British Columbia, Maine, Texas, and Georgia. This flush of CO 2 explained 97% of the variability in cumulative C mineralization during24 d [ y = 12 + 3.3 ( x ) ; n = 471 ], 86% of the variability in soil microbial biomassC [ y = 337 + 2.4 ( x ) ; n = 399 ], and 67% of the variability in net N mineralization during24 d [ y = 18 + 0.10 ( x ) − 0.00002 ( x )2 ; n = 327 ]Accounting for geographical differences in mean annual temperature and precipitation, which could affect soil organic matter quality, further improved relationships between the flush of CO 2 and active, passive, and total C and N pools. Measuring the flush of CO 2 following rewetting of dried soil may have value for routine soil testing of biological soil quality because it (i) is an incubation procedure patterned after natural occurrences in most soils, (ii) exhibits strong overall relationships with active organic pools, (iii) shows relatively minor changes in relationships with active organic pools that may be due to climatic variables, (iv) has a simple setup with minimal equipment requirements, and (v) has rapid analysis time.