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Kinetics of Rice Straw Decomposition in Soils
Author(s) -
Pal D.,
Broadbent F. E.
Publication year - 1975
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1975.00472425000400020027x
Subject(s) - straw , rice straw , soil water , decomposition , nitrogen , incubation , chemistry , carbon fibers , agronomy , soil carbon , zoology , soil science , environmental science , materials science , biology , inorganic chemistry , composite material , biochemistry , organic chemistry , composite number
Mature rice straw was decomposed in Sacramento clay and Stockton adobe clay at loading rates up to 8% of soil weight for 120 days. Carbon loss was linearly related to loading rate, and carbon loss at given loading rates was described by equations of the form C = kt m . Rice straw labeled with 13 C and 15 N added to the same two soils permitted distinction between straw and soil carbon and nitrogen during decomposition. A pronounced effect of straw on loss of soil carbon was observed, but the effects on soil nitrogen were small. Turnover times for the immature labeled straw were calculated to be between 0.8 and 3.4 years, depending on loading rate and soil. Priming ratios, defined as (soil C‐loss with straw) ÷ (soil C‐loss without straw) were greater than unity throughout the 120‐day period of incubation.