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Biodegradation of Phenol, 2,4‐DCP, 2,4‐D, and 2,4,5‐T in Field‐Collected Rhizosphere and Nonrhizosphere Soils
Author(s) -
Boyle Jay J.,
Shann Jodi R.
Publication year - 1995
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/jeq1995.00472425002400040033x
Subject(s) - rhizosphere , mineralization (soil science) , soil water , biodegradation , chemistry , environmental chemistry , bulk soil , botany , agronomy , biology , ecology , bacteria , organic chemistry , genetics
This study investigated xenobiotic biodegradation in rhizosphere soil collected from field‐grown plants, grouped for analysis as monocots or dicots. Microbial activity was highest in monocot rhizosphere soils, followed by dicot rhizosphere soils and, finally, nonrhizosphere soils. No differences were seen between these soils in the mineralization of phenol or 2,4‐dichloropbenol (2,4‐DCP), but there were differences in 2,4‐dichlorophenoxyacetic acid (2,4‐D) and 2,4,5‐trichlorophenoxyacetic acid (2,4,5‐T) mineralization. The rate constants for 2,4‐D or 2,4,5‐T mineralization in nonrhizosphere soil were lower than those for either rhizosphere soil. Monocot rhizosphere soil mineralized these compounds faster than dicot rhizosphere soil. Thus, soils that had a prior association with a plant showed significantly increased rates of mineralization for the more recalcitrant compounds tested. In addition, this enhanced mineralization in the rhizosphere appeared to be dependent on the type of plant involved.