Open AccessSoil microbial carbon uptake characteristics in relation to soil management
Author(s) -
Anderson TrauteHeide,
Gray T.R.G.
Publication year - 1990
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.1990.tb04047.x
Subject(s) - monoculture , biomass (ecology) , agronomy , environmental chemistry , microbial population biology , chemistry , soil carbon , environmental science , carbon fibers , total organic carbon , zoology , soil water , soil science , biology , bacteria , mathematics , algorithm , composite number , genetics
Abstract The kinetics of glucose uptake by soil microbial communities in 16 different soild (7 under monocultures and 9 under crop rotations) differing in microbial biomass content, % C org , pH and clay content were investigated at 22°C. The V max value of microbial bimasses under monoculture, was o.27 μg C gluc ? μg −1 C mic ? h −1 (range 0.18–0.44), twice as high as the mean value of V max of microbial biomasses under rotations (0.13 μg C gluc , range 0.07–0.19). Mean values of K m were 714 μg C gluc and 290 μg C gluc ? g −1 soil, respectively. These differences were highly significant ( P =0.001, based on SE) and could not be relate to particle size distribution of the soils, pH or C org . A Michaelis‐Menten type uptake response was apparent over the total range of glucose concentrations used (45.4–1453.3 μg C gluc ? g −1 soil) for microbial biomasses under rotation while the majority of microbial biomasses under monocultures showed a similar response only at low glucose concentrations. A different uptake mechanism appeared to be involved at higher glucose concentrations (similar to diffusion) in monoculture soils.