INFLUENCE OF SOIL TEMPERATURE AND WATER TENSION ON THE DECOMPOSITION RATE OF CARBON-14 LABELED HERBAGE

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Abstract
Soil samples amended with ground herbage [14C labeled blue grama (Bouteloua gracilis)] were incubated at various temperatures (3, 10, 25, 40, 50 and 60.degree. C and water contents (.009, .03, .06, .60, 5.8 and 113 atm water tension). The O2 concentrations in the decomposition vessels were determined to evaluate the possibility that O2 became limiting in the experiments. 14C losses were assessed and the results used to develop a multiple regression equation which predicted percent C loss per hour as an exponential function of water tension, time, temperature and the inverse of temperature.

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