Abstract
The amounts of neutral sugar and uronic acid released with 1 N H 2SO 4 and the total neutral sugar in soil have been measured for the top 10 cm of 38 Irish grassland soils. The three carbohydrate fractions were highly correlated with carbon, correlations being greatest within similar soil classes. Total sugar would account for 23.7%, neutral sugar released with 1 N H 2SO 4 for 11.2%, and uronic acid for 1.25% of the carbon in the “average” Irish soil (5.30% carbon). Hydrolysis of soil with 1 N H 2SO 4 released about three-quarters of the hemicellulose components. Whereas this fraction showed minor variations between soil classes when examined by gas-liquid and paper chromatography, total sugar and uronic acid fractions showed no observable variation. The presence in soil of xylan incorporating (1 → 4)-linked β — D-xylopyranose residues has been demonstrated.
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