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Lignin in Particle-Size Fractions of Native Grassland Soils as Influenced by Climate

^a Dep. of Soil Science and Soil Geography, Univ. of Bayreuth, 95440 Bayreuth, Germany
^b 4104 El Macero Dr., Davis, CA, 95616 USA

View larger version (38K): [in a new window]   Fig. 1 Average concentration (bars) of lignin-derived phenols (VSC), as well as phenolic acid to aldehyde ratios (curves) of the syringyl (ac/al)S and vanillyl (ac/al)V structural units in particle-size fractions of 18 topsoils in the native grasslands. The symbol *** indicates that VSC is significantly higher compared to the next finer fraction at the P < 0.001 probability level of significance. The symbol 1 indicates that significant difference is obtained only when ANOVA is conducted with natural log-transformed VSC values. The error bars result from variations in VSC concentrations of a respective fraction across the prairie

View larger version (19K): [in a new window]   Fig. 2 Ratio of lignin-derived phenolic acids to aldehydes of the vanillyl (ac/al)V and syringyl structural units (ac/al)S as related to mean annual temperature (MAT, °C) for the fine sand fractions (20–250 µm)

View larger version (24K): [in a new window]   Fig. 3 Ratio of lignin-derived phenolic acids to aldehydes as related to mean annual temperature (MAT, °C) for the syringyl (ac/al)S and vanillyl (ac/al)V structural units in the (a) silt and (b) clay fractions (Site XIII, an Aquoll, was eliminated from the calculation of r)