Contrasting temperature responses of dissolved organic carbon and phenols leached from soils

Plant and Soil
Jonathan S WilliamsGeoffrey D Abbott

Abstract

Plant-derived phenols are a major input to the terrestrial carbon cycle that might be expected to contribute substantially to dissolved organic carbon (DOC) losses from soils. This study investigated changes in DOC and phenols in leachates from soil treated with individual plant litter types under seasonal temperature change. Senescing grass, buttercup, ash and oak litters were applied to soil lysimeters. Leachates were collected over 22 months and analysed for DOC and phenols. Phenols in litter and DOC were analysed using on-line thermally assisted hydrolysis and methylation with tetramethylammonium hydroxide (TMAH). Mass loss differed between litter type (buttercup>ash>grass>oak). Phenol concentrations in the senescing litters (<2 % TOC) were small, resulting in minor losses to water. Seasonal soil temperature positively correlated with DOC loss from litter-free soils. An initial correlation between temperature change and total phenol concentration in grass and ash litter treatment leachates diminished with time. Dissolved phenol variety in all litter-amended soil leachates increased with time. Plant-derived phenols from senescing litter made a minor contribution to DOC loss from soils. The strength of the relationship betwee...Continue Reading

References

Jan 27, 2005·Proceedings of the National Academy of Sciences of the United States of America·Stephan Hättenschwiler, Patrick Gasser
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