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- W2013242069 abstract "Abstract The influence of soil texture and clay mineral composition on the decomposition of uniformly-labelled ( 14 C) ryegrass ( Lolium hybridum Hausskn) has been investigated. Two clay and two silt loam soils amended with 14 C-labelled ryegrass were allowed to decompose in micro-lysimeters under field conditions for 5 years. Periodically the micro-lysimeters were destructively harvested and the total amount of 14 C remaining in the soil and the fraction of the 14 C incorporated into microbial biomass measured. The influence of the amount and surface area of clay was assessed by calculating the mean and variances of residence times of biomass- 14 C and residual- 14 C. Surface areas were estimated from the mineralogical composition of the soil, and also measured by adsorption of p -nitrophenol. After 5 years' of incubation, 12–25% of the labelled- 14 C was retained by the soils. Decomposition was initially very rapid, between one-third to one-half of the labelled 14 C being lost after 9 weeks. Thereafter, the rate of decomposition was much reduced. During the initial phase of decomposition (9 weeks), a greater portion of the 14 C was retained by the two clay soils than by silt loam soils. In amorphic and smectitic soils the residence times for 14 C were increased because of the protection of microbial metabolites by clay surfaces. The amount of 14 C remaining in the soil did not relate to the amount of clay but correlated with the surface area, as measured by p -nitrophenol adsorption. Apparently, the type of clay, expressed in terms of surface area, controlled carbon turnover rates and residence times. This parameter may provide a reasonable predictor of organic matter decomposition rates and stabilization in different soils." @default.
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- W2013242069 title "14C-labelled ryegrass turnover and residence times in soils varying in clay content and mineralogy" @default.
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- W2013242069 doi "https://doi.org/10.1016/s0038-0717(96)00250-7" @default.
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