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Models are used increasingly to predict long-term changes in soil organic matter (SOM). Comparison with measured data is clearly desirable. We compared simulations of the mechanistic ITE (Edinburgh) Forest (EF) and Hurley Pasture (HP) ecosystem models with experimental SOM data from three long-term experiments: a 30 year old pine forest in South Carolina, USA, a 100 year old area of naturally regenerating...
In natural ecosystems, soil organic carbon (C) is derived almost exclusively from the residues of plants growing in situ. In agroecosystems, it has at least two origins: one is the remains from the previous native vegetation, and the other is the remains of the crop and the decomposition of its residues. Where vegetation has changed from plants with the C3 photosynthetic pathway to C4 pathway or vice...
Soil fauna consumes substantial amounts of litter and can even consume the entire annual litterfall in some ecosystems. The assimilation efficiency of fauna may reach 50% but is usually much smaller. Soil fauna may affect soil organic matter (SOM) dynamics not only by assimilating litter but also by modifying the soil environment at many spatiotemporal scales. Litter processing by fauna usually results...
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