By Petra Marschner, Zdenko Rengel
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Additional resources for Nutrient cycling in terrestrial ecosystems
Springer, Berlin Muneer M, Oades JM (1989a) The role of Ca-organic interactions in soil aggregate stability. I. Laboratory studies with 14C-glucose, CaCO3 and CaSO4·2H2O. Aust J Soil Res 27:389–399 Neff JC, Asner GP (2001) Dissolved organic carbon in terrestrial ecosystems: synthesis and a model. Ecosystems 4:29–48 Nelson PN, Baldock JA, Oades JM (1993) Concentration and composition of dissolved organic carbon in streams in relation to catchment soil properties. Biogeochemistry 19:27–50 O’Connell A (1990) Microbial decomposition (respiration) of litter in eucalypt forests of southwestern Australia: an empirical model based on laboratory incubations.
1, 'SOC represents the net change in the amount of SOC over a specified time in response to the addition of an amount of organic carbon, CA, and the concomitant losses due to leaching of dissolved organic carbon (DOC) out of the soil profile, CL, lateral movement due to erosion, CE, and mineralisation, CM. Unless external sources of carbon are applied, carbon inputs are controlled by net primary productivity (NPP) originating from photosynthesis in the soil/ plant ecosystem. NPP represents the difference between total C uptake by plant photosynthesis and C loss via plant respiration.
Ecosystem properties considered most important to defining the biological capacity of soil decomposer communities include temperature and availability of oxygen and water. Various studies have reported negative correlations between SOC content and temperature and positive correlations between SOC and precipitation (Burke et al. 1989; Parton et al. 1987). As a result, this discussion of rate modifiers and duration of exposure will be limited to the effects of temperature and availability of oxygen and water.