Soil organic carbon

Indirect methods of estimating sorption have been used when actual measurement of sorption isotherm is impossible (44). For instance, sorption coefficients have been estimated from soil organic carbon and a specific surface of soil, and from semiempidcal equations using pesticide properties. 

Mishra, U., Ussiri, D. A. N., and Lai, R. (2010). Tillage effects on soil organic carbon storage and dynamics in Corn Belt of Ohio USA. Soil Tillage Res. 107, 88-96. 

West, T. O. and Post, W. M. (2002). Soil organic carbon sequestration rates by tillage and crop rotation. A global data analysis. Soil Sci. Soc. Am. J. 66,1930-1946. 

F. J. Stevenson, Cycles of Soil Organic Carbon, Nitrogen, Phosphorous, Sulphur, Micronutrients, J. Wiley Sons, New York, 1986,... 

Soil Air -- Soil Water -— Soil Organic Carbon... 

Air, 25% Water, 50% Soil Solids Soil Organic Carbon = 2%... 

Soil Organic Carbon Sediment Organic Carbon... 

Table IV uses DBCP to illustrate the effect of soil organic carbon concentration on leaching mobility. In the very low organic carbon soil, there is almost no adsorption for the compound and the leaching model breaks down because it predicts penetration depths greater than the water penetration. In these cases the prediction is adjusted to show compound and water penetration depths as the same.

Table IV. Effect of Soil Organic Carbon Levels on Leaching Depth (cm)...

The basic wood densities (dry) for different species were obtained from Ref. [36]. A basic density value obtained from the weighted average of the densities of each site s species was used for the species that for various reasons could not be identified. For estimation of SOC (soil organic carbon), equation (6) was used [30]. For data analysis, the nonparametric type test was chosen. We used the INFOSTAT software, and a value of 0.05 was considered significant. 

Hyun H., Chang A.C., Parker D.R., Page A.L. Cadmium solubility and phytoavailability in sludge-treated soils Effects of soil organic carbon. J Environ Qual 1998 27 329-334. 

Sparling GP (1992) Ratio of microbial biomass carbon to soil organic carbon as a sensitive indicator of changes in soil organic matter. Aust J Soil Res 30 195- 207... 

Tan Z, Lai R, Owens L, Izaurralde RC (2007) Distribution of light and heavy fractions of soil organic carbon as related to land use and tillage practice. Soil Till Res 92 53-59... 

Soil contributes to a greater extent to total carbon storage than do above-ground vegetation in most forests (Johnson and Curtis 2001). The total amount of soil organic carbon (SOC) in the upper meter of soil is about 1500 x 1015 g C (Eswaran et al. 1993 Batjes 1996), and the global atmospheric pool of CO2 is about 750 x 1015 g C (Harden et al. 1992). The CO2 emission from soil into atmosphere is about 68.0-76.5 1015 g C per year, and this is more than 10 times the CO2 released from fossil fuel combustion (Raich and Potter 1995). Variations in SOC pools and SOM turnover rates, therefore, exert substantial impacts on the carbon cycles of terrestrial ecosystems in terms of carbon sequestration in soil and CO2 emission from soil. 

Soil organic carbon concentration was determined by the sulfuric acid-potassium dichromate method (Kalembasa and Jenkinson 1973) at the Soil Chemistry Laboratory of South China Institute of Botany, CAS. Results... 

Balesdent J, Mariotti A, Boisgontier D (1990) Effect of tillage on soil organic carbon mineralization estimated from 13C abundance in maize fields. J Soil Sci 41 587-596... 

Boutton TW, Archer SR, Midwood AJ, Zitzer SF, Bol R (1998) 513C values of soil organic carbon and their use in documenting vegetation change in a subtropical savanna ecosystem. Geoderma 82 5-41... 

Soil organic carbon-water partitioning coefficient (K,c) 115-11500... 

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