The yield values of densimetric fractions from typical chernozems of different land use types
Open Access
- 28 September 2020
- journal article
- Published by V.V. Dokuchaev Soil Science Institute in Dokuchaev Soil Bulletin
- No. 103,p. 85-107
- https://doi.org/10.19047/0136-1694-2020-103-85-107
Abstract
One of the most justified and applied approaches to isolating pools of soil organic matter is fractionation in heavy liquids. The main problem with this approach is rather large losses in the separation of fractions at the stage of washing fractions from heavy liquids. The paper presents a densimetric fractionation protocol that can significantly reduce these losses. It is suggested to use 0.001 M HCl for washing. This approach, in comparison with distilled water, allows reducing losses of weight from 15 to 5% and of carbon from 7.5 to 2.5%. The paper provides a detailed protocol, used by the Laboratory of Soil Biochemistry of V.V. Dokuchaev Soil Science Institute, to isolate four densimetric fractions using sodium polytungstate solutions: free and occluded SOM with a density of 2.0 g/cm3. In the work we used samples of typical chernozems of different land use types. It was shown that the processes of soil restoration and degradation significantly affect the content of light occluded soil organic matter.Keywords
This publication has 30 references indexed in Scilit:
- Water stability and labile humic substances of typical chernozems under different land usesEurasian Soil Science, 2012
- Nature of the “occluded” low-density fraction in soil organic matter studies: A critical reviewSoil Science and Plant Nutrition, 2009
- SOM fractionation methods: Relevance to functional pools and to stabilization mechanismsSoil Biology and Biochemistry, 2007
- Pedogenesis of Chernozems in Central Europe — A reviewGeoderma, 2007
- Effect of land use on the composition of soil organic matter in density and aggregate fractions as revealed by solid-state 13C NMR spectroscopyGeoderma, 2006
- Stabilization of organic matter in temperate soils: mechanisms and their relevance under different soil conditions – a reviewEuropean Journal of Soil Science, 2006
- Storage of organic carbon in aggregate and density fractions of silty soils under different types of land useGeoderma, 2005
- Soil Carbon Sequestration Impacts on Global Climate Change and Food SecurityScience, 2004
- Recycling of sodium polytungstate used in soil organic matter studiesSoil Biology and Biochemistry, 1999
- ULTRASONIC DISPERSION OF AGGREGATES: DISTRIBUTION OF ORGANIC MATTER IN SIZE FRACTIONSCanadian Journal of Soil Science, 1988