Soil aggregation dynamics and carbon sequestration
Journal Title: Journal of Applied and Natural Science - Year 2013, Vol 5, Issue 1
Abstract
The quantity and quality of residues determine the formation and stabilization of aggregate structure for soil organic carbon (SOC) sequestration. Plant roots and residues are the primary organic skeleton to enmesh the inorganic particles together and build macro- and microaggregates while sequestering SOC. There are three major organic binding agents of aggregation: temporary (plant roots, fungal hyphae, and bacterial cells), transient (polysaccharides), and persistent (humic compounds and polymers). Conversion of natural ecosystems into agricultural lands for intensive cultivation severely depletes SOC pools. Magnitude of SOC sequestration in the soil system depends on the residence time of SOC in aggregates. Microaggregates are bound to old organic C, whereas macroaggregates contain younger organic material. Many techniques have been used to assess the SOC distribution in aggregates. Classical methods include SOC determination in aggregate fractions by wet and dry sieving of bulk soil. Isotopic methods including the determination of 13C and 14C with mass spectrometry are techniques to quantify the turnover and storage of organic materials in soil aggregates. Other techniques involve the use of computed tomography, X-ray scattering, and X-ray microscopy to examine the internal porosity and inter-aggregate attributes of macro- and microaggregates. Current state-of-knowledge has not unravelled completely the underlying complex processes involved in the sequestration, stability, dynamics, and residence times of SOC in macro- and microaggregates. There is a need to develop a unique conceptual model of aggregate hierarchy
Authors and Affiliations
Rakesh Kumar, Kisan Rawat, Jitendra Singh Singh, Ashutosh Singh, Ashish Rai
Keywords
Related Articles
- EP ID EP120423
- DOI 10.31018/jans.v5i1.314
- Views 83
- Downloads 0
Studies on development and storage stability of dehydrated pumpkin based instant soup mix
The study was carried out to develop and standardize Instant Soup Mix (ISM) from dehydrated pumpkin powder and to evaluate nutritional (moisture, sugars, protein, β-carotene, fat, fibre and water activity) and sensory qu...
Evaluation of the effects of FYM and gypsum on onion (Allium cepa L.) production under sodic water irrigation
A field experiment was conducted at CCS Haryana Agricultural University, Hisar to study the effect of FYM and gypsum on onion (Allium cepa L.) production under sodic water irrigation. Treatments comprised of three levels...
Effect of DEM data resolution on low relief region sub-watershed boundaries delineating using of SWAT model and DEM derived from CARTOSAT-1 (IRS-P5), SRTM and ASTER
Watersheds are natural integrators of hydrological, biological, and geological processes and as such require an integrated approach to data analysis and modeling, which usually starts delineating accurately a polygon vec...
Evaluation of insecticides against blister beetle (Mylabris pustulata Thunb.) on pigeonpea, Cajanus cajan
Blister beetle, Mylabris pustulata (Family: Meloidae: Coleoptera) an important pest of pigeonpea, Cajanus cajan when fed on its different floral parts including petals, anthers, stigma and ovary. Stigma and ovary were da...
Status and conservation of avian fauna of Sultanpur National Park Gurgaon, Haryana (India)
The present study was conducted in Sultanpur National Park Gurgaon, Haryana (India) from February, 2011 to January, 2012 to analyze the avian diversity along with its status and abundance. During the study period, a tota...