Soil Carbon Sequestration: A Remedy of Global Warming
Increase of CO2 had led harmful effects not only environment but also on human health. Best way to reduce it is to sequester it in natural reservoir such oceans and soils. Carbon sequestration means storage of carbon in geological formations such as soil, oceans, forests etc. Soil contains three times more carbon than vegetation and double as much as in atmosphere. In soil, it is in the form of soil organic carbon. The amount of soil organic carbon (SOC) differs from soil to soil depends upon several factors and land management practices such as tillage, climate, organic residues added to soil etc. It helps in plant growth by promoting nutrient cycling and also has a positive effect on root development. Models have been developed which help in measurement of soil organic carbon under different conditions. Molecular studies are also used to understand the carbon flow in plant- soil biota and also on interaction of microbes to rhizo depositions by plants. A study was conducted on effect of carbon sequestration in deep tillage, conventional tillage and zero-tillage in addition with and without organic residue (in individual tillage systems) at Punjab Agricultural University, Ludhiana, Punjab. SOC was higher in zero tillage with organic residue and lower in conventional tillage without residue in surface layers (0-15 cm). Similar results were observed in case of Basal Soil Respiration.
Keywords - Carbon Sequestration, Rhizodepositions, Soil Organic Carbon, Models for Soil Organic Carbon.