Agron. Sustain. Dev.
Volume 26, Number 1, January-March 2006
|Page(s)||9 - 19|
|Published online||24 January 2006|
Re-thinking the conservation of carbon, water and soil: a different perspectiveThomas Francis Shaxson
Greensbridge, Winterborne Kingston, Dorset DT11 9BJ, England
(Accepted 21 January 2005; published online 24 January 2006)
Abstract - Sustaining soil productivity requires continuing actions of soil organisms on organic materials for optimizing of soil porosity and of movements of roots, water and gases in the root-zone. Soil is more quickly formed and self-renewed from the top downwards than only by slow additions from the bottom upwards. Loss of porosity diminishes soil's infiltration capacity and water-holding potential. Factors that provide insufficient organic substrates for soil organisms and that unduly accelerate oxidation of soil organic matter hinder the self-recuperation of soil and facilitate 'Stage-1' loss of carbon from within soil aggregates. They predispose the soil to lose rapidly even more carbon, in particulate form, through 'Stage-2' losses during consequent processes of runoff and erosion. Forms of land use and management are advocated that favor the functioning of soil-inhabiting organisms, including plants, such that carbon's capture in photosynthesis is increased, its usefulness in the soil as a rooting medium is prolonged, and its subsequent immobilization in the process of sequestration ameliorates the rate of increase in carbon dioxide concentration in the global atmosphere.
Key words: carbon sequestration / soil-organisms / porosity / self-recuperation / sustainability
Corresponding author: Thomas Francis Shaxson FShaxson@aol.com
© INRA, EDP Sciences 2006