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Plant- and soil related controls of the flow of carbon from roots through the soil microbial biomass
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Plant- and soil related controls of the flow of carbon from roots through the soil microbial biomass
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Journal Article
Plant- and soil related controls of the flow of carbon from roots through the soil microbial biomass
1989
Overview
The flow of carbon from plant roots through the microbial biomass is one of the key processes in terrestrial ecosystems. Roots release considerable amounts of organic materials which are utilized by microbes as substrate for biosynthesis and energy supply. The fate of photosynthates and other organic material in the soil-root environment under different conditions was studied using ¹⁴C-tracers. Soil structure and texture had a large effect on the turnover of the ¹⁴C-labelled materials through the microbial biomass. Finer, clayey soils tended to be more 'preservative' than coarser, sandy soils, i.e. larger amounts of ¹⁴C were incorporated in microbial biomass and soil organic matter fractions in clayey soils than in sandy soils. The soil nutrient status also appeared to affect organic matter turnover. At limiting plant-nutrient concentrations the utilization of ¹⁴C-labelled photosynthates seem to be hampered. Plant roots influenced the transformation of glucose and crop residues and the effect was attributed to plant-induced changes in mineral nutrient status. The mechanisms of this process and the consequences are discussed. A number of areas for future research are identified, including the potentials for manipulating rhizodeposition.
Publisher
Kluwer Academic Publishers,Springer
Subject
/ Agrology
/ Agronomy. Soil science and plant productions
/ Biological and medical sciences
/ CARBON
/ CARBONE
/ CARBONO
/ Chemical, physicochemical, biochemical and biological properties
/ Fundamental and applied biological sciences. Psychology
/ Physics, chemistry, biochemistry and biology of agricultural and forest soils
/ Plants
