A kinetic approach to evaluate salinity effects on carbon mineralization in a plant residue-amended soil.
- Author:
Farshid NOURBAKHSH
1
;
Ahmad R SHEIKH-HOSSEINI
Author Information
1. Department of Soil Science, School of Agriculture, Isfahan University of Technology, Isfahan 84154, Iran. farshid@cc.iut.ac.ir
- Publication Type:Journal Article
- MeSH:
Carbon;
chemistry;
Carbon Dioxide;
chemistry;
Cellulose;
metabolism;
Ecosystem;
Kinetics;
Medicago sativa;
metabolism;
Models, Chemical;
Plants;
metabolism;
Salts;
chemistry;
pharmacology;
Soil;
Soil Pollutants;
Triticum;
metabolism;
Zea mays;
metabolism
- From:
Journal of Zhejiang University. Science. B
2006;7(10):788-793
- CountryChina
- Language:English
-
Abstract:
The interaction of salinity stress and plant residue quality on C mineralization kinetics in soil is not well understood. A laboratory experiment was conducted to study the effects of salinity stress on C mineralization kinetics in a soil amended with alfalfa, wheat and corn residues. A factorial combination of two salinity levels (0.97 and 18.2 dS/m) and four levels of plant residues (control, alfalfa, wheat and corn) with three replications was performed. A first order kinetic model was used to describe the C mineralization and to calculate the potentially mineralizable C. The CO(2)-C evolved under non-saline condition, ranged from 814.6 to 4842.4 mg CO(2)-C/kg in control and alfalfa residue-amended soils, respectively. Salinization reduced the rates of CO(2) evolution by 18.7%, 6.2% and 5.2% in alfalfa, wheat and corn residue-amended soils, respectively. Potentially mineralizable C (C(0)) was reduced significantly in salinized alfalfa residue-treated soils whereas, no significant difference was observed for control treatments as well as wheat and corn residue-treated soils. We concluded that the response pattern of C mineralization to salinity stress depended on the plant residue quality and duration of incubation.
