Effect of Plant Water Stress on CO2 Concentrations in the Rhizosphere
Desislava Petkova, Shamaila Zia, Klaus Spohrer, Joachim Müller
University of Hohenheim, Inst. of Agricultural Engineering, Tropics and Subtropics Group, Germany
Soil respiration consists of autotrophic root respiration and heterotrophic microbial respiration in the rhizosphere. Together with the gas exchange of the bulk soil, they represent the main carbon efflux from the terrestrial ecosystems and - about 25% of the global carbon dioxide exchange at all. Soil temperature and soil water content are considered to be the two main factors, which can explain most of the alterations in carbon efflux. Many studies have been conducted as how soil temperature and soil moisture affect the soil respiration, but only few focused on the inter-linkages between CO2 concentration in the soil and plant water stress. The seasonal and temporal variations in soil CO2 concentration and its relationship with the plant water status remain uncertain.
Keywords: Plant water status, soil respiration, soil water content
Contact Address: Desislava Petkova, University of Hohenheim, Inst. of Agricultural Engineering, Tropics and Subtropics Group, 70593 Stuttgart, Germany, e-mail: dvyrbanovagmail.com