Interaction between rhizosphere microorganisms and plant roots: 13C fluxes in the rhizosphere after pulse labeling |
| |
| Authors: | I V Yevdokimov R Ruser F Buegger M Marx J C Munch |
| |
| Institution: | (1) Institute of Physicochemical and Biological Problems of Soil Science, Russian Academy of Sciences, ul. Institutskaya 2, Pushchino, Moscow oblast, 142290, Russia;(2) Institute of Soil Ecology, GSF Research Center for the Environment and Health, 85764 Neuherberg, Germany |
| |
| Abstract: | The input dynamics of labeled C into pools of soil organic matter and CO2 fluxes from soil were studied in a pot experiment with the pulse labeling of oats and corn under a 13CO2 atmosphere, and the contribution of the root and microbial respiration to the emission of CO2 from the soil was determined from the fluxes of labeled C in the microbial biomass and the evolved carbon dioxide. A considerable amount of 13C (up to 96% of the total amount of the label found in the rhizosphere soil) was incorporated into the biomass of the rhizosphere microorganisms. The diurnal fluctuations of the labeled C pools in the microbial biomass, dissolved organic carbon, and CO2 released in the rhizosphere of oats and corn were related to the day/night changes, i.e., to the on and off periods of the photosynthetic activity of the plants. The average contribution of the corn root respiration (70% of the total CO2 emission from the soil surface) was higher than that of the oats roots (44%), which was related to the lower incorporation of rhizodeposit carbon into the microbial biomass in the soil under the corn plants than in the soil under the oats plants. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
