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Climate Change 2016
October 27-29, 2016
Volume 7, Issue 9(Suppl) J Earth Sci Clim Change
ISSN: 2157-7617 JESCC, an open access journal
conferenceseries .com
October 24-26, 2016 Valencia, Spain
World Conference onClimate Change
Differentiated CO2 efflux in the mycorrhizosphere of rice cultivated in paddy soil
Lili Wei1, Shen Yu1 , Jing Din1,2, Miroslav Vosátka3, Bangping Cai4, Chengrong Chen5, Wenfei Yan6, Changyi Lu1,2 and Jinghua Xu 1,2
1Chinese Academy of Science, China
2University of Chinese Academy of Sciences, China
3Institute of Botany ASCR, Czech Republic
4Xiamen Botanical Garden, China
5Griffith University, Australia
6Xiamen University, China
Arbuscular mycorrhizal fungi (AMF) are the most widespread obligate biotrophic plant symbionts and their extra-radical
hyphae have the potential in the regulation of carbon (C) cycling by enhancing soil aggregation or by stimulating
priming effect. When exposed to the elevated CO2, hyphae growth and colonization rate were increased, and consequently
lead to more profound effects on C cycling. However, previous studies on AMF functions in the decomposition of organic C
have focused on hyphosphere (i.e. at presence of hyphae), very limited information is available for myco rhizosphere (i.e. at
presence of roots and hyphae). This study was set to test the differences in organic matter decomposition (indicated by CO2
efflux) between myco rhizosphere and hyphosphere. Two microcosm experiments were carried out using rhizobox method
to separate soil environment into root- and hyphae-compartment. AMF inoculation induced an increase of CO2 efflux from
the root-compartment, while there was no change in the hyphae-compartment. Stable C isotope analyses combing with the
soil microbial abundance analysis is indicated that the increased production of CO2 in root-compartment was related to the
increase of the exudates (i.e. the easy decomposed organic C input) from roots which stimulated by AMF. The crucial role
of AMF presence in C cycling was confirmed with differential CO2 efflux associated with mycorhizosphere vs. hyphosphere
environment.
Biography
Lili Wei is a Professor at Institute of Urban Environment, Chinese Academy of Sciences, China. Her research interests are Wetland Ecology, Plant Functional
Ecology, and Stable Isotope Ecology. She has more than 20 publications in different international journals.
Lili Wei et al., J Earth Sci Clim Change 2016, 7:9(Suppl)