title: Effects of arbuscular mycorrhizal fungi on CH4emissions from rice paddies.
abstract: Arbuscular mycorrhizal fungi (AMF) play a key role in soil carbon storage and release; however, they have never been considered as a factor affecting methane (CH4) emissions from rice paddies. To reveal the role of AMF, the diurnal variations of CH4emissions from the noninoculated and inoculated rice field plots were compared at midseason drainage, reflooding stage, and end-of-season drainage. The results showed that the diurnal variation patterns in the two treatments both closely tracked soil water content at midseason drainage and end-of-season drainage, while correlated very well with the stomatal conductance of rice at reflooding stage. There were no significant differences between treatments in soil water content and stomatal conductance. However, the diurnal CH4emission fluxes at the three stages ranged from 4.8 to 39.3, 0.9 to 12.4, and 0.2 to 2.3 mg m-2h-1in the noninoculated plots, and those in the inoculated plots ranged from 2.1 to 18.7, 0.9 to 5.0, and 0.3 to 1.2 mg m-2h-1. The significant differences resulted from carbon-to-nitrogen ratios (C:N) of the noninoculated and inoculated soil, which had a negative linear correlation with maximum diurnal CH4fluxes. Compared with the noninoculated treatment, inoculating with AMF significantly increased soil C:N by improving the dry matter of rice, which intensified N limit for CH4production.
authors.affiliation: a State Key Lab of Urban Water Resource and Environment , School of Municipal and Environmental Engineering, Harbin Institute of Technology , Harbin , China.
authors.forename: Xue
authors.initials: X
authors.lastname: Zhang
authors.affiliation: a State Key Lab of Urban Water Resource and Environment , School of Municipal and Environmental Engineering, Harbin Institute of Technology , Harbin , China.
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.affiliation: a State Key Lab of Urban Water Resource and Environment , School of Municipal and Environmental Engineering, Harbin Institute of Technology , Harbin , China.|b HIT Yixing Academy of Environmental Protection , Yixing , China.
authors.forename: Fang
authors.initials: F
authors.lastname: Ma
authors.affiliation: a State Key Lab of Urban Water Resource and Environment , School of Municipal and Environmental Engineering, Harbin Institute of Technology , Harbin , China.
authors.forename: Jixian
authors.initials: J
authors.lastname: Yang
mesh_terms: D000383:Agriculture / Q000379:methods; D000393:Air Pollutants / Q000378:metabolism*; D002681:China; D004784:Environmental Monitoring; D000072480:Farms; D008697:Methane / Q000378:metabolism*; D038821:Mycorrhizae / Q000502:physiology*; D012275:Oryza / Q000378:metabolism* / Q000382:microbiology*; D012621:Seasons
chemical_list: D000393:Air Pollutants; D008697:Methane
keywords: C:N; CH4 emission flux; Rice; arbuscular mycorrhizal fungi; diurnal variation