title: Mitigating methane emission from paddy soil with rice-straw biochar amendment under projected climate change.
abstract: Elevated global temperatures and increased concentrations of carbon dioxide (CO2) in the atmosphere associated with climate change will exert profound effects on rice cropping systems, particularly on their greenhouse gas emitting potential. Incorporating biochar into paddy soil has been shown previously to reduce methane (CH4) emission from paddy rice under ambient temperature and CO2. We examined the ability of rice straw-derived biochar to reduce CH4 emission from paddy soil under elevated temperature and CO2 concentrations expected in the future. Adding biochar to paddy soil reduced CH4 emission under ambient conditions and significantly reduced emissions by 39.5% (ranging from 185.4 mg kg(-1) dry weight soil, dws season(-1) to 112.2 mg kg(-1) dws season(-1)) under simultaneously elevated temperature and CO2. Reduced CH4 release was mainly attributable to the decreased activity of methanogens along with the increased CH4 oxidation activity and pmoA gene abundance of methanotrophs. Our findings highlight the valuable services of biochar amendment for CH4 control from paddy soil in a future that will be shaped by climate change.
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, PR China.|Provincial Key Laboratory for Water Pollution Control and Environmental Safety Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Xingguo
authors.initials: X
authors.lastname: Han
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, PR China.|Provincial Key Laboratory for Water Pollution Control and Environmental Safety Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Xue
authors.initials: X
authors.lastname: Sun
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, PR China.|Provincial Key Laboratory for Water Pollution Control and Environmental Safety Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Wang
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, PR China.|Provincial Key Laboratory for Water Pollution Control and Environmental Safety Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Mengxiong
authors.initials: M
authors.lastname: Wu
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, PR China.|Provincial Key Laboratory for Water Pollution Control and Environmental Safety Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Da
authors.initials: D
authors.lastname: Dong
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, PR China.|Provincial Key Laboratory for Water Pollution Control and Environmental Safety Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Ting
authors.initials: T
authors.lastname: Zhong
authors.affiliation: Soil and Crop Sciences Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA.
authors.forename: Janice E
authors.initials: JE
authors.lastname: Thies
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, PR China.|Provincial Key Laboratory for Water Pollution Control and Environmental Safety Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Weixiang
authors.initials: W
authors.lastname: Wu