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Mitigating methane emission from paddy soil with rice-straw biochar amendment under projected climate change.

Han X, Sun X, Wang C, Wu M, Dong D, Zhong T, Thies JE, Wu W - Sci Rep (2016)

Bottom Line: 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.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.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.

View Article: PubMed Central - PubMed

Affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, PR China.

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.

No MeSH data available.


Related in: MedlinePlus

Total biomass, above-ground biomass (stems, leaves and grains) and root biomass of rice plants across all treatments.The values presented in the columns are mean ± standard deviations (n = 4). Different lowercase letters indicate significant differences between the eight treatments (p < 0.05). Rice plants were grown under ambient (CK, BC) or elevated temperature (tCK, tBC), or elevated CO2 (cCK, cBC), or simultaneously elevated temperature and CO2 (tcCK, tcBC). Paddy soil was either unamended (CK) or amended with biochar (BC) (2.5% w/w).
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f1: Total biomass, above-ground biomass (stems, leaves and grains) and root biomass of rice plants across all treatments.The values presented in the columns are mean ± standard deviations (n = 4). Different lowercase letters indicate significant differences between the eight treatments (p < 0.05). Rice plants were grown under ambient (CK, BC) or elevated temperature (tCK, tBC), or elevated CO2 (cCK, cBC), or simultaneously elevated temperature and CO2 (tcCK, tcBC). Paddy soil was either unamended (CK) or amended with biochar (BC) (2.5% w/w).

Mentions: Paddy soil was either amended with biochar (BC treatments) or left unamended (CK treatments) and then planted with rice. Rice plants were grown under ambient (CK, BC) or elevated temperature (+3 °C, tCK, tBC), or elevated CO2 (700 ppm, cCK, cBC), or simultaneously elevated temperature and CO2 (+3 °C and 700 ppm, tcCK, tcBC). Elevated temperature alone (tCK) significantly (p < 0.05) reduced total and above-ground rice biomass respectively compared to the control (CK) (Fig. 1). Elevated CO2 alone (cCK) significantly (p < 0.05) promoted the total, above-ground and root biomass of rice plants grown than the corresponding control (CK). Biochar amendment under ambient (BC) and elevated CO2 (cBC) conditions increased the total and above-ground biomass of rice plants significantly (p < 0.05) compared to their corresponding controls (CK and cCK). Moreover, biochar addition in the simultaneously elevated temperature and CO2 system significantly (p < 0.05) increased the total and above-ground biomass of rice plants, respectively.


Mitigating methane emission from paddy soil with rice-straw biochar amendment under projected climate change.

Han X, Sun X, Wang C, Wu M, Dong D, Zhong T, Thies JE, Wu W - Sci Rep (2016)

Total biomass, above-ground biomass (stems, leaves and grains) and root biomass of rice plants across all treatments.The values presented in the columns are mean ± standard deviations (n = 4). Different lowercase letters indicate significant differences between the eight treatments (p < 0.05). Rice plants were grown under ambient (CK, BC) or elevated temperature (tCK, tBC), or elevated CO2 (cCK, cBC), or simultaneously elevated temperature and CO2 (tcCK, tcBC). Paddy soil was either unamended (CK) or amended with biochar (BC) (2.5% w/w).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835783&req=5

f1: Total biomass, above-ground biomass (stems, leaves and grains) and root biomass of rice plants across all treatments.The values presented in the columns are mean ± standard deviations (n = 4). Different lowercase letters indicate significant differences between the eight treatments (p < 0.05). Rice plants were grown under ambient (CK, BC) or elevated temperature (tCK, tBC), or elevated CO2 (cCK, cBC), or simultaneously elevated temperature and CO2 (tcCK, tcBC). Paddy soil was either unamended (CK) or amended with biochar (BC) (2.5% w/w).
Mentions: Paddy soil was either amended with biochar (BC treatments) or left unamended (CK treatments) and then planted with rice. Rice plants were grown under ambient (CK, BC) or elevated temperature (+3 °C, tCK, tBC), or elevated CO2 (700 ppm, cCK, cBC), or simultaneously elevated temperature and CO2 (+3 °C and 700 ppm, tcCK, tcBC). Elevated temperature alone (tCK) significantly (p < 0.05) reduced total and above-ground rice biomass respectively compared to the control (CK) (Fig. 1). Elevated CO2 alone (cCK) significantly (p < 0.05) promoted the total, above-ground and root biomass of rice plants grown than the corresponding control (CK). Biochar amendment under ambient (BC) and elevated CO2 (cBC) conditions increased the total and above-ground biomass of rice plants significantly (p < 0.05) compared to their corresponding controls (CK and cCK). Moreover, biochar addition in the simultaneously elevated temperature and CO2 system significantly (p < 0.05) increased the total and above-ground biomass of rice plants, respectively.

Bottom Line: 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.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.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.

View Article: PubMed Central - PubMed

Affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, PR China.

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.

No MeSH data available.


Related in: MedlinePlus