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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

The correlation circle of CH4 emission and biochemical and microbial characteristics during the rice growing season.Dim 1 and Dim 2 represent the ratio of respective index in the whole system.
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f5: The correlation circle of CH4 emission and biochemical and microbial characteristics during the rice growing season.Dim 1 and Dim 2 represent the ratio of respective index in the whole system.

Mentions: Interestingly, biochar amendment also significantly decreased CH4 emission from paddy soil under simultaneously elevated temperature and CO2 condition. Compared to the corresponding control (tcCK), the cumulative CH4 emissions in tcBC were reduced by 39.5% (Fig. 2d). Based on the role of biochar in decreasing CH4 emission under ambient environmental conditions, we hypothesized that biochar addition would have notable influence on CH4 production and oxidation under the combined condition. As was expected, methanogenic activity decreased and CH4 oxidation potential increased when biochar was applied in simultaneously elevated temperature and CO2 system at the heading stage (Fig. 3). Spearman correlations and the correlation circle were calculated to compare the CH4 emission rates with biochemical and microbial gene data. We observed a significantly positive correlation between CH4 emission rate and methanogenic activity (rho = 0.500, p < 0.01) and CH4 oxidation activity (rho = 0.533, p < 0.01) (Fig. 5; Supplementary Table S1). This confirms the important role that methanogenic activity and CH4 oxidation activity have in controlling CH4 emission from paddy soil.


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)

The correlation circle of CH4 emission and biochemical and microbial characteristics during the rice growing season.Dim 1 and Dim 2 represent the ratio of respective index in the whole system.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: The correlation circle of CH4 emission and biochemical and microbial characteristics during the rice growing season.Dim 1 and Dim 2 represent the ratio of respective index in the whole system.
Mentions: Interestingly, biochar amendment also significantly decreased CH4 emission from paddy soil under simultaneously elevated temperature and CO2 condition. Compared to the corresponding control (tcCK), the cumulative CH4 emissions in tcBC were reduced by 39.5% (Fig. 2d). Based on the role of biochar in decreasing CH4 emission under ambient environmental conditions, we hypothesized that biochar addition would have notable influence on CH4 production and oxidation under the combined condition. As was expected, methanogenic activity decreased and CH4 oxidation potential increased when biochar was applied in simultaneously elevated temperature and CO2 system at the heading stage (Fig. 3). Spearman correlations and the correlation circle were calculated to compare the CH4 emission rates with biochemical and microbial gene data. We observed a significantly positive correlation between CH4 emission rate and methanogenic activity (rho = 0.500, p < 0.01) and CH4 oxidation activity (rho = 0.533, p < 0.01) (Fig. 5; Supplementary Table S1). This confirms the important role that methanogenic activity and CH4 oxidation activity have in controlling CH4 emission from paddy soil.

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