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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

Seasonal variation of CH4 emission flux under different temperature and CO2 concentration with and without BC amendment (a) ambient; (b) elevated temperature; (c) elevated CO2; (d) elevated temperature and CO2 simultaneously) during the whole rice growing season, and the cumulative CH4 emissions in different treatments. The total cumulative methane emissions from 0 to 135 days are shown in Supplementary Fig. S1 in the “Supplementary Information”. Treatment designations of the cumulative CH4 emissions are showed below each column and different letters indicate significant differences between the eight treatments (p < 0.05). Treatment legend is given in Fig. 1.
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f2: Seasonal variation of CH4 emission flux under different temperature and CO2 concentration with and without BC amendment (a) ambient; (b) elevated temperature; (c) elevated CO2; (d) elevated temperature and CO2 simultaneously) during the whole rice growing season, and the cumulative CH4 emissions in different treatments. The total cumulative methane emissions from 0 to 135 days are shown in Supplementary Fig. S1 in the “Supplementary Information”. Treatment designations of the cumulative CH4 emissions are showed below each column and different letters indicate significant differences between the eight treatments (p < 0.05). Treatment legend is given in Fig. 1.

Mentions: There was a similar trend of CH4 emission flux across all treatments during the overall rice growing season with the peak occurring at the heading stage (Fig. 2). The CH4 emission flux in tCK and cCK at the heading stage was much lower compared to that in CK, but higher in tcCK. Biochar amendment, to some extent, reduced the CH4 emission flux from paddy soil under all experimental conditions. The cumulative CH4 emissions from the paddy soils during the overall rice growing season showed remarkable differences among all treatments (Fig. 2). In contrast to CK, the cumulative CH4 emissions from tCK and cCK were significantly lower (p < 0.05). No significant difference in the cumulative CH4 emissions was observed between tcCK and CK. Biochar addition reduced CH4 emissions under ambient conditions remarkably (p < 0.05), ranging from 171.2 mg kg−1 dry weight soil, dws to 4.8 mg kg−1 dws. The addition of biochar either under elevated temperature or elevated CO2 had no significant impact on the cumulative CH4 emissions. Nevertheless, the application of biochar played a notable role in reducing the cumulative CH4 emissionsfrom paddy soil under simultaneously elevated temperature and CO2 conditions (p < 0.05). There was a significantly (p < 0.05) lower cumulative CH4 emissions from tcBC (112.2 mg kg−1 dws) than that from tcCK (185.4 mg kg−1 dws).


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)

Seasonal variation of CH4 emission flux under different temperature and CO2 concentration with and without BC amendment (a) ambient; (b) elevated temperature; (c) elevated CO2; (d) elevated temperature and CO2 simultaneously) during the whole rice growing season, and the cumulative CH4 emissions in different treatments. The total cumulative methane emissions from 0 to 135 days are shown in Supplementary Fig. S1 in the “Supplementary Information”. Treatment designations of the cumulative CH4 emissions are showed below each column and different letters indicate significant differences between the eight treatments (p < 0.05). Treatment legend is given in Fig. 1.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2: Seasonal variation of CH4 emission flux under different temperature and CO2 concentration with and without BC amendment (a) ambient; (b) elevated temperature; (c) elevated CO2; (d) elevated temperature and CO2 simultaneously) during the whole rice growing season, and the cumulative CH4 emissions in different treatments. The total cumulative methane emissions from 0 to 135 days are shown in Supplementary Fig. S1 in the “Supplementary Information”. Treatment designations of the cumulative CH4 emissions are showed below each column and different letters indicate significant differences between the eight treatments (p < 0.05). Treatment legend is given in Fig. 1.
Mentions: There was a similar trend of CH4 emission flux across all treatments during the overall rice growing season with the peak occurring at the heading stage (Fig. 2). The CH4 emission flux in tCK and cCK at the heading stage was much lower compared to that in CK, but higher in tcCK. Biochar amendment, to some extent, reduced the CH4 emission flux from paddy soil under all experimental conditions. The cumulative CH4 emissions from the paddy soils during the overall rice growing season showed remarkable differences among all treatments (Fig. 2). In contrast to CK, the cumulative CH4 emissions from tCK and cCK were significantly lower (p < 0.05). No significant difference in the cumulative CH4 emissions was observed between tcCK and CK. Biochar addition reduced CH4 emissions under ambient conditions remarkably (p < 0.05), ranging from 171.2 mg kg−1 dry weight soil, dws to 4.8 mg kg−1 dws. The addition of biochar either under elevated temperature or elevated CO2 had no significant impact on the cumulative CH4 emissions. Nevertheless, the application of biochar played a notable role in reducing the cumulative CH4 emissionsfrom paddy soil under simultaneously elevated temperature and CO2 conditions (p < 0.05). There was a significantly (p < 0.05) lower cumulative CH4 emissions from tcBC (112.2 mg kg−1 dws) than that from tcCK (185.4 mg kg−1 dws).

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