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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

Methanogenic (a) and CH4 oxidation activity (b) in the rhizosphere soil at the tillering and heading stages in different treatments. Different letters indicate significant differences between the eight treatments at the same rice stage (p < 0.05). Treatment legend is given in Fig. 1.
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f3: Methanogenic (a) and CH4 oxidation activity (b) in the rhizosphere soil at the tillering and heading stages in different treatments. Different letters indicate significant differences between the eight treatments at the same rice stage (p < 0.05). Treatment legend is given in Fig. 1.

Mentions: Variations of methanogenic and CH4 oxidation activity in rhizosphere soils at the tillering and the heading stages are presented in Fig. 3. Although there were no significant differences in soil methanogenic activity among CK, tCK, cCK and tcCK at the tilling stage, significantly (p < 0.05) lower activity in tCK (10.7 μmol CH4 kg−1 dws h−1) and cCK (11.2 μmol CH4 kg−1 dws h−1) was detected at the heading stage as compared with that in CK (12.1 μmol CH4 kg−1 dws h−1) (Fig. 3a). The addition of biochar resulted in a significant reduction of methanogenic activity both at the tillering and heading stage under all conditions tested (p < 0.05), with the exception of the elevated CO2 at the heading phase (Fig. 3a). The soil CH4 oxidation activity in CK was much higher at the tilling stage in comparison with any other treatments (Fig. 3b). At the heading stage, despite no significant differences in the soil CH4 oxidation activity of tCK, cCK or tcCK in contrast to that of CK, biochar addition exerted a marked influence on the soil CH4 oxidation potential under different conditions. The CH4 oxidation activity in the BC and tcBC treatments was increased by 79.0% and 162.3% as compared to their corresponding controls (CK, tcCK) (p < 0.05) (Fig. 3b).


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)

Methanogenic (a) and CH4 oxidation activity (b) in the rhizosphere soil at the tillering and heading stages in different treatments. Different letters indicate significant differences between the eight treatments at the same rice stage (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

f3: Methanogenic (a) and CH4 oxidation activity (b) in the rhizosphere soil at the tillering and heading stages in different treatments. Different letters indicate significant differences between the eight treatments at the same rice stage (p < 0.05). Treatment legend is given in Fig. 1.
Mentions: Variations of methanogenic and CH4 oxidation activity in rhizosphere soils at the tillering and the heading stages are presented in Fig. 3. Although there were no significant differences in soil methanogenic activity among CK, tCK, cCK and tcCK at the tilling stage, significantly (p < 0.05) lower activity in tCK (10.7 μmol CH4 kg−1 dws h−1) and cCK (11.2 μmol CH4 kg−1 dws h−1) was detected at the heading stage as compared with that in CK (12.1 μmol CH4 kg−1 dws h−1) (Fig. 3a). The addition of biochar resulted in a significant reduction of methanogenic activity both at the tillering and heading stage under all conditions tested (p < 0.05), with the exception of the elevated CO2 at the heading phase (Fig. 3a). The soil CH4 oxidation activity in CK was much higher at the tilling stage in comparison with any other treatments (Fig. 3b). At the heading stage, despite no significant differences in the soil CH4 oxidation activity of tCK, cCK or tcCK in contrast to that of CK, biochar addition exerted a marked influence on the soil CH4 oxidation potential under different conditions. The CH4 oxidation activity in the BC and tcBC treatments was increased by 79.0% and 162.3% as compared to their corresponding controls (CK, tcCK) (p < 0.05) (Fig. 3b).

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