Emission and distribution of phosphine in paddy fields and its relationship with greenhouse gases

The Science of the Total Environment
Weiyi ChenXiaohong Gu

Abstract

Phosphine (PH3), as a gaseous phosphide, plays an important role in the phosphorus cycle in ecosystems. In this study, the emission and distribution of phosphine, carbon dioxide (CO2) and methane (CH4) in paddy fields were investigated to speculate the future potential impacts of enhanced greenhouse effect on phosphorus cycle involved in phosphine by the method of Pearson correlation analysis and multiple linear regression analysis. During the whole period of rice growth, there was a significant positive correlation between CO2emission flux and PH3emission flux (r=0.592, p=0.026, n=14). Similarly, a significant positive correlation of emission flux was also observed between CH4and PH3(r=0.563, p=0.036, n=14). The linear regression relationship was determined as [PH3]flux=0.007[CO2]flux+0.063[CH4]flux-4.638. No significant differences were observed for all values of matrix-bound phosphine (MBP), soil carbon dioxide (SCO2), and soil methane (SCH4) in paddy soils. However, there was a significant positive correlation between MBP and SCO2at heading, flowering and ripening stage. The correlation coefficients were 0.909, 0.890 and 0.827, respectively. In vertical distribution, MBP had the analogical variation trend with SCO2and SCH4....Continue Reading

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Citations

Nov 23, 2019·Astrobiology·Clara Sousa-SilvaWilliam Bains
Dec 24, 2018·The Science of the Total Environment·William BainsSara Seager

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