Effects of fertilization reforming on the CO<sub>2</sub>flux in paddy soils with different fertilities

Lei, 张蕾 Zhang; Lichu, 尹力初 Yin; Yanan, 易亚男 Yi; Decai, 高德才 Gao; Weiwei, 付薇薇 Fu; Zehao, 王泽浩 Wang

doi:10.5846/stxb201310282596

Cited by 2 publications

(2 citation statements)

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“…) compared to the AWD practice. In contrast, AWD resulted in significantly more tillers per plant compared to the CF practice (Table 2) [35,47,48]. It was concluded that the flooded rice ecosystem function as a CO 2 sink during the day but act as the CO 2 source during the night [6].…”

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confidence: 98%

Effects of Different Water Management and Fertilizer Applications on CO2 Fluxes from a Selected Myanmar Rice (Oryza sativa L.) Cultivar

Min

Rulı́k

2020

IJPSS

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The application of nitrogen fertilizer and the water management practices are important to optimize potential yields in rice cultivation. Moreover, they may affect the emissions patterns of methane (CH4) and carbon dioxide (CO2) emission. Compared to methane, knowledge about the combined effects of different fertilizer rates together with different water management practices on CO2 fluxes are scarce. Therefore, this study aims to assess CO2 fluxes of a selected rice cultivar in response to different fertilizer applications and water management practices. The treatments included two different applications of inorganic fertilizer (recommended rate and farmer’s practice), organic manure application and water management practices; continuous flooding (CF) and alternate wetting and drying (AWD). Mean total CO2 flux in CF was -30.82 g CO2 m-2 d-1 during daytime and 29.64 g CO2 m-2 d-1 during nighttime. Surprisingly, the average net CO2 fluxes were negative under both CF (-49 mg CO2 m-2h-1) and AWD practices (-127 mg CO2 m-2h-1), indicating a net CO2 uptake by the rice plants. Inorganic fertilizer applications led to considerably higher net CO2 emissions compared to the control under both CF and AWD. Conversely, CO2 emission fluxes in the treatment with organic manure showed negative net CO2 fluxes under both water management practices and while revealing the same fresh biomass as observed in other treatments (inorganic fertilizer and control). Taken together, modifications of current cultivation systems toward using organic manure, that emit less CO2, could effectively mitigate CO2 impacts regardless of the selected water management practice.

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confidence: 98%

Effects of Different Water Management and Fertilizer Applications on CO2 Fluxes from a Selected Myanmar Rice (Oryza sativa L.) Cultivar

Min

Rulı́k

2020

IJPSS

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“…Previous studies have also shown that adopting less intensive tillage systems can effectively reduce CO 2 emissions [ 5 ]. Some researchers have suggested that no-tillage measures have minimal effect on CO 2 emissions from rice fields, that is, the CO 2 emission fluxes markedly decreased after the long-term application of organic fertilizers in lieu of chemical fertilizers while increased with the shift from non-organic fertilizers to organic fertilizers [ 6 ].…”

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confidence: 99%

Effects of Biochar Amendment on CO2 Emissions from Paddy Fields under Water-Saving Irrigation

Sung-Bum

Jiang

Sun

et al. 2018

IJERPH

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The role of carbon pool of biochar as a method of long-term C sequestration in global warming mitigation is unclear. A two-year field study was conducted to investigate the seasonal variations of CO2 emissions from water-saving irrigation paddy fields in response to biochar amendment and irrigation patterns. Three biochar treatments under water-saving irrigation and one biochar treatment under flooding irrigation were studied, and the application rates were 0, 20, 40, and 40 t ha−1 and labeled as CI + NB (controlled irrigation and none biochar added), CI + MB (controlled irrigation and medium biochar added), CI + HB (controlled irrigation and high biochar added), and FI + HB (flood irrigation and high biochar added), respectively. Results showed that biochar application at medium rates (20 t ha−1) decreased CO2 emissions by 1.64–8.83% in rice paddy fields under water-saving irrigation, compared with the non-amendment treatment. However, the CO2 emissions from paddy fields increased by 4.39–5.43% in the CI + HB treatment, compared with CI + NB. Furthermore, the mean CO2 emissions from paddy fields under water-saving irrigation decreased by 2.22% compared with flood irrigation under the same amount of biochar application (40 t ha−1). Biochar amendment increased rice yield and water use efficiency by 9.35–36.30% and 15.1–42.5%, respectively, when combined with water-saving irrigation. The CO2 emissions were reduced in the CI + MB treatment, which then increased rice yield. The CO2 emissions from paddy fields were positively correlated with temperature. The highest value of the temperature sensitivity coefficient (Q10) was derived for the CI + MB treatment. The Q10 was higher under water-saving irrigation compared with flooding irrigation.

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Effects of fertilization reforming on the CO₂flux in paddy soils with different fertilities

Cited by 2 publications

References 3 publications

Effects of Different Water Management and Fertilizer Applications on CO2 Fluxes from a Selected Myanmar Rice (Oryza sativa L.) Cultivar

Effects of Different Water Management and Fertilizer Applications on CO2 Fluxes from a Selected Myanmar Rice (Oryza sativa L.) Cultivar

Effects of Biochar Amendment on CO2 Emissions from Paddy Fields under Water-Saving Irrigation

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Effects of fertilization reforming on the CO2flux in paddy soils with different fertilities

Cited by 2 publications

References 3 publications

Effects of Different Water Management and Fertilizer Applications on CO2 Fluxes from a Selected Myanmar Rice (Oryza sativa L.) Cultivar

Effects of Different Water Management and Fertilizer Applications on CO2 Fluxes from a Selected Myanmar Rice (Oryza sativa L.) Cultivar

Effects of Biochar Amendment on CO2 Emissions from Paddy Fields under Water-Saving Irrigation

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Effects of fertilization reforming on the CO₂flux in paddy soils with different fertilities