Effect of Paddy-Upland Rotation System on the Net Greenhouse Gas Balance as the Sum of Methane and Nitrous Oxide Emissions and Soil Carbon Storage: A Case in Western Japan

Hiroyuki Hasukawa, Yumi Inoda, Satoshi Toritsuka, Shigeto Sudo, Noriko Oura, Tomohito Sano, Yasuhito Shirato and Junta Yanai
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Hiroyuki Hasukawa: Agricultural Technology Promotion Center of Shiga Prefecture, Omihachiman 521-1301, Japan
Yumi Inoda: Agricultural Technology Promotion Center of Shiga Prefecture, Omihachiman 521-1301, Japan
Satoshi Toritsuka: Agricultural Technology Promotion Center of Shiga Prefecture, Omihachiman 521-1301, Japan
Shigeto Sudo: NARO Institute for Agro-Environmental Science, Tsukuba 305-8604, Japan
Noriko Oura: NARO Institute for Agro-Environmental Science, Tsukuba 305-8604, Japan
Tomohito Sano: NARO Institute for Agro-Environmental Science, Tsukuba 305-8604, Japan
Yasuhito Shirato: NARO Institute for Agro-Environmental Science, Tsukuba 305-8604, Japan
Junta Yanai: Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto 606-8522, Japan

Agriculture, 2021, vol. 11, issue 1, 1-16

Abstract: To investigate the effect of paddy-upland (PU) rotation system on greenhouse gas emissions, methane (CH 4 ) and nitrous oxide (N 2 O) emissions were monitored for three years for a PU rotation field (four cultivations (wheat-soybean-rice-rice) over three years) and continuous paddy (CP) field on alluvial soil in western Japan. Soil carbon storage was also calculated using an improved Rothamsted Carbon (RothC) model. The net greenhouse gas balance was finally evaluated as the sum of CO 2 eq of the CH 4 , N 2 O and changes in soil carbon storage. The average CH 4 emissions were significantly lower and the average N 2 O emissions were significantly higher in the PU field than those in the CP field ( p < 0.01). On CO 2 equivalent basis, CH 4 emissions were much higher than N 2 O emission. In total, the average CO 2 eq emissions of CH 4 plus N 2 O in the PU field (1.81 Mg CO 2 ha −1 year −1 ) were significantly lower than those in the CP field (7.42 Mg CO 2 ha −1 year −1 ) ( p < 0.01). The RothC model revealed that the changes in soil carbon storage corresponded to CO 2 eq emissions of 0.57 and 0.09 Mg CO 2 ha −1 year −1 in the both fields, respectively. Consequently, the net greenhouse gas balance in the PU and CP fields were estimated to be 2.38 and 7.51 Mg CO 2 ha −1 year −1 , respectively, suggesting a 68% reduction in the PU system. In conclusion, PU rotation system can be regarded as one type of the climate-smart soil management.

Keywords: greenhouse gases emissions; methane; nitrous oxide; paddy-upland rotation; soil carbon storage (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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