A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The effects of current water management practices on methane emissions in Japanese rice cultivation
Abstract Cultivated wetland rice fields are a source of methane ($ CH_{4} $) emissions. To estimate $ CH_{4} $ emissions and develop policies to reduce such emissions, information on water management at the farm level is crucial. It is known that farmers implement midseason drainage (MD) to increase rice yields and save water. However, little is known about whether MD is carried out in soils where $ CH_{4} $ emissions are high and how part-time status will influence management. The objective of this study is to identify factors that determine MD implementation using a binomial logistic regression model based on a farm-level survey in Japan and to indicate possible changes in estimates of $ CH_{4} $ emissions, accounting for current water management practices. The implementation rates were significantly higher where the soil types were classified as having the potential for high $ CH_{4} $ emissions. Under current water management practices, the duration of MD and the percentage of continuous flooding were 5 to 7 days longer and approximately 7 % higher, respectively, than the values used by the Greenhouse Gas Inventory Office of Japan, which in turn are used to report greenhouse gas emissions to the United Nations Framework Convention on Climate Change. By accounting for current water conditions with the Tier 2 method, this study indicates that national estimates of $ CH_{4} $ emissions from rice straw application areas could be lowered by 12.7 %. These results may contribute to the development of a mitigation policy that will help to further reduce $ CH_{4} $ emissions.
The effects of current water management practices on methane emissions in Japanese rice cultivation
Abstract Cultivated wetland rice fields are a source of methane ($ CH_{4} $) emissions. To estimate $ CH_{4} $ emissions and develop policies to reduce such emissions, information on water management at the farm level is crucial. It is known that farmers implement midseason drainage (MD) to increase rice yields and save water. However, little is known about whether MD is carried out in soils where $ CH_{4} $ emissions are high and how part-time status will influence management. The objective of this study is to identify factors that determine MD implementation using a binomial logistic regression model based on a farm-level survey in Japan and to indicate possible changes in estimates of $ CH_{4} $ emissions, accounting for current water management practices. The implementation rates were significantly higher where the soil types were classified as having the potential for high $ CH_{4} $ emissions. Under current water management practices, the duration of MD and the percentage of continuous flooding were 5 to 7 days longer and approximately 7 % higher, respectively, than the values used by the Greenhouse Gas Inventory Office of Japan, which in turn are used to report greenhouse gas emissions to the United Nations Framework Convention on Climate Change. By accounting for current water conditions with the Tier 2 method, this study indicates that national estimates of $ CH_{4} $ emissions from rice straw application areas could be lowered by 12.7 %. These results may contribute to the development of a mitigation policy that will help to further reduce $ CH_{4} $ emissions.
The effects of current water management practices on methane emissions in Japanese rice cultivation
Leon, Ai (author) / Kohyama, Kazunori (author) / Yagi, Kazuyuki (author) / Takata, Yusuke (author) / Obara, Hiroshi (author)
2015
Article (Journal)
Electronic Resource
English
BKL:
43.47
Globale Umweltprobleme
/
43.47$jGlobale Umweltprobleme
Investigations of methane emissions from rice cultivation in Indian context
| Online Contents | 2005
Cultural Practices in the Cultivation of Rice
| Taylor & Francis Verlag | 1981