Drainage and tillage practices in the winter fallow season mitigate CH4 and N2O emissions from a double-rice field in China
Item
Title (Dublin Core)
Drainage and tillage practices in the winter fallow season mitigate CH4
and N2O emissions from a double-rice field in China
and N2O emissions from a double-rice field in China
Description (Dublin Core)
Traditional land management (no tillage, no drainage, NTND) during the winter fallow season results in substantial CH<sub>4</sub> and N<sub>2</sub>O emissions from double-rice fields in China. A field experiment was conducted to investigate the effects of drainage and tillage during the winter fallow season on CH<sub>4</sub> and N<sub>2</sub>O emissions and to develop mitigation options. The experiment had four treatments: NTND, NTD (drainage but no tillage), TND (tillage but no drainage), and TD (both drainage and tillage). The study was conducted from 2010 to 2014 in a Chinese double-rice field. During winter, total precipitation and mean daily temperature significantly affected CH<sub>4</sub> emission. Compared to NTND, drainage and tillage decreased annual CH<sub>4</sub> emissions in early- and late-rice seasons by 54 and 33 kg CH<sub>4</sub> ha<sup>−1</sup> yr<sup>−1</sup>, respectively. Drainage and tillage increased N<sub>2</sub>O emissions in the winter fallow season but reduced it in early- and late-rice seasons, resulting in no annual change in N<sub>2</sub>O emission. Global warming potentials of CH<sub>4</sub> and N<sub>2</sub>O emissions were decreased by 1.49 and 0.92 t CO<sub>2</sub> eq. ha<sup>−1</sup> yr<sup>−1</sup>, respectively, and were reduced more by combining drainage with tillage, providing a mitigation potential of 1.96 t CO<sub>2</sub> eq. ha<sup>−1</sup> yr<sup>−1</sup>. A low total C content and high C / N ratio in rice residues showed that tillage in the winter fallow season reduced CH<sub>4</sub> and N<sub>2</sub>O emissions in both early- and late-rice seasons. Drainage and tillage significantly decreased the abundance of methanogens in paddy soil, and this may explain the decrease of CH<sub>4</sub> emissions. Greenhouse gas intensity was significantly decreased by drainage and tillage separately, and the reduction was greater by combining drainage with tillage, resulting in a reduction of 0.17 t CO<sub>2</sub> eq. t<sup>−1</sup>. The results indicate that drainage combined with tillage during the winter fallow season is an effective strategy for mitigating greenhouse gas releases from double-rice fields.
Creator (Dublin Core)
Zhang, Guangbin
Yu, Haiyang
Fan, Xianfang
Yang, Yuting
Ma, Jing
Xu, Hua
Date (Dublin Core)
2018-09-13
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-16-11853-2016
https://acp.copernicus.org/articles/16/11853/2016/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
