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| Increasing the drainage period to reduce methane emissions from Chinese milk vetch（Astragalus sinicus L.） ploughed paddy field |
| Received:December 15, 2021 |
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| KeyWord:Chinese milk vetch;paddy rice;methane emissions;water management |
| Author Name | Affiliation | E-mail | | WANG Ying | Center of Cooperative Innovation for Recovery and Reconstruction of Degraded Ecosystem in Wanjiang City Belt, School of Ecology and Environment, Anhui Normal University, Wuhu 241003, China
Anhui Laboratory of Molecule-Based Materials, School of Chemistry and Materials Science, Anhui Normal University, Wuhu 241003, China | | | LIN Yutao | Center of Cooperative Innovation for Recovery and Reconstruction of Degraded Ecosystem in Wanjiang City Belt, School of Ecology and Environment, Anhui Normal University, Wuhu 241003, China | | | YANG Wenbin | Center of Cooperative Innovation for Recovery and Reconstruction of Degraded Ecosystem in Wanjiang City Belt, School of Ecology and Environment, Anhui Normal University, Wuhu 241003, China | | | WANG Jiajia | Anhui Provincial Key Laboratory of Nutrient Recycling, Resources and Environment, Soil and Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei 230001, China | | | ZUO Shuangbao | Jushi Institute of Composite Materials, Jushi Group Co., Ltd., Tongxiang 314500, China | | | SONG Zhaohui | Center of Cooperative Innovation for Recovery and Reconstruction of Degraded Ecosystem in Wanjiang City Belt, School of Ecology and Environment, Anhui Normal University, Wuhu 241003, China | | | ZHOU Nannan | Center of Cooperative Innovation for Recovery and Reconstruction of Degraded Ecosystem in Wanjiang City Belt, School of Ecology and Environment, Anhui Normal University, Wuhu 241003, China | nannanzh@ahnu.edu.cn |
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| Abstract: |
| To clarify the effects of the Chinese milk vetch(Astragalus sinicus L., CMV)returning model on methane(CH4)emissions from paddy fields and to optimize water management by increasing the drainage period to reduce CH4 emissions, a five-year in-situ field experiment was carried out from 2016 to 2020. Four treatments were designed, including non-fertilization + traditional water management (draining and drying the field at the late tillering stage for seven days,CK), conventional chemical fertilizer + traditional water management (CF), CMV + reduced nitrogen fertilizer + traditional water management(MF), and CMV + reduced nitrogen fertilizer + optimized water management(advancing and increasing five days on the basis of traditional water management, MFW). The results showed that the CH4 emissions under MF treatment ranged from 542 kg·hm-2·a-1 to 658 kg·hm-2·a-1 during the rice-growing season in the five years, and the average emissions increased by 156%~231% and 133%~196% compared with those under CK and CF treatments, respectively. Compared to those under the MF treatment, the first peak of CH4 emission(tillering stage)decayed earlier(2016, 2017, and 2019)or faster(2018 and 2020), and the annual emission significantly decreased by 16.2%~28.5%(P<0.05). Compared to those under the CF treatment, the yield from 2018 to 2020 significantly increased by 6.85%, 10.25%, and 9.79% under the MF treatment(P<0.05). The variation coefficient of yield under the MF treatment decreased, and the sustainability index increased. There was no significant difference between the yields of the MF and MFW treatments. The above results indicated that CMV return had positive effect on increasing and stabilizing rice yield, but it also increased CH4 emissions. Optimized water management could effectively decrease CH4 emissions caused by the return of CMV and simultaneously maintain the yield. |
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