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| Greenhouse gas intensity from different cultivars of ratoon rice fields in Taihu Lake region, China |
| Received:March 04, 2022 |
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| KeyWord:Taihu Lake region;ratoon rice;greenhouse gas intensity;yield;rice cultivar |
| Author Name | Affiliation | E-mail | | FAN Di | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LI Ruolin | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | MA Jing | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHANG Guangbin | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | XU Hua | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | hxu@issas.ac.cn |
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| Abstract: |
| To clarify the feasibility of ratoon rice cultivation in the Taihu Lake region and its effect on greenhouse gas emissions, a field experiment was conducted from April to October in 2021, using the static chamber-gas chromatography technique and adopting five cultivars of ratoon rice[Hanyou 73(H73), Yongyou 2640(Y2640), Fengliangyouxiang 1(F1), C Liangyouhuazhan(CZ), and Liangyou 6326 (L6326)]. The results showed that the CH4 fluxes reached peak during the tillering and heading of main rice crop season and early ratoon season. Seasonal cumulative CH4 emissions ranged from 209 to 289 kg·hm-2, of which 8.3%~23.0% was attributed to the ratoon season. Total CH4 emission from L6326 was the highest, which was obviously higher than that from H73, Y2640, and F1(P<0.05). The N2O flux peaks were mainly measured during the periods of nitrogen fertilization and soil moisture drastic changes. The seasonal N2O emissions ranged from 0.386 to 0.548 kg·hm-2, with 0.5%~2.4% in ratoon season. There was no significant difference in N2O emissions among the five rice cultivars. Total rice yield was 6.12~12.62 t·hm-2, and the ratoon rice contributed 23.8%~36.7%. The yields of Y2640 and F1 were relatively higher than those of other three rice cultivars. As a whole, the greenhouse gas intensity ranged from 0.50 to 1.35 t CO2 e·t-1, with the lowest and highest values observed in Y2640 and L6326, respectively. Based on these findings, the Y2640 and F1 rice cultivars could be potentially planted in Taihu Lake region owing to their relatively higher yields and lower greenhouse gas intensity. |
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