Contributions of photosynthate carbon to methane emissions from rice paddies cultivated using different organic amendment methods: Results from an in-situ C-13-labelling study

文献类型： 外文期刊

第一作者： Wang, Cong

作者： Wang, Cong;Sun, Huifeng;Zhang, Xianxian;Zhang, Jining;Zhou, Sheng;Wang, Cong;Sun, Huifeng;Zhang, Xianxian;Zhang, Jining;Zhou, Sheng

作者机构：

关键词： Rice paddy; Organic amendment; Wheat straw; Chinese milk vetch; Stable isotope

期刊名称：GEODERMA （ 影响因子：6.114； 五年影响因子：6.183 ）

ISSN： 0016-7061

年卷期： 2021 年 402 卷

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收录情况： SCI

摘要： A field experiment was conducted in Shanghai, China, to examine whether different organic amendment methods can influence the emissions of methane (CH4) from a rice paddy by regulating the availability of photosynthate carbon (C), which is the methanogenic substrate for the production of CH4. Three treatments involving different organic amendment methods, rice-wheat without organic amendment (RW), rice-wheat with straw incorporation (RW-S) and Chinese milk vetch-rice with green manure incorporation (RM), were employed during the 2018 rice growing season. The results showed that, compared with the RW treatment, the RW-S and RM treatments significantly increased photosynthate C-induced CH4 emissions by factors of 5.55 and 1.74 in the tillering stage and 6.03 and 1.62 in the booting stage, respectively. However, the contribution ratios of the photosynthate C-induced CH4 fluxes to the gross fluxes of CH4 in descending order were RM > RW > RW-S, which can be attributed to background differences in CH4 fluxes among the different organic amendment methods. Compared with the tillering stage, the average contribution ratios of photosynthate C-induced CH4 emissions in the booting stage were 1.59, 4.43 and 2.46 times higher for the RW, RW-S and RM treatments, respectively. These results indicated that the different organic amendment methods affected CH4 emissions from the rice paddies not only via direct C inputs but also by influencing the availability of rice photosynthate C in rhizosphere.

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