铁氧化物对厌氧水稻土中乙酸的矿化、转化及其激发效应的影响
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1.中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室;2.中国科学院大学;3.中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,中国科学院长沙农业环境观测研究站;4.中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,中国科学院大学;5.中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,宁波大学植物病毒学研究所

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X144

基金项目:

国家自然科学基金(42007097)、长沙市自然科学基金(kq2014184)和湖南省自然科学基金(S2021JJMSXM0179)


The effect of iron oxides on mineralization, transformation and priming effect of acetate in anoxic paddy soils
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Affiliation:

1.Key Laboratory of Subtropical Agriculture Ecology,Institute of Subtropical Agriculture,Chinese Academy of Sciences;2.University of Chinese Academy of Sciences;3.Changsha Research Station for Agricultural and Environmental Monitoring, Chinese Academy of Sciences;4.Institute of Plant Virology, Ningbo University

Fund Project:

the National Natural Science Foundation of China(No. 42007097), the Natural Science Foundation of Changsha City(No. kq2014184)and Natural Science Foundation of Hunan Province(S2021JJMSXM0179)

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    摘要:

    乙酸是甲烷产生过程的重要底物,其在水稻土中的矿化和转化过程对水稻土碳循环和固碳减排具有重要意义。在长期淹水的水稻土中,铁作为重要的变价金属元素,对乙酸的矿化和转化可能具有重要影响。因此,本研究向水稻土中添加13C-乙酸、水铁矿和针铁矿,动态监测厌氧培养(100 d)期间CO2和CH4排放规律和土壤环境因子的变化规律,同时分析乙酸的矿化和转化特征以及CO2和CH4的激发效应,并解析不同铁氧化物在其中的作用效应。结果表明,培养结束后,只添加乙酸的处理中33%和36%的乙酸分别矿化为CH4和CO2,另外0.12%、2%和28%的乙酸分别形成了可溶性有机碳(DOC)、微生物量碳(MBC)和土壤有机碳(SOC)。乙酸添加引起了CO2负激发效应和CH4正激发效应。土壤产生CO2和CH4比例因乙酸的添加由3.46:1变为1.83:1。针铁矿的添加显著增加了乙酸来源的CO2累积排放量,但水铁矿对乙酸来源的CO2累积排放量却无显著影响。水铁矿和针铁矿均显著降低了SOC来源的CO2累积排放量,加剧了乙酸引起的CO2负激发效应。水铁矿和针铁矿均显著降低了乙酸来源的CH4累积排放量,对SOC来源的CH4累积排放量无显著影响。水铁矿和针铁矿显著增加了乙酸转化为MBC和SOC的比例。因此,乙酸在土壤中的矿化和转化行为会影响土壤原有有机碳产生CO2和CH4;水铁矿和针铁矿结晶程度不同,对乙酸的矿化、转化及其激发效应的影响也不同。研究结果可为稻田的固碳减排提供一定的理论依据和技术支撑。

    Abstract:

    【Objective】Acetate is an important substrate for methane production, and its mineralization and transformation are key to the carbon cycle, carbon sequestration, and greenhouse gas mitigation in paddy soils. In long-term flooded paddy soils, iron, an important valence-variable metal, may influence the mineralization and transformation of acetate. 【Method】 Therefore, 13C-acetate, ferrihydrite and goethite were added into paddy soil and the CO2 and CH4 emissions were monitored. Also, the changes in paddy soil properties during anaerobic incubation (100 days) were analyzed. Additionally, we analyzed the characteristics of mineralization and transformation of acetate and its priming effect on CO2 and CH4 to reveal the roles of different types of iron oxides. 【Result】The results showed that in the acetate treatment after incubation, 33% and 36% of acetate was mineralized to CH4 and CO2, respectively, while 0.12%, 2% and 28% were transformed to dissolved organic carbon (DOC), microbial biomass carbon (MBC) and soil organic carbon (SOC), respectively. Acetate caused a negative CO2 priming effect and a positive CH4 priming effect. The ratio of CO2 to CH4 sourced from soil organic carbon was changed from 3.46:1 to 1.83:1 by acetate addition. Goethite addition significantly increased acetate derived cumulative CO2 emission, while ferrihydrite showed no significant effect. Ferrihydrite and goethite significantly decreased SOC derived CO2 emission and strengthened the negative CO2 priming effect of acetate. Also, ferrihydrite and goethite significantly decreased acetate derived CH4 emission and showed no significant effect on SOC derived CH4 emission. The proportions of acetate transformed to MBC and SOC were significantly increased in the presence of ferrihydrite and goethite. 【Conclusion】The mineralization and transformation of acetate influenced CO2 and CH4 emission from native SOC. Ferrihydrite and goethite, different in crystallinity, have different effects on mineralization, transformation and priming effect of acetate. Thus, this study can provide theoretical and technical support for carbon sequestration and greenhouse gas mitigation in paddy soils.

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王云秋,李宇虹,祝贞科,吴金水,葛体达.铁氧化物对厌氧水稻土中乙酸的矿化、转化及其激发效应的影响[J].土壤学报,,[待发表]
WANG Yunqiu, LI Yuhong, ZHU Zhenke, WU Jinshui, GE Tida. The effect of iron oxides on mineralization, transformation and priming effect of acetate in anoxic paddy soils[J]. Acta Pedologica Sinica,,[In Press]

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