Ting Bao , Ling Wang , Yuanfa Huang , Huixin Li , Lanying Qiu , Jiujie Liu , Linlin Shi , Yunlong Liu , Haoyu Qian , Yanfeng Ding , Yu Jiang
{"title":"[CO2]升高可减少稻田就地掺入秸秆后的甲烷排放量","authors":"Ting Bao , Ling Wang , Yuanfa Huang , Huixin Li , Lanying Qiu , Jiujie Liu , Linlin Shi , Yunlong Liu , Haoyu Qian , Yanfeng Ding , Yu Jiang","doi":"10.1016/j.agee.2024.109055","DOIUrl":null,"url":null,"abstract":"<div><p>Rice paddies contribute to ∼48% of greenhouse gas emissions from cropland, with ∼94% from methane (CH<sub>4</sub>). Elevated atmospheric CO<sub>2</sub> concentrations (eCO<sub>2</sub>) due to human activities, generally stimulate the rice growth, and in turn affect CH<sub>4</sub> emissions from rice paddies. However, the effects of eCO<sub>2</sub> on CH<sub>4</sub> emissions from rice paddies are still unclear under <em>in situ</em> straw incorporation, the popular agricultural practice. Therefore, we conducted a 3-yr field experiment to investigate the effects of eCO<sub>2</sub> on CH<sub>4</sub> emissions under <em>in situ</em> straw incorporation in the rice-wheat cropping system, using the open-top chamber technology. We found that eCO<sub>2</sub> reduced the CH<sub>4</sub> emissions from rice paddies by 10.9–23.8%, but increased rice plant biomass by 4.2–35.6%. The eCO<sub>2</sub> reduced the soil NH<sub>4</sub><sup>+</sup> and NO<sub>3</sub><sup>-</sup> concentrations, but did not affect the soil dissolved organic C. The eCO<sub>2</sub> did not affect the abundance of methanogens and CH<sub>4</sub> production potential, whereas it stimulated the abundance of methanotrophs and CH<sub>4</sub> oxidation potential by 102.5% and 15.1%, respectively. The eCO<sub>2</sub> also shifted the community composition of methanotrophs and reduced the relative abundance of type Ⅱ methanotrophs by 8.5%. The random forest analysis identified that soil CH<sub>4</sub> oxidation potential is the most important factor affecting CH<sub>4</sub> emissions. Our findings indicate that eCO<sub>2</sub> can reduce the CH<sub>4</sub> emissions from rice paddies under <em>in situ</em> straw incorporation mainly through increasing the soil CH<sub>4</sub> oxidation potential. Our study suggests the effects of eCO<sub>2</sub> on CH<sub>4</sub> emissions from global paddies may be overestimated and underline the need for smart agricultural management to reduce CH<sub>4</sub> emissions.</p></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":null,"pages":null},"PeriodicalIF":6.0000,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Elevated [CO2] reduces CH4 emissions from rice paddies under in situ straw incorporation\",\"authors\":\"Ting Bao , Ling Wang , Yuanfa Huang , Huixin Li , Lanying Qiu , Jiujie Liu , Linlin Shi , Yunlong Liu , Haoyu Qian , Yanfeng Ding , Yu Jiang\",\"doi\":\"10.1016/j.agee.2024.109055\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Rice paddies contribute to ∼48% of greenhouse gas emissions from cropland, with ∼94% from methane (CH<sub>4</sub>). Elevated atmospheric CO<sub>2</sub> concentrations (eCO<sub>2</sub>) due to human activities, generally stimulate the rice growth, and in turn affect CH<sub>4</sub> emissions from rice paddies. However, the effects of eCO<sub>2</sub> on CH<sub>4</sub> emissions from rice paddies are still unclear under <em>in situ</em> straw incorporation, the popular agricultural practice. Therefore, we conducted a 3-yr field experiment to investigate the effects of eCO<sub>2</sub> on CH<sub>4</sub> emissions under <em>in situ</em> straw incorporation in the rice-wheat cropping system, using the open-top chamber technology. We found that eCO<sub>2</sub> reduced the CH<sub>4</sub> emissions from rice paddies by 10.9–23.8%, but increased rice plant biomass by 4.2–35.6%. The eCO<sub>2</sub> reduced the soil NH<sub>4</sub><sup>+</sup> and NO<sub>3</sub><sup>-</sup> concentrations, but did not affect the soil dissolved organic C. The eCO<sub>2</sub> did not affect the abundance of methanogens and CH<sub>4</sub> production potential, whereas it stimulated the abundance of methanotrophs and CH<sub>4</sub> oxidation potential by 102.5% and 15.1%, respectively. The eCO<sub>2</sub> also shifted the community composition of methanotrophs and reduced the relative abundance of type Ⅱ methanotrophs by 8.5%. The random forest analysis identified that soil CH<sub>4</sub> oxidation potential is the most important factor affecting CH<sub>4</sub> emissions. Our findings indicate that eCO<sub>2</sub> can reduce the CH<sub>4</sub> emissions from rice paddies under <em>in situ</em> straw incorporation mainly through increasing the soil CH<sub>4</sub> oxidation potential. Our study suggests the effects of eCO<sub>2</sub> on CH<sub>4</sub> emissions from global paddies may be overestimated and underline the need for smart agricultural management to reduce CH<sub>4</sub> emissions.</p></div>\",\"PeriodicalId\":7512,\"journal\":{\"name\":\"Agriculture, Ecosystems & Environment\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.0000,\"publicationDate\":\"2024-05-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Agriculture, Ecosystems & Environment\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0167880924001737\",\"RegionNum\":1,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"AGRICULTURE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Agriculture, Ecosystems & Environment","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167880924001737","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURE, MULTIDISCIPLINARY","Score":null,"Total":0}
Elevated [CO2] reduces CH4 emissions from rice paddies under in situ straw incorporation
Rice paddies contribute to ∼48% of greenhouse gas emissions from cropland, with ∼94% from methane (CH4). Elevated atmospheric CO2 concentrations (eCO2) due to human activities, generally stimulate the rice growth, and in turn affect CH4 emissions from rice paddies. However, the effects of eCO2 on CH4 emissions from rice paddies are still unclear under in situ straw incorporation, the popular agricultural practice. Therefore, we conducted a 3-yr field experiment to investigate the effects of eCO2 on CH4 emissions under in situ straw incorporation in the rice-wheat cropping system, using the open-top chamber technology. We found that eCO2 reduced the CH4 emissions from rice paddies by 10.9–23.8%, but increased rice plant biomass by 4.2–35.6%. The eCO2 reduced the soil NH4+ and NO3- concentrations, but did not affect the soil dissolved organic C. The eCO2 did not affect the abundance of methanogens and CH4 production potential, whereas it stimulated the abundance of methanotrophs and CH4 oxidation potential by 102.5% and 15.1%, respectively. The eCO2 also shifted the community composition of methanotrophs and reduced the relative abundance of type Ⅱ methanotrophs by 8.5%. The random forest analysis identified that soil CH4 oxidation potential is the most important factor affecting CH4 emissions. Our findings indicate that eCO2 can reduce the CH4 emissions from rice paddies under in situ straw incorporation mainly through increasing the soil CH4 oxidation potential. Our study suggests the effects of eCO2 on CH4 emissions from global paddies may be overestimated and underline the need for smart agricultural management to reduce CH4 emissions.
期刊介绍:
Agriculture, Ecosystems and Environment publishes scientific articles dealing with the interface between agroecosystems and the natural environment, specifically how agriculture influences the environment and how changes in that environment impact agroecosystems. Preference is given to papers from experimental and observational research at the field, system or landscape level, from studies that enhance our understanding of processes using data-based biophysical modelling, and papers that bridge scientific disciplines and integrate knowledge. All papers should be placed in an international or wide comparative context.