Li’e Wei , Kailun Song , YanYan Qi , Shipeng Sun , Guorong Ni , Chunhuo Zhou , Xin Yin
{"title":"Effects of straw returning after anaerobic microbial pretreatment on soil carbon sequestration and emission reduction","authors":"Li’e Wei , Kailun Song , YanYan Qi , Shipeng Sun , Guorong Ni , Chunhuo Zhou , Xin Yin","doi":"10.1016/j.eti.2025.104124","DOIUrl":null,"url":null,"abstract":"<div><div>Soil carbon sequestration benefits are critical for agricultural development, and irrational agricultural waste disposal practices can lead to significant carbon emissions. Returning straw is known to enhance soil organic carbon, making strategies to accelerate straw degradation highly valuable for agricultural carbon sequestration. Anaerobes have demonstrated strong capabilities in accelerating lignocellulose degradation. However, the influence of straw on the transformation process of carbon, and the priming effect of soil carbon, needs to be further explored. This study utilized rumen microorganisms with mainly anaerobes for straw pretreatment, and employed isotope tracer method to simulate carbon transformation after straw returning. The pretreatment of <sup>13</sup>C-labelled straw with RMs for 6 hours significantly increased its decomposition rate by 79.37 %. While the cumulative CH<sub>4</sub> emission flux rose, along with an increase in the abundance of methanogen-associated mcrA genes, the total soil carbon content increased by 61.79 % over a 60-day experimental period. Enzyme activities in the soil increased significantly, facilitating lignocellulose breakdown. Canonical correspondence analysis indicated that CH<sub>4</sub> emissions were attributed to increased abundance of the anaerobes, while increased CO<sub>2</sub> emissions were associated with soil carbon sequestration. Meanwhile, the <em>Proteobacteria</em> is involved in soil carbon sequestration and CO<sub>2</sub> production. These results suggest that anaerobic microorganisms exhibit high efficiency in accelerating straw degradation rates and enhancing soil carbon content following a 6-hour pretreatment of straw. The capacity of anaerobic microorganisms to convert solid waste has been shown, and highlights their robust potential for agricultural waste management and carbon sequestration.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"38 ","pages":"Article 104124"},"PeriodicalIF":6.7000,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Technology & Innovation","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2352186425001105","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"BIOTECHNOLOGY & APPLIED MICROBIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Soil carbon sequestration benefits are critical for agricultural development, and irrational agricultural waste disposal practices can lead to significant carbon emissions. Returning straw is known to enhance soil organic carbon, making strategies to accelerate straw degradation highly valuable for agricultural carbon sequestration. Anaerobes have demonstrated strong capabilities in accelerating lignocellulose degradation. However, the influence of straw on the transformation process of carbon, and the priming effect of soil carbon, needs to be further explored. This study utilized rumen microorganisms with mainly anaerobes for straw pretreatment, and employed isotope tracer method to simulate carbon transformation after straw returning. The pretreatment of 13C-labelled straw with RMs for 6 hours significantly increased its decomposition rate by 79.37 %. While the cumulative CH4 emission flux rose, along with an increase in the abundance of methanogen-associated mcrA genes, the total soil carbon content increased by 61.79 % over a 60-day experimental period. Enzyme activities in the soil increased significantly, facilitating lignocellulose breakdown. Canonical correspondence analysis indicated that CH4 emissions were attributed to increased abundance of the anaerobes, while increased CO2 emissions were associated with soil carbon sequestration. Meanwhile, the Proteobacteria is involved in soil carbon sequestration and CO2 production. These results suggest that anaerobic microorganisms exhibit high efficiency in accelerating straw degradation rates and enhancing soil carbon content following a 6-hour pretreatment of straw. The capacity of anaerobic microorganisms to convert solid waste has been shown, and highlights their robust potential for agricultural waste management and carbon sequestration.
期刊介绍:
Environmental Technology & Innovation adopts a challenge-oriented approach to solutions by integrating natural sciences to promote a sustainable future. The journal aims to foster the creation and development of innovative products, technologies, and ideas that enhance the environment, with impacts across soil, air, water, and food in rural and urban areas.
As a platform for disseminating scientific evidence for environmental protection and sustainable development, the journal emphasizes fundamental science, methodologies, tools, techniques, and policy considerations. It emphasizes the importance of science and technology in environmental benefits, including smarter, cleaner technologies for environmental protection, more efficient resource processing methods, and the evidence supporting their effectiveness.