How does the chemical composition of dung affect nitrous oxide and methane emissions in pasture soils?

IF 8 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Journal of Environmental Management Pub Date : 2025-01-01 Epub Date: 2024-12-09 DOI:10.1016/j.jenvman.2024.123630
Francisco Paulo Amaral Júnior, Camila Eduarda Souza de Sousa, Bruno Rafael de Almeida Moreira, Bruno José Rodrigues Alves, Vanessa Zirondi Longhini, Abmael da Silva Cardoso, Ana Cláudia Ruggieri
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引用次数: 0

Abstract

There is an important gap in how variations in herbivore dung composition affect GHG emissions on pastures, especially due to differences in dry matter (DM) and nitrogen contents. Oversimplifications can compromise the accuracy of mitigation strategies. This study aims to address this gap by investigating how the chemical composition of dung from different species influences GHG emissions in pasture systems. The results showed that drier dung led to higher cumulative N₂O emissions. The highest emissions were observed from goat at 9.47 mg N-N₂O g⁻1 dry soil, followed by sheep at 5.95 mg N-N₂O g⁻1 dry soil, beef cattle at 5.44 mg N₂O g⁻1 dry soil, dairy cattle at 2.67 mg N₂O g⁻1 dry soil, and horse at 0.83 mg N₂O g⁻1 dry soil. It was observed that higher dung moisture content generally corresponded to increased CH₄ emissions, except for horse dung. The highest cumulative CH₄ emission was for dairy cattle dung (8.29 mg C-CH₄ g⁻1 dry soil), followed by beef cattle (3.89 mg C-CH₄ g⁻1 dry soil), sheep (2.32 mg C-CH₄ g⁻1 dry soil), goats (1.89 mg C-CH₄ g⁻1 dry soil), and horses (1.66 mg C-CH₄ g⁻1 dry soil). Principal Component Analysis illustrated that PC1, named as diet quality, explained 61.9% of the variance, was positively correlated with N₂O and negatively correlated with fiber content and C/N ratio, while PC2, named as acetrophic and hydrogenotrophic methanogenesis, explained 19.6% of the variance, linking VS to reduced CH₄ emissions. This study establishes relationships between manure chemical composition and GHG emissions, filling a fundamental knowledge gap and supporting the development of cause-and-effect models.

粪便的化学成分如何影响牧场土壤中氧化亚氮和甲烷的排放?
草食动物粪便组成的变化如何影响牧场温室气体排放,特别是由于干物质(DM)和氮含量的差异,目前还存在一个重要的空白。过度简化会损害缓解策略的准确性。本研究旨在通过调查不同物种粪便的化学成分如何影响牧场系统的温室气体排放来解决这一差距。结果表明,粪越干,累积的N₂O排放量越高。山羊的排放量最高,为9.47毫克N-N₂O g毒血症干土,其次是绵羊5.95毫克N-N₂O g毒血症干土,肉牛5.44毫克N₂O g毒血症干土,奶牛2.67毫克N₂O g毒血症干土,马0.83毫克N₂O g毒血症干土。除马粪外,粪中水分含量越高,一般越能增加硫酸铵的排放量。累积释放最多的是牛粪(8.29 mg C-CH₄g⁻干土),其次是肉牛(3.89 mg C-CH₄g⁻干土)、绵羊(2.32 mg C-CH₄g⁻干土)、山羊(1.89 mg C-CH₄g⁻干土)和马(1.66 mg C-CH₄g⁻干土)。主成分分析表明,PC1(膳食质量)与N₂O呈正相关,与纤维含量和C/N负相关,解释方差的61.9%;PC2(乙酰营养化和氢营养化产甲烷作用)解释方差的19.6%,将VS与减少的CH _4排放联系起来。本研究建立了粪便化学成分与温室气体排放之间的关系,填补了基础知识空白,并支持因果模型的发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Environmental Management
Journal of Environmental Management 环境科学-环境科学
CiteScore
13.70
自引率
5.70%
发文量
2477
审稿时长
84 days
期刊介绍: The Journal of Environmental Management is a journal for the publication of peer reviewed, original research for all aspects of management and the managed use of the environment, both natural and man-made.Critical review articles are also welcome; submission of these is strongly encouraged.
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