【摘要】 在全球气候变化背景下温室气体减排已成为当前研究热点之一。该研究通过研究含水率和C/N耦合对驴粪堆肥过程中的温室气体排放和全球增温潜势的影响,从中筛选出温室气体减排的含水率和C/N耦合模式,为实现堆肥过程中温室气体减排提供依据和参考。以驴粪堆肥为对象,采用静态箱-气相色谱法研究了不同C/N和含水率耦合,即W₁R₁（含水率:55%;C/N:25-1）、W₁R₂（含水率:55%;C/N:30-1）、W₁R₃（含水率:55%;C/N:35-1）、W₂R₁（含水率:60%;C/N:25-1）、W₂R₁（含水率:60%;C/N:30-1）、W₂R₃（含水率:60%;C/N:35-1）6种驴粪堆肥模式对温室气体排放和全球增温潜势的影响。结果表明,在堆肥过程中,堆温呈先升后降趋势,含氧量呈先降后升趋势,堆温和含氧量呈极显著负相关关系;低C/N、低含水率有利于堆温的升高。N₂O、CH₄、CO₂排放通量总体呈先升后降趋势,排放峰值分别出现在堆肥后24、8、16 d左右。6种堆肥模式下CH4、CO₂排放通量与堆温呈极显著正相关,CH4排放通量与含氧量呈极显著负相关。全球增温潜势大小顺序为W₂R₁>W₂R₃>W₁R₂>W₁R₁>W₂R₂>W₁R₃。各处理均以CO₂累积排放量对全球增温潜势贡献最大,达到66.30%以上,N₂O贡献为2.07%-32.45%,CH4贡献低于1.54%。综合考虑堆温和全球增温效应,建议采用W₁R₃堆肥模式。更多还原

【Abstract】 Greenhouse gas emission reduction has been one of the research hotspots under the context of global climate change. The effects of moisture content and C/N coupling mode on reducing greenhouse gas emission and global warming potential（GWP） were studied in this paper., so as to find the suitable moisture content and C/N coupling mode for reducing greenhouse gas emission, and provide the references or reasons for greenhouse gas emission reduction in manure composting. The six donkey manure composting treatments, such as W₁R₁（water content: 55%; C/N: 25-1）, W₁ R₂（water content: 55%; C/N: 30-1）, W₁ R₃（water content: 55%; C/N:35-1）, W₂ R₁（water content: 60%; C/N: 25-1）, W₂ R₁（water content: 60%; C/N: 30-1） and W₂ R₃（water content: 60%; C/N: 35-1）were set to research greenhouse gas emissions and global warming potential by using the static chamber-gas chromatography. The results showed that the manure temperature increased in the early stage and decreased in the mid and later stage, but the opposite trend happened to the oxygen content, so the manure temperature and oxygen content showed a significantly negative correlationship. Lower C/N ratio and water content were conducive to the manure temperature increasing. The N₂ O, CH₄, and CO₂ emission fluxes mainly increased in early period and decreased in mid and later stage, and the biggest emission fluxes of N₂ O, CH₄,and CO₂ appeared around 24 d, 8 d and 16 d after manure composting, respectively. The CH4 and CO₂ emission fluxes positively correlated with the manure temperature among the six composting modes, but the significantly negative relationship happened to CH4 emission flux with the manure oxygen content. GWP decreased in sequence of W₂ R₁>W₂ R₃>W₁ R₂>W₁ R₁>W₂ R₂>W₁ R₃. The cumulative CO₂ emission amount of each treatment made the greatest contribution to GWP, the contribution proportion was more than 66.30%, N₂ O contribution proportion varied from 2.07% to 32.45%, and CH₄ contribution proportion was less than 1.54%.Considering the manure composting temperature and global warming effect, the W₁R₃ composting mode should be recommended.更多还原