利用微气象物质平衡和流量室测量绿色废弃物堆肥温室气体通量

IF 2 4区 农林科学 Q3 ECOLOGY Compost Science & Utilization Pub Date : 2019-04-03 DOI:10.1080/1065657X.2019.1571462
E. Kent, S. K. Bailey, J. Stephens, W. Horwath, K. Paw U
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引用次数: 2

摘要

温室气体(ghg)是在堆肥过程中产生的,但很少有研究从一个全面的绿色废物堆肥窗口测量排放。这对于评估堆肥作为一种废物管理选择以及了解改变目前的堆肥管理实践如何有助于减少排放非常重要。本研究使用微气象质量平衡(MMB)和开放式流室技术来测量北加州绿色废物堆肥窗口中的二氧化碳(CO2)、甲烷(CH4)和一氧化二氮(N2O)的排放。MMB技术在研究期间产生了平均逆风-顺风浓度差异,显示了所有三种温室气体的来源。CO2比CH4和N2O表现出更强的信号。在较低水平和较低通量的CO2浓度差异中发现了强烈的日变化模式,大量噪声可能掩盖了CH4和N2O的任何可能的日变化模式。自上次转折事件发生以来,按时间归一化的通量显示,CO2浓度差(较低水平)和通量最初迅速上升,在转折事件发生后近13 h达到峰值,随后逐渐下降。其他两种气体的相同模式不太清楚,但自上次转折事件以来,随着时间的增加,浓度差和通量的总体下降很明显。由于技术和采样频率的差异,MMB和腔室计算的通量存在很大差异。
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Measurements of Greenhouse Gas Flux from Composting Green-Waste Using Micrometeorological Mass Balance and Flow-Through Chambers
Abstract Greenhouse gases (GHGs) are produced during the composting process, but few studies have measured emissions from a full-scale windrow of composting green-waste. This is important for evaluating composting as a waste management option and for understanding how changes to current composting management practices could help reduce emissions. This study uses micrometeorological mass balance (MMB) and open flow-through chamber techniques to measure emissions of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) from a windrow of composting green-waste in Northern California. The MMB technique yielded mean upwind–downwind concentration differences over the study period that showed sourcing of all three GHGs. CO2 showed a stronger signal than CH4 and N2O. A strong diel pattern was found in the concentration differences at lower levels and fluxes of CO2, with substantial noise likely obscuring any possible daily patterns for CH4 and N2O. Fluxes normalized by the time since the previous turn event revealed an initial rapid rise in CO2 concentration differences (at lower levels) and fluxes, peaking close to 13 h after the turn event followed by a gradual decline. The same pattern was not as clear for the other two gases but overall declines in concentration differences and fluxes were apparent with increasing time since the previous turn event. Substantial differences between MMB and chamber calculated fluxes were found, due to both differences in the techniques as well as sampling frequency.
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来源期刊
Compost Science & Utilization
Compost Science & Utilization 农林科学-生态学
CiteScore
4.10
自引率
0.00%
发文量
0
审稿时长
>36 weeks
期刊介绍: 4 issues per year Compost Science & Utilization is currently abstracted/indexed in: CABI Agriculture & Environment Abstracts, CSA Biotechnology and Environmental Engineering Abstracts, EBSCOhost Abstracts, Elsevier Compendex and GEOBASE Abstracts, PubMed, ProQuest Science Abstracts, and Thomson Reuters Biological Abstracts and Science Citation Index
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