Abstract：
:Terrestrial ecosystems, both natural ecosystems and agroecosystems, generate greenhouse gases (GHGs). The chamber method is the most common method to quantify GHG fluxes from soil-plant systems and to better understand factors affecting their generation and mitigation. The objective of this study was to review and synthesize literature on chamber designs (non-flow-through, non-steady-state chamber) and associated factors that affect GHG nitrous oxide (N2 O) flux measurement when using chamber methods. Chamber design requires consideration of many facets that include materials, insulation, sealing, venting, depth of placement, and the need to maintain plant growth and activity. Final designs should be tailored, and bench tested, in order to meet the nuances of the experimental objectives and the ecosystem under study while reducing potential artifacts. Good insulation, to prevent temperature fluctuations and pressure changes, and a high-quality seal between base and chamber are essential. Elimination of pressure differentials between headspace and atmosphere through venting should be performed, and designs now exist to eliminate Venturi effects of earlier tube-type vent designs. The use of fans within the chamber headspace increases measurement precision but may alter the flux. To establish best practice recommendations when using fans, further data are required, particularly in systems containing tall plants, to systematically evaluate the effects that fan speed, position, and mixing rate have on soil gas flux.
journal_name
J Environ Qualjournal_title
Journal of environmental qualityauthors
Clough TJ,Rochette P,Thomas SM,Pihlatie M,Christiansen JR,Thorman REdoi
10.1002/jeq2.20117subject
Has Abstractpub_date
2020-09-01 00:00:00pages
1081-1091issue
5eissn
0047-2425issn
1537-2537journal_volume
49pub_type
杂志文章abstract：:Corn stover harvesting is a common practice in the western U.S. Corn Belt. This 5-yr study used isotopic source tracking to quantify the influence of two tillage systems, two corn ( L.) surface residue removal rates, and two yield zones on soil organic C (SOC) gains and losses at three soil depths. Soil samples collec...
journal_title：Journal of environmental quality
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doi：10.2134/jeq2007.0332
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pub_type： 杂志文章
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pub_type： 杂志文章
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journal_title：Journal of environmental quality
pub_type： 杂志文章
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更新日期：2011-11-01 00:00:00
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pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：2015-11-01 00:00:00
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abstract：:Land application of manure can exacerbate nutrient and contaminant transfers to the aquatic environment. This study examined the effect of injecting a dairy cattle (Bostaurus L.) manure slurry on mobilization and leaching of dissolved, nonreactive slurry components across a range of agricultural soils. We compared lea...
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