Arid
DOI10.1002/ecs2.2745
Thermal abiotic emission of CO2 and CH4 from leaf litter and its significance in a photodegradation assessment
Day, Thomas A.1; Bliss, Michael S.1; Placek, Sarah K.1; Tomes, Alexander R.1; Guenon, Rene1,2
通讯作者Day, Thomas A.
来源期刊ECOSPHERE
ISSN2150-8925
出版年2019
卷号10期号:5
英文摘要Photodegradation has been recognized as a significant driver of plant litter decomposition in drylands. Another potential driver is the thermal emission of trace gases that occurs in the absence of solar radiation and microbial activity. Most field assessments documenting photodegradation have employed filters that absorb solar radiation, along with transparent filter controls; faster litter decay under transparent filters is taken as evidence of photodegradation. However, the temperature of litter under transparent filters is often higher, and its faster decay might conceivably stem from greater thermal emission, rather than photodegradation. If true, the growing consensus that photodegradation is a significant driver of litter decay needs rethinking. We assessed the contribution of thermal emission of CO2 and CH4 to the C loss of 12 litter types over a 34-month photodegradation study in the Sonoran Desert by quantifying thermal emission responses and using field litter temperatures to estimate emissions. Emission of both gases from litter increased exponentially with temperature. Emission of CO2 was much greater than CH4, but their rates were strongly correlated. Concentrations of surface waxes and dissolved organic C in litter were strong predictors of emission of both gases. Emission declined from dried green leaves to naturally senesced litter, and as litter decayed. Diurnal litter temperature averaged 39.8 degrees C under transparent filters over the field experiment and averaged 1.7 degrees C higher than that of litter under filters that absorbed UV through blue solar wavelengths. Through all mechanisms, litter lost an average of 77.8% of its original C under transparent filters and 60.8% under filters that absorbed UV through blue wavelengths. However, thermal emission of these gases accounted for only 0.8% of the original C in litter under transparent filters and 1.0% under filters that absorbed UV through blue wavelengths, corresponding to only 1.2% and 2.0% of the total C lost from litter. While litter temperatures were higher under transparent filters, thermal emission losses from this litter were lower because emission from this litter declined faster with decay. We conclude that thermal abiotic emission was a minor C loss pathway and that photodegradation was responsible for the faster decay of litter in sunlight.
英文关键词carbon dioxide drylands litter decomposition methane photodecay photodegradation Sonoran Desert temperature thermal degradation thermal emission wax
类型Article
语种英语
国家USA ; France
开放获取类型Green Published, gold
收录类别SCI-E
WOS记录号WOS:000474063600006
WOS关键词AEROBIC METHANE RELEASE ; UV-B RADIATION ; PLANT LITTER ; ULTRAVIOLET-RADIATION ; CARBON-MONOXIDE ; LIGNIN CONTROL ; DECOMPOSITION ; NITROGEN ; DEGRADATION ; TEMPERATURE
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构Arizona State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/215309
作者单位1.Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA;
2.Agrocampus Ouest, EPHOR, F-49045 Angers, France
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GB/T 7714
Day, Thomas A.,Bliss, Michael S.,Placek, Sarah K.,et al. Thermal abiotic emission of CO2 and CH4 from leaf litter and its significance in a photodegradation assessment[J]. Arizona State University,2019,10(5).
APA Day, Thomas A.,Bliss, Michael S.,Placek, Sarah K.,Tomes, Alexander R.,&Guenon, Rene.(2019).Thermal abiotic emission of CO2 and CH4 from leaf litter and its significance in a photodegradation assessment.ECOSPHERE,10(5).
MLA Day, Thomas A.,et al."Thermal abiotic emission of CO2 and CH4 from leaf litter and its significance in a photodegradation assessment".ECOSPHERE 10.5(2019).
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