Partitioning soil respiration: quantifying the artifacts of the trenching method
作者:K. E. Savage . E. A. Davidson . R. Z. Abramoff . A. C. Finzi . M.-A. Giasson
摘要:Total soil respiration (Rt) is a combination
of autotrophic (Ra) and heterotrophic respiration (Rh).
Root exclusion methods, such as soil trenching, are
often utilized to separate these components. This
method involves severing the rooting system surrounding a plot to remove the Ra component. However, soil trenching has potential limitations including
(1) reduced water uptake in trenched plots that
increases soil water content, which is one of the
environmental controllers of Rt in many ecosystems,
and (2) increased available carbon substrate for Rh
caused by recently severed dead roots. We present a
methodology that utilizes a bayesian modeling framework to quantify the magnitude of artifacts from a
large trenching manipulation experiment. Thus
methodology corrects Rh and Ra observations at daily
to seasonal time scales. This study finds that the
artifacts, due to recently severed roots, persist over a
2 years study period and the artifacts due to altered
soil moisture had the greatest impact during drought
conditions.
关键词:Autotrophic respiration Bayesian modeling Heterotrophic respiration Trenching
论文方向:[{"id":852,"name":"林学"}]
发表期刊:
数字识别码:10.1007/s10533-018-0472-8
是否作者本人: 否
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