DOI: 10.1007/s10533-013-9851-3
Scopus记录号: 2-s2.0-84884132972
论文题名: Micro-scale modeling of pesticide degradation coupled to carbon turnover in the detritusphere: Model description and sensitivity analysis
作者: Pagel H. ; Ingwersen J. ; Poll C. ; Kandeler E. ; Streck T.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 117, 期: 1 起始页码: 185
结束页码: 204
语种: 英语
英文关键词: Biogeochemical interface
; Carbon isotopes
; Gene abundance
; Mechanistic model
; Priming effect
; Soil organic matter
Scopus关键词: bacterium
; biogeochemistry
; carbon cycle
; carbon isotope
; degradation
; detritus
; fungus
; microbial community
; organic carbon
; pesticide
; sensitivity analysis
; soil organic matter
; sorption
; turnover
英文摘要: Microbiologically active biogeochemical interfaces are excellent systems to study soil functions such as pesticide degradation at the micro-scale. In particular, in the detritusphere pesticide degradation is accelerated by input of fresh organic carbon from litter into the adjacent soil. This observed priming effect suggests: (i) pesticide degradation is strongly coupled to carbon turnover, (ii) it is controlled by size and activity of the microbial community and (iii) sorption and transport of dissolved carbonaceous compounds and pesticides might regulate substrate availability and in turn decomposition processes. We present a new mechanistic 1D model (PEsticide degradation Coupled to CArbon turnover in the Detritusphere, PECCAD) which implements these hypotheses. The new model explicitly considers growth and activity of bacteria, fungi and specific pesticide degraders in response to substrate availability. Enhanced pesticide degradation due to availability of a second source of carbon (dissolved organic carbon) is implemented in the model structure via two mechanisms. First, additional substrate is utilized simultaneously with the pesticide by bacterial pesticide degraders resulting in an increase in their size and activity. Second, stimulation of fungal growth and activity by additional substrates leads directly to higher pesticide degradation via co-metabolism. Thus, PECCAD implicitly accounts for litter-stimulated production and activity of unspecific fungal enzymes responsible for co-metabolic pesticide degradation. With a global sensitivity analysis we identified high-leverage model parameters and input. In combination with appropriate experimental data, PECCAD can serve as a tool to elucidate regulation mechanisms of accelerated pesticide degradation in the detritusphere. © 2013 Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83637
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Institute of Soil Science and Land Evaluation, Biogeophysics, University of Hohenheim, Emil-Wolff-Str. 27, 70593 Stuttgart, Germany; Institute of Soil Science and Land Evaluation, Soil Biology, University of Hohenheim, 70593 Stuttgart, Germany
Recommended Citation:
Pagel H.,Ingwersen J.,Poll C.,et al. Micro-scale modeling of pesticide degradation coupled to carbon turnover in the detritusphere: Model description and sensitivity analysis[J]. Biogeochemistry,2014-01-01,117(1)