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| Titel |
Depth Effects on Plant Residue Decay in Diverse Soils |
| VerfasserIn |
Edward Gregorich, Benjamin Ellert, Henry Janzen, Bobbi Helgason, Michael Beare, Denis Curtin |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250152868
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| Publikation (Nr.) |
 EGU/EGU2017-17768.pdf |
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| Zusammenfassung |
| Decay of plant residues is tied to many ecosystem functions, affecting atmospheric CO2,
plant-available nutrients, microbial diversity, soil organic matter quality, among others. The
rate of decay, in turn, is governed by soil type and management, location in the soil profile,
and environmental variables, some of which may be changing in coming decades. Our
objective in this study was to elucidate the decomposition dynamics of plant-derived C and N
at different soil depths. To describe mathematically the importance of these variables across a
broad scale, we established a long-term study at two sites in Canada and one site in New
Zealand. At each site, labelled barley straw (13C = 10.2 atom%, 15N = 8.3 atom %; C =
37.9%; N = 0.95%; C:N = 40) was installed at 3 depths (5-10, 20-25 and 40-45 cm). Soil
temperature was logged at each depth. Samples were collected at different times over 5-6
year after application of the residues. Data on recovery and kinetics of residue C and
N over the experimental period will be discussed as well as 13C- PLFA results. |
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