 |
| Titel |
Black Carbon - Soil Organic Matter abiotic and biotic interactions |
| VerfasserIn |
Francesca Cotrufo, Claudia Boot, Karolien Denef, Erika Foster, Michelle Haddix, Xinyu Jiang, Jennifer Soong, Catherine Stewart |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094078
|
| Publikation (Nr.) |
 EGU/EGU2014-9419.pdf |
|
|
|
|
|
| Zusammenfassung |
| Wildfires, prescribed burns and the use of char as a soil amendment all add large
quantities of black carbon to soils, with profound, yet poorly understood, effects on soil
biology and chemical-physical structure. We will present results emerging from our
black carbon program, which addresses questions concerning: 1) black carbon-soil
organic matter interactions, 2) char decomposition and 3) impacts on microbial
community structure and activities. Our understanding derives from a complementary set
of post-fire black carbon field surveys and laboratory and field experiments with
grass and wood char amendments, in which we used molecular (i.e., BPCA, PLFA)
and isotopic (i.e., 13C and 15N labelled char) tracers. Overall, emerging results
demonstrate that char additions to soil are prone to fast erosion, but a fraction remains that
increases water retention and creates a better environment for the microbial community,
particularly favoring gram negative bacteria. However, microbial decomposition of black
carbon only slowly consumes a small fraction of it, thus char still significantly
contributes to soil carbon sequestration. This is especially true in soils with little
organic matter, where black carbon additions may even induce negative priming. |
|
|
|
|
|
|