Találati lista | Tudóstér

001-es BibID:	BIBFORM079812
Első szerző:	Spohn, Marie
Cím:	Changes in soil organic matter quality during sea-influenced marsh soil development at the North Sea coast / Marie Spohn, Beáta Babka, Luise Giani
Dátum:	2013
ISSN:	0341-8162
Megjegyzések:	Salt marsh soils sequester large amounts of organic matter (OM). The question we address in this study is how OM quality changes during initial soil development in salt marshes. To answer this question, we studied soils at six sites at the German North Sea coast. At each site, three zones ? low, mid, and high marsh ? that differ in inundation frequency were analyzed. We found that organic carbon (OC) and nitrogen (N) contents increased significantly with decreasing inundation frequency at all sites, while inorganic carbon contents decreased. ?13C signatures of the OC strongly decreased at all sites from low to highmarsh (from?15.3 to?21.5?), indicating a decrease in the proportion of marine-derived OC. The decrease in sea-derived OC was associated with an increase in C/N ratio, which can be attributed to the difference in the C/N ratios between sea- and land-derived OM inputs. Increases in OC and N contents in the bulk soils during soil development resulted from increases of the OC content in the coarse size fraction (>200 ?m), and were associated with increases in the content of hot water extractable C and N (Chwe and Nhwe). The proportion of OM found in the fraction <2 ?m decreased with soil development. The ?13C signature of the OC sequestered in this fraction decreased from ?20.6 to ?24.0?. The smaller decrease in the ?13C signatures of the OC in the fraction <2 ?m compared to the ?13C signatures of the OC in the bulk soils indicates that the OC is relatively rigidly bound to the minerals in this fraction. The low ?13C signatures of OC stored in the fraction <2 ?m indicates that OM in this fraction is mainly of terrestrial origin. In conclusion, this study shows that OM contents and the proportion of relatively labile OM increases during initial marsh soil development due to inputs of terrestrial OC.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban Salt marsh Initial soil development Organic matter Coastal wetland Terrestrial and marine organic carbon Carbon sequestration
Megjelenés:	Catena. - 107 (2013), p. 110-117. -
További szerzők:	Babka Beáta (1984-) (környezetkutató) Giani, Luise
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: