Changes in labile soil organic carbon fractions in wetland ecosystems along a latitudinal gradient in Northeast China

Auteur(s) et Affiliation(s)



Description :
Topsoil (0–20 cm) was collected from 5 wetlands along a latitudinal gradient in Northeast China. The AA. analyzed soil organic carbon (SOC) and some labile fractions. Their results demonstrated that wetland SOC and its labile fractions concentration declined with decreasing latitude. The Permafrost regions had greater organic carbon content than the regions with seasonally frozen ground. Microbial biomass carbon and dissolved organic carbon showed a similar decreasing trend to that of SOC. At the same latitude, vegetation affected SOC stock and the dynamics of its labile fractions. Therefore, wetlands in mid-high latitudes contain a large carbon pool, and carbon stock varies with latitude. Although the labile fractions were higher in the permafrost region, their activities were lower, due to low temperature and poor nutrient status. Under global warming, the labile carbon pool may be mobilized and contribute to the greenhouse effect. Moreover, vegetation differences should be considered in obtaining an accurate carbon calculation.


Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2012, vol. 96, p. 83-89, nombre de pages : 7, Références bibliographiques : 50 ref.

Date :
2012

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena