TITLE

Carbon and mass balance in a south Swedish ombrotrophic bog: processes and variation during recent centuries

AUTHOR(S)
Malmer, N.; Svensson, G.; Wallén, B.
PUB. DATE
January 2011
SOURCE
Mires & Peat;2011, Vol. 8, p1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This study, performed in 1982-2007, deals with the processes in the acrotelm and the subsequent addition (accretion) of material to the catotelm of an ombrotrophic bog in southern Sweden. It is based on analyses of C and N in biomass, necromass and mire water combined with age determinations by 210Pbx. The C input to the acrotelm was 102 g m-2 a-1 of which 69% was released through decay and the rest either retained as peat or exported as dissolved organic matter (DOM). The mean C accretion to the catotelm was 20-25% lower in 1900-1980 than in 1800-1900 due to the rising bog surface, continuously increasing acrotelm thickness and total decay loss. Annual runoff, determined indirectly from [Na+] in precipitation and drainage water, varied more (range 200-770 mm) than the concentration of dissolved organic C (DOC; range 25-55 mg L-1) and mainly determined DOC export. During 1993-2007, with high precipitation (mean 880 mm a-1) and mild winters, the mean DOC export and C accretion to the catotelm were equal at 16 g m-2 a-1. During 1953-1960, with lower precipitation (∼700 mm a-1) and "normal" winters, the DOC export and C accretion were probably about 9 and 23 g m-2, respectively. The release of C to the atmosphere downstream from the bog was correspondingly lower. As a C sink, the bog at present may be half as efficient as it was 50-200 years ago. The DOC exported was accompanied by 25-50% of the N input in litter.
ACCESSION #
91956989

 

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