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(Article of periodic en Anglais - 2014)

Document title

Mineralisation and changes in the fractions of soil organic matter in soils of the permafrost region, Qinghai-Tibet Plateau, China

Authors(s) and Affiliation(s)

WU X. (1) ; FANG H. (1 2) ; ZHAO L. (1) ; WU T. (1) ; LI R. (1) ; REN Z. (1) ; PANG Q. (1) ; DING Y. (1) ;
(1) Cryosphere Research station on the Qinghai-Tibet Plateau, Key Lab. of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Inst., Chinese Academy of Sciences, Lanzhou, CHINE
(2) Graduate Univ. of Chinese Academy of Sciences, Beijing, CHINE

Abstract

To determine the relationship between soil organic matter (SOM) decomposition and chemistry in the permafrost region of the Qinghai-Tibet Plateau (QTP), 300-day laboratory incubations at 25°C and chemical fractionation were performed to characterise the mineralisation dynamics of organic carbon from soils under 5 vegetation conditions. The respiration rates in wet meadows were the highest. After the incubation period, all 4 fractions of SOM (non-polarity soluble, water soluble, holocellulose and lignin contents) showed some decline, and the SOM decreased by 16–20 per cent in soils of the steppe, meadow and wet meadow. These results suggest that a large proportion of the organic matter in soils of the permafrost region in the QTP is mineralisable. Based on the changes in chemical fractions of organic matter, it could be determined that soils with higher water-soluble fractions had higher rates of carbon mineralisation, while the mechanisms involved in the respiration of different chemical fractions are complicated

Source

Article of periodic

published at : Permafrost and periglacial processes / ISSN 1045-6740 / CODEN PEPPED

Editor : Wiley, Chichester - ROYAUME-UNI (1990)

Millesime : 2014, vol. 25, no1 [pp. 35-44]

Bibliographic references : 2 p.

Collation : 6 fig., 3 tabl.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.1796

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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