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(Article of periodic en Anglais - 2013)

Document title

Response of cyanobacterial soil crusts to moisture and nutrient availability

Authors(s) and Affiliation(s)

STRONG C.L. (1) ; BULLARD J.E. (2) ; BURFORD M.A. (3) ; MCTAINSH G.H. (1) ;
(1) Atmospheric Environment Research Centre, The Griffith School of Environment, Griffith Univ., Queensland, Brisbane, AUSTRALIE
(2) Dept. of geography, Univ., Loughborough, ROYAUME-UNI
(3) Australian Rivers Inst., Griffith University, Brisbane, AUSTRALIE

Abstract

This paper presents a series of laboratory experiments which determine cyanobacterial soil crust response to moisture and nutrient availability. Photosynthetic yield measurements indicate a rapid response in cyanobacterial response following hydration and suggest moisture content > 14% is necessary to sustain such activity. The addition of nutrients did not trigger any significant increase in crust metabolic activity or photosynthetic response compared with deionised water over a 7-day period. However, over longer periods (> 4 weeks) nutrient-enriched rainfall promoted an increase in cyanobacterial metabolic growth measures (chlorophyll a and "greenness") compared with deionised water. The results show that the magnitude and frequency of hydration from rainfall and flood events in arid regions play an important role in the maintenance of cyanobacterial soil crusts. Predicted changes in dryland hydrological regimes in the Australian arid zone as a consequence of climate shifts, may therefore have an impact on the ability of cyanobacterial crusts to promote landscape stability

Source

Article of periodic

published at : Catena / ISSN 0341-8162

Editor : Catena, Cremlingen-Destedt - ALLEMAGNE (1973)

Millesime : 2013, vol. 109 [pp. 195-202]

Bibliographic references : 1 p.

Collation : 4 fig.

Language

Anglais

INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2013.03.016

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
Refdoc record number (ud4) : 27740386 : Permanent link - XML version
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