Microbial dynamics and carbon and nitrogen cycling following re-wetting of soils beneath two semi-arid plant species

Oecologia
Peter Saetre, John M Stark

Abstract

Sporadic summer rainfall in semi-arid ecosystems can provide enough soil moisture to drastically increase CO(2) efflux and rates of soil N cycling. The magnitudes of C and N pulses are highly variable, however, and the factors regulating these pulses are poorly understood. We examined changes in soil respiration, bacterial, fungal and microfaunal populations, and gross rates of N mineralization, nitrification, and NH(4) (+) and NO(3) (-) immobilization during the 10 days following wetting of dry soils collected from stands of big sagebrush (Artemisia tridentata) and cheatgrass (Bromus tectorum) in central Utah. Soil CO(2) production increased more than tenfold during the 17 h immediately following wetting. The labile organic C pool released by wetting was almost completely respired within 2-3 days, and was nearly three times as large in sagebrush soil as in cheatgrass. In spite of larger labile C pools beneath sagebrush, microbial and microfaunal populations were nearly equal in the two soils. Bacterial and fungal growth coincided with depletion of labile C, and populations peaked in both soils 2 days after wetting. Protozoan populations, whose biomass was nearly 3,000-fold lower than bacteria and fungi, peaked after 2-4 days. ...Continue Reading

References

Apr 1, 1983·Applied and Environmental Microbiology·L R Bakken, R A Olsen
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Citations

Jun 21, 2012·Proceedings of the National Academy of Sciences of the United States of America·Sarah A PlacellaMary K Firestone
Mar 26, 2013·Applied and Environmental Microbiology·Sarah A Placella, Mary K Firestone
Jan 20, 2009·Applied and Environmental Microbiology·Johannes RouskErland Bååth
May 5, 2010·Ecological Applications : a Publication of the Ecological Society of America·S G Yelenik, J M Levine
Mar 15, 2011·Trends in Ecology & Evolution·Amy T Austin
Mar 2, 2016·The Science of the Total Environment·Miriam Muñoz-RojasDavid J Merritt
Feb 18, 2015·Frontiers in Microbiology·Zachary T AanderudJay T Lennon
Jun 13, 2008·FEMS Microbiology Ecology·Paola Iovieno, Erland Bååth
Nov 10, 2007·FEMS Microbiology Ecology·Johannes Rousk, Erland Bååth
Apr 19, 2007·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Jesper LuxhøiThomas Larsen
Jan 4, 2006·Microbial Ecology·Martina StursovaRobert L Sinsabaugh
Jul 21, 2017·Journal of Environmental Quality·Mitchell A Pavao-Zuckerman, Christine Sookhdeo
Apr 4, 2021·The Science of the Total Environment·Adugna FeyissaXiaoli Cheng

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