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Warming and increased precipitation frequency on the Colorado Plateau: Implications for biological soil crusts and soil processes

Plant and Soil

By:
, , , ,
DOI: 10.1007/s11104-011-1097-z

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Abstract

Aims Changes in temperature and precipitation are expected to influence ecosystem processes worldwide. Despite their globally large extent, few studies to date have examined the effects of climate change in desert ecosystems, where biological soil crusts are key nutrient cycling components. The goal of this work was to assess how increased temperature and frequency of summertime precipitation affect the contributions of crust organisms to soil processes. Methods With a combination of experimental 2°C warming and altered summer precipitation frequency applied over 2 years, we measured soil nutrient cycling and the structure and function of crust communities. Results We saw no change in crust cover, composition, or other measures of crust function in response to 2°C warming and no effects on any measure of soil chemistry. In contrast, crust cover and function responded to increased frequency of summer precipitation, shifting from moss to cyanobacteria-dominated crusts; however, in the short timeframe we measured, there was no accompanying change in soil chemistry. Total bacterial and fungal biomass was also reduced in watered plots, while the activity of two enzymes increased, indicating a functional change in the microbial community. Conclusions Taken together, our results highlight the limited effects of warming alone on biological soil crust communities and soil chemistry, but demonstrate the substantially larger effects of altered summertime precipitation.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Warming and increased precipitation frequency on the Colorado Plateau: Implications for biological soil crusts and soil processes
Series title:
Plant and Soil
DOI:
10.1007/s11104-011-1097-z
Volume
355
Issue:
1-2
Year Published:
2012
Language:
English
Publisher:
Springer
Publisher location:
http://www.springer.com
Contributing office(s):
Southwest Biological Science Center
Description:
18 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
265
Last page:
282
Number of Pages:
18
Country:
United States