NDLI: Regulation of Microbial Community Composition and Activity by Soil Nutrient Availability, Soil pH, and Herbivory in the Tundra

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Regulation of Microbial Community Composition and Activity by Soil Nutrient Availability, Soil pH, and Herbivory in the Tundra

Content Provider	Springer Nature Link
Author	Stark, Sari Eskelinen, Anu Männistö, Minna K.
Copyright Year	2011
Abstract	Soil nitrogen (N) availability and pH constitute major abiotic controls over microbial community composition and activity in tundra ecosystems. On the other hand, mammalian grazers form an important biotic factor influencing resource coupling between plants and soil microorganisms. To investigate individual effects and interactions among soil nutrients, pH, and grazing on tundra soils, we performed factorial treatments of fertilization, liming, and grazer exclusion in the field for 3 years at 2 contrasting tundra habitats, acidic (N-poor) and non-acidic (N-rich) tundra heaths. The effects of all treatments were small in the non-acidic tundra heaths. In the acidic tundra heaths, fertilization decreased the fungal:bacterial ratio as analyzed by soil PLFAs, but there were no effects of liming. Fertilization increased soil N concentrations more drastically in ungrazed than grazed plots, and in parallel, fertilization decreased the fungal:bacterial ratio to a greater extent in the ungrazed plots. Liming, on the other hand, partly negated the effects of fertilization on both soil N concentrations and PLFAs. Fertilization drastically increased the activity of phenol oxidase, a microbial enzyme synthesized for degradation of soil phenols, in grazed plots, but had no effect in ungrazed plots. Taken together, our results demonstrate that grazers have the potential to regulate the fungal:bacterial ratio in soils through influencing N availability for the soil microorganisms.
Starting Page	18
Ending Page	33
Page Count	16
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	15
Issue Number	1
e-ISSN	14350629
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-09-27
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	enzyme activity herbivory nitrogen PLFAs phenol oxidase pH soil organic matter quality tundra Environmental Management Ecology Nature Conservation Zoology Plant Sciences Geoecology/Natural Processes
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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