NDLI: Biodiversity, Nitrogen Deposition, and CO2 Affect Grassland Soil Carbon Cycling but not Storage

Content Provider	Springer Nature Link
Author	Reid, Joseph P. Adair, E. Carol Hobbie, Sarah E. Reich, Peter B.
Copyright Year	2012
Abstract	Grasslands are globally widespread and capable of storing large amounts of carbon (C) in soils, and are generally experiencing increasing atmospheric CO2, nitrogen (N) deposition, and biodiversity losses. To better understand whether grasslands will act as C sources or sinks in the future we measured microbial respiration in long-term laboratory incubations of soils collected from a grassland field experiment after 9 years of factorial treatment of atmospheric CO2, N deposition, and plant species richness on a deep and uniformly sandy soil. We fit microbial soil respiration rates to three-pool models of soil C cycling to separate treatment effects on decomposition and pool sizes of fast, slow, and resistant C pools. Elevated CO2 decreased the mean residence time (MRT) of slow C pools without affecting their pool size. Decreasing diversity reduced the size and MRT of fast C pools (comparing monocultures to plots planted with 16 species), but increased the slow pool MRT. N additions increased the size of the resistant pool. These effects of CO2, N, and species-richness treatments were largely due to plant biomass differences between the treatments. We found no significant interactions among treatments. These results suggest that C sequestration in sandy grassland soils may not be strongly influenced by elevated CO2 or species losses. However, high N deposition may increase the amount of resistant C in these grasslands, which could contribute to increased C sequestration.
Starting Page	580
Ending Page	590
Page Count	11
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	15
Issue Number	4
e-ISSN	14350629
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-03-20
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	C sequestration elevated CO2 FACE experiment soil C cycling biodiversity nitrogen deposition Environmental Management Zoology Nature Conservation Geoecology/Natural Processes Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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