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  • Nitrogen addition stimulates litter decomposition rate: From the perspective of the combined effect of soil environment and litter quality
Title: Nitrogen addition stimulates litter decomposition rate: From the perspective of the combined effect of soil environment and litter quality
Award ID(s):
1831944
PAR ID:
10478484
Author(s) / Creator(s):
; ; ;
Publisher / Repository:
Elsevier
Date Published:
Journal Name:
Soil Biology and Biochemistry
Volume:
179
Issue:
C
ISSN:
0038-0717
Page Range / eLocation ID:
108992
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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    Dryland ecosystems cover nearly 45% of the Earth’s land area and account for large proportions of global annual productivity and carbon pools. However, predicting rates of plant litter decomposition in these vast ecosystems has proven challenging due to their distinctly dry and often hot climate regimes, and potentially unique physical drivers of decomposition. In this study, we elucidated the role of photopriming, i.e. potential for enhancement of microbial decay due to exposure of standing leaf litter to solar radiation prior to litterfall. We exposed litter substrates to three different UV radiation treatments simulating three-months of UV radiation exposure in southern New Mexico: no light, UVA+UVB+visible, and UVA+Visible. There were three litter types: mesquite leaflets (Prosopis glandulosa, litter with nitrogen (N) concentration), filter paper (pure cellulose), and basswood (Tilia spp, high lignin concentration). We deployed the photoprimed litter in the field within a large scale precipitation manipulation experiment: ~50% precipitation reduction, ~150% precipitation addition, and ambient control. 
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