NDLI: Impacts of Soil Nitrogen and Carbon Additions on Forest Understory Communities with a Long Nitrogen Deposition History

Content Provider	Springer Nature Link
Author	Chapman, Samantha K. Devine, Kathryn A. Curran, Courtney Jones, Rachel O. Gilliam, Frank S.
Copyright Year	2015
Abstract	Rates of nitrogen (N) deposition have been historically high throughout much of the northeastern United States; thus, understanding the legacy of these high N loads is important for maintaining forest productivity and resilience. Though many studies have documented plant invasions due to N deposition and associated impacts on ecosystems, less is known about whether invasive plants will continue to increase in dominance with further shifting nutrient regimes. Using soil N and carbon additions, we examined the impact of both increasing and decreasing soil N on native and invasive understory plant dynamics over 4 years in a northeastern deciduous forest with a long history of N deposition. Despite applying large quantities of N, we found no difference in soil nitrate (NO3) or ammonium (NH4 +) pools in N addition plots over the course of the study. Indicative of the potential N saturation in these forest soils, resin-available NO3 − and NH4 + showed evidence that the added N was rapidly moving out of the soil in N addition plots. Accordingly, we also found that adding N to soil altered neither invasive nor native plant abundance, though adding N temporally increased invasive plant richness. Carbon additions decreased soil N availability seasonally, but did not alter the total percent cover of invasive or native plants. Rather than being suppressed by excess N availability, native plant species in this ecosystem are primarily inhibited by the invasive species, which now dominate this site. In conclusion, understory plant communities in this potentially N-saturated ecosystem may be buffered to future alterations in N availability.
Starting Page	142
Ending Page	154
Page Count	13
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	19
Issue Number	1
e-ISSN	14350629
Language	English
Publisher	Springer US
Publisher Date	2015-10-06
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	invasive species plant community nitrogen deposition nitrate understory carbon additions deciduous forest Ecology Plant Sciences Zoology Environmental Management Geoecology/Natural Processes Hydrology/Water Resources
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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