NDLI: Nutrient amendments in a temperate grassland have greater negative impacts on early season and exotic plant species

Content Provider	Springer Nature Link
Author	Pan, Jean J. Ammerman, Deborah Mitchell, Randall J.
Copyright Year	2010
Abstract	Among the greatest challenges currently facing terrestrial plant communities are anthropogenic nutrient amendments. Nutrient inputs can change community attributes, such as diversity and composition, and have been implicated in the increasing dominance of certain groups of species, like exotics. Overall effects of nutrients will likely be contingent on other factors in the community. One such factor is within-season change in plant communities, which has seldom been examined but may be of considerable importance. We examined within-season effects of nutrient manipulations (fertilization and litter removal) on overall community attributes and different species groups in a temperate grassland. We found the effects of nutrient amendments varied significantly over the growing season. Fertilization reduced species richness and diversity at all census points, but had the greatest effects on communities early and late in the growing season. There were few seasonal effects on species richness within functional groups, suggesting that nutrient effects were consistent and established early. Although fertilization reduced both native and exotic forb species richness throughout the season, exotics surprisingly suffered greater species losses than natives. Comparisons between within-season data and data from the end of season showed nutrient amendments have stronger community effects than previously recognized. We found that differences in cumulative species richness (all species detected during the growing season) between fertilized and unfertilized plots were greater than differences in species richness measures from any single census date. Our results suggest that predicting the overall response of plant communities to anthropogenic nutrient amendments will require thorough temporal assessments, particularly of early season species, which are generally overlooked in community studies.
Starting Page	853
Ending Page	864
Page Count	12
File Format	PDF
ISSN	13850237
Journal	Plant Ecology
Volume Number	212
Issue Number	5
e-ISSN	15735052
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-12-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Seasonal effects Species diversity Species richness Plant functional groups Fertilization Litter removal Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Plant Science

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