NDLI: Pore water N:P and NH4 +:NO3 − alter the response of Phragmites australis and Glyceria maxima to extreme nutrient regimes

Content Provider	Springer Nature Link
Author	Tylová, Edita Steinbachová, Lenka Soukup, Aleš Gloser, Vít Votrubová, Olga
Copyright Year	2012
Abstract	Phragmites australis and Glyceria maxima are fast-growing littoral grasses often competing for similar wetland habitats. Eutrophication affects their competitiveness, but the outcome is not generally predictable due to the complexity of interrelated factors. We hypotheses that pore water N:P and NH4 +:NO3 − modify their growth and metabolic responses to the trophic status of the habitat. The hypothesis was tested under standardized conditions of long-term sand cultures. Application of N + P up to extreme levels in combination with N:P < 10 and NH4 +:NO3 − < 1 triggered positive growth response in both species. In contrast, similar N levels applied in N:P > 90 and NH4 +:NO3 − = 4 caused lower productivity, changes in resource allocation, morphology and metabolic relations (e.g. high shoot density, low shoot diameters and heights, reduced root and rhizome growth). Observed signs of stress resembled the factors associated with the reed retreat at the die-back sites. Unbalanced N levels obviously alter plant susceptibility to stresses (altering, e.g. ventilation efficiency, plant anchorage or below-ground storage capacity). The positive effect of sufficient P supply was pronounced in Glyceria. It might therefore favour Glyceria in competition with Phragmites at highly fertile habitats rich in P.
Starting Page	141
Ending Page	155
Page Count	15
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	700
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-07-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wetlands Common reed Reed sweetgrass Waterlogged soil Amino acids Freshwater & Marine Ecology Zoology Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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