NDLI: Nitrogen deposition increases susceptibility to drought - experimental evidence with the perennial grass Molinia caerulea (L.) Moench

Content Provider	Springer Nature Link
Author	Friedrich, Uta Oheimb, Goddert Kriebitzsch, Wolf Ulrich Schleßelmann, Kristina Weber, Malte Sebastian Härdtle, Werner
Copyright Year	2011
Abstract	We investigated the response of the perennial grass Molinia caerulea (L.) Moench to combined effects of fertilization (N, P) and drought events. We hypothesized that N fertilization increases, and drought decreases productivity, but that N addition strengthens negative effects caused by drought.Within a full-factorial 2-year greenhouse experiment we measured biomass productivity and allocation, tissue nutrient concentrations and nitrogen allocation patterns using $^{15}$N as a tracer.N fertilization caused a strong increase in productivity, but effects of drought were almost insignificant. However, we found strongly interrelated, non-additive effects of fertilization and drought, expressed by a strong increase of necrotic tissue. Dead aboveground biomass showed the highest values for N and $^{15}$N.Accelerated productivity of aboveground tissue under N fertilization resulted in increased evaporative demands and thus higher drought susceptibility. In addition $^{15}$N allocation patterns showed that fertilization-drought treatments disenabled plants’ control of their N allocation. Molinia was unable to withdraw leaf N during the dieback of aboveground tissue. Due to the lack of an adaptive strategy to the combined effects of fertilization and drought, increasing summer drought may weaken the competitive performance of species with traits comparable to those of Molinia in N-fertilized environments.
Starting Page	59
Ending Page	71
Page Count	13
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	353
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-10-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biomass allocation Climate change Heathland Molinia caerulea $^{15}$N tracer Nutrient allocation Plant Sciences Plant Physiology Soil Science & Conservation Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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