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

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Nitrogen deposition increases susceptibility to drought - experimental evidence with the perennial grass Molinia caerulea (L.) Moench. / Friedrich, Uta; Oheimb, Goddert; Kriebitzsch, Wolf-Ulrich et al.
In: Plant and Soil, Vol. 353, No. 1-2, 04.2012, p. 59-71.

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@article{18cc47f06b354ca9ab10a0729b714e4f,
title = "Nitrogen deposition increases susceptibility to drought - experimental evidence with the perennial grass Molinia caerulea (L.) Moench",
abstract = "Aims: 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. Methods: Within a full-factorial 2-year greenhouse experiment we measured biomass productivity and allocation, tissue nutrient concentrations and nitrogen allocation patterns using 15N as a tracer. Results: 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 15N. Conclusions: Accelerated productivity of aboveground tissue under N fertilization resulted in increased evaporative demands and thus higher drought susceptibility. In addition 15N 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.",
keywords = "Biology, Biomass allocation, Climate change, Heathland, allocation Molinia caerulea, 15N tracer, Nutrient allocation, Ecosystems Research",
author = "Uta Friedrich and Goddert Oheimb and Wolf-Ulrich Kriebitzsch and Kristina Schle{\ss}elmann and Weber, {Malte Sebastian} and Werner H{\"a}rdtle",
year = "2012",
month = apr,
doi = "10.1007/s11104-011-1008-3",
language = "English",
volume = "353",
pages = "59--71",
journal = "Plant and Soil",
issn = "0032-079X",
publisher = "Springer Science and Business Media Deutschland GmbH",
number = "1-2",

}

RIS

TY - JOUR

T1 - Nitrogen deposition increases susceptibility to drought - experimental evidence with the perennial grass Molinia caerulea (L.) Moench

AU - Friedrich, Uta

AU - Oheimb, Goddert

AU - Kriebitzsch, Wolf-Ulrich

AU - Schleßelmann, Kristina

AU - Weber, Malte Sebastian

AU - Härdtle, Werner

PY - 2012/4

Y1 - 2012/4

N2 - Aims: 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. Methods: Within a full-factorial 2-year greenhouse experiment we measured biomass productivity and allocation, tissue nutrient concentrations and nitrogen allocation patterns using 15N as a tracer. Results: 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 15N. Conclusions: Accelerated productivity of aboveground tissue under N fertilization resulted in increased evaporative demands and thus higher drought susceptibility. In addition 15N 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.

AB - Aims: 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. Methods: Within a full-factorial 2-year greenhouse experiment we measured biomass productivity and allocation, tissue nutrient concentrations and nitrogen allocation patterns using 15N as a tracer. Results: 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 15N. Conclusions: Accelerated productivity of aboveground tissue under N fertilization resulted in increased evaporative demands and thus higher drought susceptibility. In addition 15N 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.

KW - Biology

KW - Biomass allocation

KW - Climate change

KW - Heathland

KW - allocation Molinia caerulea

KW - 15N tracer

KW - Nutrient allocation

KW - Ecosystems Research

UR - http://www.scopus.com/inward/record.url?scp=84858340741&partnerID=8YFLogxK

U2 - 10.1007/s11104-011-1008-3

DO - 10.1007/s11104-011-1008-3

M3 - Journal articles

VL - 353

SP - 59

EP - 71

JO - Plant and Soil

JF - Plant and Soil

SN - 0032-079X

IS - 1-2

ER -

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