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Plant Biosystems
149 (2015), H. 2
149 (2015), H. 2
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Klimaänderung
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Nitrogen deposition and drought events have non-additive effects on plant growth - Evidence from greenhouse experiments. (2015). Plant Biosystems, 149 (2015), H. 2. https://doi.org/10.60810/openumwelt-887
Abstract english
Climate change and nitrogen deposition affect biodiversity and ecosystem functioning, but interactive effects of these global change drivers are poorly understood. We analysed single and interactive effects of nitrogen (N) fertilisation and drought on the growth performance of Calluna vulgaris. We measured biomass production and allocation, tissue nutrient (N, phosphorus (P) and carbon (C)) concentrations, N allocation patterns (using 15N tracer) and plant's water status (using ä 13C signatures) as response variables in a 2-year greenhouse experiment. N fertilisation increased biomass production and biomass shoot:root ratios. 15N allocation patterns indicated an increasing aboveground N allocation following N fertilisation. Tissue ä 13C signatures were higher in N-fertilised plants. Plant responses to drought were weak. We found strong antagonistic interaction effects of N fertilisation and drought for biomass production. ä13C values peaked when N-fertilised plants were subjected to drought, indicating that N fertilisation increased the evaporative demands of Calluna plants, likely due to increased biomass shoot:root ratios, which in turn resulted in higher drought susceptibility. As an important consequence, even slight drought events may weaken the competitiveness of Calluna when interacting with enhanced airborne N loads. Single-factor studies, thus, need to be complemented by multi-factor analyses to assess conceivable impacts of co-occurring global change drivers.Quelle: http://www.tandfonline.com