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Elevated carbon dioxide in a semi-natural grassland

plant production and vegetation composition during six years

Marissink, Mark (2002). Elevated carbon dioxide in a semi-natural grassland. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Agraria, 1401-6249 ; 359
ISBN 91-576-6179-0
[Doctoral thesis]

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Abstract

This thesis is concerned with the possible effects of a further increase in atmospheric carbon dioxide on vegetation in a semi-natural grassland. It is based on an experimental field study focusing on production responses and changes in vegetation composition. A Swedish semi-natural grassland was exposed to ambient and twice ambient elevated CO2 in open-top chambers during six consecutive growing seasons. Plots without chambers constituted a control treatment. The field had been grazed previously, but when the experiment started this was replaced by a cutting regime with one cut (0 cm above the soil surface) each year in early August. Leaf-level photosynthesis and stomatal conductance, biomass production, and vegetation composition were studied. The first three growing seasons showed a 30 to 60 % increase in above-ground biomass at harvest under elevated CO2. In later years there was no difference in above-ground biomass between the treatments, but differences between treatments increased below ground. Throughout the experiment, elevated CO2 increased leaf-level photosynthesis and tended to decrease stomatal conductance. Nitrogen concentration in stems and leaves was lower at elevated CO2. CO2 effects on vegetation composition were small in comparison with effects of time and/or weather, but increased towards the end of the experiment. Legumes may benefit most from elevated CO2, which also tended to increase diversity (Shannon index) in summer, but decrease it in spring. Changes in the weather (especially precipitation) were highly directional over time. This means that weather effects are confounded with effects that are time-dependent (such as a possible succession after a change in management, or an increasing nutrient deficit). However, weather effects did appear to be decisive.

Authors/Creators:Marissink, Mark
Title:Elevated carbon dioxide in a semi-natural grassland
Subtitle:plant production and vegetation composition during six years
Year of publishing :April 2002
Volume:359
Number of Pages:57
Papers/manuscripts:
NumberReferences
ALLI. Marissink, M., R. Pettersson & E. Sindhøj. 2002. Above-ground plant production under elevated carbon dioxide in a Swedish semi-natural grassland. Agriculture, Ecosystems and Environment 93: 107-120. II. Sindhøj, E., A.-C. Hansson, O. Andrén, T. Kätterer, M. Marissink & R. Pettersson. 2000. Root dynamics in a semi-natural grassland in relation to atmospheric carbon dioxide enrichment, soil water and shoot biomass. Plant & Soil 223: 253-263. III. Marissink, M. & M. Hansson. 2002. Floristic composition of a Swedish semi-natural grassland during six years of elevated atmospheric CO2. Journal of Vegetation Science 13: 733-747. IV. Marissink, M., R. Pettersson, E. Sindhøj, O. Andrén & M. Hansson. Plant production and species composition in a semi-natural grassland during six years of elevated CO₂. Manuscript.
Place of Publication:Uppsala
ISBN for printed version:91-576-6179-0
ISSN:1401-6249
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:T Pollution > T01 Pollution
F Plant production > F40 Plant ecology
Subjects:Not in use, please see Agris categories
Agrovoc terms:carbon dioxide, waste gases, climatic change, grasslands, grazing lands, natural pastures, plant production, stomata, transpiration, plant ecology, botanical composition, sweden
Keywords:global change, photosynthesis, stomatal conductance, biodiversity, point-intercept, root/shoot ratios, grasses, forbs, legumes
ID Code:243
Department:(NL, NJ) > Institutionen för ekologi och växtproduktionslära (fr.o.m. 990101)
Deposited By: Mark Marissink
Deposited On:16 Apr 2003 00:00
Metadata Last Modified:02 Dec 2014 10:02

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