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Separating drought effects from roof artifacts on ecosystem processes in a grassland drought experiment.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2013
Author Vogel Anja, Fester Thomas, Eisenhauer Nico, Scherer-Lorenzen Michael, Schmid Bernhard, Weisser Wolfgang W, Weigelt Alexandra,
Project Mechanisms underlying plant community productivity, stability and assembly (D-A-CH/LAE)
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Original article (peer-reviewed)

Journal PloS one
Volume (Issue) 8(8)
Page(s) 70997 - 70997
Title of proceedings PloS one
DOI 10.1371/journal.pone.0070997

Open Access

URL http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0070997
Type of Open Access Publisher (Gold Open Access)

Abstract

1: Given the predictions of increased drought probabilities under various climate change scenarios, there have been numerous experimental field studies simulating drought using transparent roofs in different ecosystems and regions. Such roofs may, however, have unknown side effects, called artifacts, on the measured variables potentially confounding the experimental results. A roofed control allows the quantification of potential artifacts, which is lacking in most experiments. 2: We conducted a drought experiment in experimental grasslands to study artifacts of transparent roofs and the resulting effects of artifacts on ecosystems relative to drought on three response variables (aboveground biomass, litter decomposition and plant metabolite profiles). We established three drought treatments, using (1) transparent roofs to exclude rainfall, (2) an unroofed control treatment receiving natural rainfall and (3) a roofed control, nested in the drought treatment but with rain water reapplied according to ambient conditions. 3: Roofs had a slight impact on air (+0.14°C during night) and soil temperatures (-0.45°C on warm days, +0.25°C on cold nights), while photosynthetically active radiation was decreased significantly (-16%). Aboveground plant community biomass was reduced in the drought treatment (-41%), but there was no significant difference between the roofed and unroofed control, i.e., there were no measurable roof artifact effects. 4: Compared to the unroofed control, litter decomposition was decreased significantly both in the drought treatment (-26%) and in the roofed control treatment (-18%), suggesting artifact effects of the transparent roofs. Moreover, aboveground metabolite profiles in the model plant species Medicago x varia were different from the unroofed control in both the drought and roofed control treatments, and roof artifact effects were of comparable magnitude as drought effects. 5: Our results stress the need for roofed control treatments when using transparent roofs for studying drought effects, because roofs can cause significant side effects.
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