DOI: 10.5061/dryad.2rbnzs7nm
title: Effects of experimental warming on vegetative and reproductive characters of P. viviparaum in the Qinghai-Tibet Plateau

description: This dataset contains data from a simulated warming
 experiment described in the paper: “Zhang, C., Li, XT., and An,
 YM. Effects of experimental warming on vegetative and reproductive growth
 of Polygonum viviparaum in the Qinghai-Tibet Plateau. Nordic Journal of
 Botany. DOI: 10.1111/njb.03157”.  The experiment investigated
 Polygonum viviparaum, a perennial herb distributed widely in arctic and
 alpine regions, under two different levels of experimental warming
 treatments to examine effects of warming on its vegetative and
 reproductive growth. Two types of open top chambers (OTCs), large and
 small, were used to generate lower and higher warming levels. The dataset
 consists of the vegetative and reproductive characters of P.
 viviparaum in control plots, large OTCs and small OTCs. The characters
 include plant height, leaf number, length of the longest leaf, flower
 diameter, bulbil length, number of flowers per spike, number of bulbils
 per spike, flower proportion, dry weight of stem and
 leaves, dry weight of flowers per spike, dry weight of
 bulbils per spike, reproductive allocation and bulbil germination
 rate. Main results of the experiment are that (1) the increased
 temperature promoted both vegetative and reproductive growth of P.
 viviparaum, but there was a significant trade-off between them. Decreased
 reproductive allocation under warming suggested that more available
 resources were devoted to vegetative growth, resulting in increased plant
 height, leaf number and length of the longest leaf; (2) After warming, the
 number and dry weight of flowers per spike decreased while the number and
 dry weight of bulbils per spike increased, indicating more investment to
 asexual reproduction over sexual reproduction in P. viviparaum; (3) The
 increase of warming further strengthened the above variation trends of
 vegetative and reproductive growth of P. viviparaum.
description: The dataset was collected during a simulated warming
 experiment at the Haibei Alpine Meadow Ecosystem Research Station, Chinese
 Academy of Sciences. We used the linear mixed-effect model to test the
 effects of experimental warming on vegetative and reproductive characters
 of <i>P. viviparaum</i>. In the model, ‘year’ and ‘plot’ (for
 bulbil germination rate, only ‘plot’) were defined as random parameters
 and ‘treatment’ was defined as fixed parameter. Differences among L, S and
 C treatments were analyzed using Duncan's multiple range test.
 Regression analyses were used to test the relationships between vegetative
 growth and reproductive growth, vegetative growth and sexual reproduction,
 vegetative growth and asexual reproduction, sexual reproduction and
 asexual reproduction. As the analyses were performed on the same data, all
 p-values were corrected by Bonferroni correction. Statistical analyses
 were performed using SAS version 9.22 (SAS Institute, Cary, NC,
 USA).
description: The readme file contains an explanation of each of the variables
 in the dataset. Information on how the measurements were done can be found
 in the associated manuscript referenced above.