DOI: 10.5061/dryad.s4mw6m96c
title: Potential use of Helianthus tuberosus to suppress the invasive alien plant Ageratina adenophora under different shade levels

description: This dataset contains data from field experiments described in
 the paper: “Shen, S., Xu, G., Li, D., et al.
 (2021) Potential use of Helianthus tuberosus to suppress the
 invasive alien plant Ageratina adenophora under different shade
 levels. BMC Ecology and Evolution,
 https://doi.org/10.1186/s12862-021-01826-5”. The experiment examines the
 plant growth, photosynthesis, and competitive ability of the crop
 Helianthus tuberosus L. (Jerusalem artichoke) and the
 invasive alien plant Ageratina adenophora (Spreng.) R. M. King
 and H. Rob under varying shade levels by utilizing a de Wit replacement
 series method. Main results of the experiments are that: The main stem,
 leafstalk length, leaf area, underground biomass, and aboveground biomass
 of A. adenophora were significantly lower compared to H.
 tuberosus in monoculture although A. adenophora had a greater
 number of branches that were longer on average. Under full
 sunlight, the total shoot length (stem + branch length), main stem length
 and branch length of A. adenophora were significantly
 suppressed (P &lt; 0.05) by increasing proportions of H.
 tuberosus, and the same morphological variables of H. tuberosus
 were significantly higher with decreasing proportions of H.
 tuberosus. With increasing shade rates and plant ratios,
 the plant height, branch, leaf, and biomass of both plants were
 significantly suppressed, but to a greater degree in the case of A.
 adenophora. The net photosynthetic rate (Pn) of H.
 tuberosus and A. adenophora increased gradually
 from July to September, then decreased in October. The Pn of H.
 tuberosus was consistently higher than that of A. adenophora.
 Although the Pn for both species was significantly reduced with
 increasing shade rates and plant ratios, A.
 adenophora experienced greater inhibition than H.
 tuberosus. The relative yield (RY) of A.
 adenophora was significantly less than 1.0 (P &lt; 0.05) in
 mixed culture under all shade levels, indicating that the intraspecific
 competition was less than interspecific competition. The RY of H.
 tuberosus was significantly less than 1.0 under 40–60%
 shade and greater than 1.0 (P &lt; 0.05) under 0–20% shade in mixed
 culture, respectively, showing that intraspecific competition was higher
 than interspecific competition under low shade, but the converse was true
 under high shade. The relative yield total (RYT) of A.
 adenophora and H. tuberosus was less than 1.0
 in mixed culture, indicating that there was competition between the two
 plants. The fact that the competitive balance (CB) index of H.
 tuberosus was greater than zero demonstrated a higher
 competitive ability than A. adenophora even at the highest shade
 level (60%). 
description: The dataset was collected during the April<i>–</i>October 2019 growing season at the Agricultural Environment and Resource Research Institute, Yunnan Academy of Agricultural Sciences, in Xiaojie Town, Songming County, utilizing a de Wit replacement series method.
description: The readme file contains an explanation of each of the variables in the dataset and its measurement units. #NA =  values not available. Information on how the measurements were done can be found in the associated manuscript referenced above.