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Harvard Forest Data Archive


Baseline Plant Abundances on Garlic Mustard Experiment Plots at Harvard Forest 2013

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  • Lead: Kristina Stinson, Serita Frey
  • Investigators: Jason Aylward, Dustin Haines
  • Contact: Information Manager
  • Start date: 2013
  • End date: 2013
  • Status: completed
  • Location: Prospect Hill Tract (Harvard Forest)
  • Latitude: +42.529392
  • Longitude: -72.190414
  • Elevation: 316 meter
  • Taxa: Alliaria petiolata (garlic mustard)
  • Release date: 2016
  • Revisions:
  • EML file: knb-lter-hfr.272.3
  • DOI: digital object identifier
  • EDI: data package
  • DataONE: data package
  • Related links:
  • Study type: long-term measurement
  • Research topic: biodiversity studies; invasive plants, pests and pathogens; large experiments and permanent plot studies
  • LTER core area: populations, disturbance
  • Keywords: abundance, community composition, invasive species, plant species, species diversity, understory vegetation
  • Abstract:

    This is a five year project that investigates the reassembly of soil fungi and native plants in forests affected by biological invasion. The experiment brings together regional land managers to create comparative eradications of garlic mustard at nine distinct sites along a natural climate and nitrogen deposition gradient in New England. This dataset represents baseline plant abundances from 2013 at nine study plots in Harvard Forest. Species richness, Shannon diversity, and Pielou’s evenness were not different between invaded and non-invaded plots at Harvard Forest.

  • Methods:

    Three plots each were assigned to one of three treatments: Non-invaded (plots that have no garlic mustard), Invaded (plots with garlic mustard), and Pulled (plots with garlic mustard in 2013 on which all garlic mustard plants are manually pulled in subsequent years). Reference and Pulled plots were placed in patches of garlic mustard densities of at least 20 plants per square meter. Non-invaded plots were placed within 20 meters of garlic mustard plots with similar tree canopy composition, slope, and aspect. Plots were 3×3 m (9 m2) with a central sampling area 2×2 m (4 m2). All vascular plants one meter and less in height were counted and identified to the species level. In addition, garlic mustard plants were identified as 1st or 2nd year plants. The plots were selected to represent the native vegetation but other invasive plants besides garlic mustard were encountered and were included in the survey. Plant diversity indices (richness, Shannon diversity, and Pielou’s evenness) were compared between Invaded and Non-invaded plots using generalized linear models.

  • Use:

    This dataset is released to the public under Creative Commons CC0 1.0 (No Rights Reserved). Please keep the dataset creators informed of any plans to use the dataset. Consultation with the original investigators is strongly encouraged. Publications and data products that make use of the dataset should include proper acknowledgement.

  • Citation:

    Stinson K, Frey S. 2016. Baseline Plant Abundances on Garlic Mustard Experiment Plots at Harvard Forest 2013. Harvard Forest Data Archive: HF272 (v.3). Environmental Data Initiative:

Detailed Metadata

hf272-01: plant survey summer 2013

  1. date: date of field data collection
  2. treatment: plot treatment
    • Invaded: plots occupied by garlic mustard
    • Non-invaded: plots not occupied by garlic mustard
    • Pulled: plots with garlic mustard plants manually removed (by pulling them out of the ground)
  3. replicate: plot replicate number for the specific treatment type (three replicate plots each)
  4. species: species
    • acerpe: Acer pensylvanicum (striped maple)
    • acerpl: Acer platanoides (Norway maple)
    • acerru: Acer rubrum (red maple)
    • acersa: Acer saccharum (sugar maple)
    • allipe_1: Alliaria petiolata (garlic mustard) - first year plant
    • allipe_2: Alliaria petiolata (garlic mustard) - second year plant
    • allipe_total: Alliaria petiolata (garlic mustard) - first and second year plants
    • betupa: Betula papyrifera (paper birch)
    • dennpu: Dennstaedtia punctilobula (eastern hay-scented fern)
    • euonal: Euonymus alatus (burning bush)
    • eurydi: Eurybia divaricata (white wood aster)
    • fraxam: Fraxinus americana (white ash)
    • HF_Unk_2: unidentified species
    • ilexve: Ilex verticillata (common winterberry)
    • maiaca: Maianthemum canadense (Canada mayflower)
    • maiara: Maianthemum racemosum (feathery false lily of the valley)
    • onocse: Onoclea sensibilis (sensitive fern)
    • prunse: Prunus serotina (black cherry)
    • querru: Quercus rubra (northern red oak)
    • querve: Quercus velutina (black oak)
    • trilsp: Trillium sp. (trillium)
    • Unk_opp_seed: unidentified species
    • vibual: Viburnum alnifolium (hobblebush)
  5. abundance: count data for number of individuals per species per 4 meter square (2 X 2 meter) plot (to get densities per square meter, divide these data by 4) (unit: number / missing value: NA)