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Harvard Forest Data Archive


Short-Term Effects on Vegetation in Soil Warming Plus Nitrogen Addition Experiment at Harvard Forest 2006

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  • Lead: Sydne Record, Serita Frey, Aaron Ellison
  • Investigators:
  • Contact: Sydne Record
  • Start date: 2006
  • End date: 2006
  • Status: completed
  • Location: Prospect Hill Tract (Harvard Forest)
  • Latitude: +42.54
  • Longitude: -72.18
  • Elevation: 365 meter
  • Taxa:
  • Release date: 2010
  • Revisions:
  • EML file: knb-lter-hfr.163.10
  • DOI: digital object identifier
  • EDI: data package
  • DataONE: data package
  • Related links:
  • Study type: short-term measurement
  • Research topic: large experiments and permanent plot studies
  • LTER core area: inorganic nutrients, disturbance
  • Keywords: diversity, nitrogen, soil warming
  • Abstract:

    The purpose of this experiment is to examine the interactive affects of warming and N additions on plant diversity. The experiment consists of four treatments (control, heated +N, heated -N, +N only) with six replicates per treatment in a completely randomized design. Average soil temperature in the heated plots will be elevated 5 deg C above ambient by the use of buried heating cables placed at 10 cm depth in the soil and spaced 20 cm apart. The heating cables will be controlled by a data logger that monitors thermistors (5 per plot) every 10 min. Plots will automatically turn on and off to maintain a 5 deg C temperature difference between the heated and control plots. The N addition plots (heated +N, +N only) will be fertilized following the protocol of the Chronic Nitrogen Addition Study. An aqueous solution of NH4NO3 will be applied at a rate equivalent to the low N plots at the chronic N study (5 g m-2 yr-1). Fertilizer will be applied in equal monthly doses during the growing season (Apr-Oct). The control plots and unfertilized, heated plots (heated -N) will receive water only.

  • Methods:

    To sample plants, we counted all stems of every plant in each 3m x 3m plot.

    Species codes:

    Acepen: Acer pennsylvanicum

    Acerub: Acer rubrum

    Acerubs: Acer rubrum seedling

    Aranud: Aralia nudicaulis

    Betale: Betula alleghaniensis

    Betlen: Betula lenta

    Betspp: Betula sp. (seedling)

    Carpen: Carex pensylvanica

    Casden: Castanea dentata

    Clibor: Clintonia borealis

    Craspp: Craetagus species (seedling)

    Coptri: Coptis trifolia

    Denobs: Dendrolycopodium obscurum

    Denpun: Dennstaedtia punctilobula

    Dipcom: Diphasiastrum complanatum

    Dryspp:Dryopteris species

    Faggra: Fagus grandifolia

    Gaupro: Gaultheria procumbens

    Goopub: Goodyera pubescens

    Hupluc: Huperzia lucidula

    Lyolig: Lyonia ligustrina

    Maican: Maianthemum canadense

    Medvir: Medeola virginiana

    Mitrep: Mitchella repens

    Monuni: Monotropa uniflora

    Pinstr: Pinus strobus

    Pruser: Prunus serotina

    Quealb: Quercus alba

    Querub: Quercus rubra

    Smirac: Smilacina racemosa

    Tribor: Trientalis borealis

    Tsucan: Tsuga canadensis

    Uvuses: Uvularia sessilifolia

    Unkspp: Unknown species (seedling with cotyledons only)

    Vaccor: Vaccinium corymbosum

    Vacang: Vaccinium angustifolium

    Vacvac: Vaccinium vacillans

    Vibace: Viburnum acerifolium

    Vibden: Viburnum dentatum

    Viblen: Viburnum lentago

  • Use:

    This dataset is released to the public under Creative Commons license CC BY (Attribution). Please keep the designated contact person informed of any plans to use the dataset. Consultation or collaboration with the original investigators is strongly encouraged. Publications and data products that make use of the dataset must include proper acknowledgement.

  • Citation:

    Record S, Frey S, Ellison A. 2010. Short-Term Effects on Vegetation in Soil Warming Plus Nitrogen Addition Experiment at Harvard Forest 2006. Harvard Forest Data Archive: HF163.

Detailed Metadata

hf163-01: N plants

  1. year: year of the experiment 2006
  2. plot: plot number (1-24)
  3. treatment: treatment
    • 1: Control
    • 2: Warm
    • 3: Nitrogen
    • 4: Warm Nitrogen
  4. species: species code, see methods
  5. stems: number of stems (unit: number / missing value: NA)