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Harvard Forest Data Archive

HF026

Vegetation Patterns in Northeastern North America 1500-2000

Related Publications

Data

Overview

  • Lead: Emily Russell
  • Investigators:
  • Contact: Emily Russell
  • Start date: 1500
  • End date: 2000
  • Status: completed
  • Location: Northeastern North America
  • Latitude: +38.0 to +47.5
  • Longitude: -79.0 to -66.0
  • Elevation:
  • Taxa:
  • Release date: 2003
  • Revisions:
  • EML file: knb-lter-hfr.26.16
  • DOI: digital object identifier
  • Related links:
  • Study type: paleological
  • Research topic: historical and retrospective studies; regional studies
  • LTER core area: disturbance
  • Keywords: lakes, paleoecology, pollen, region, vegetation dynamics
  • Abstract:

    Over the last few centuries, human activities have changed the landscape of northeastern North America from mostly forested to a patchwork of forest, farmland and logged areas, back in many areas to mostly forested. Meanwhile, there have been many rapid changes in the composition of the remaining forests, for example, the amounts of hemlock (Tsuga canadensis) and beech (Fagus grandifolia) have decreased while the amount of birch (Betula spp.) has increased. How stable have been the basic vegetational patterns under the onslaught of these landscape and compositional changes? In preliminary analyses, the assemblages of major tree taxa have been zoned for every other century, using optimal splitting by information content and other techniques, to study changes in vegetation groupings over the last 500 years. Several patterns seem to be emerging on a centennial scale: First, vegetation patterns were changing in the centuries before European colonization of the area. Second, the number of zones (vegetation types, based on pollen), was greater in 1700 and 1900 than in 1500 or now. Third, the zone boundaries have moved north from 1500 to the present. Further analyses, including several more data sets will be used to refine these conclusions and to suggest explanations for the changes.

  • Methods:

    To study this question, a set of 52 pollen diagrams from lakes with detail in the last several centuries has been assembled for the northeastern United States.

  • 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:

    Russell E. 2003. Vegetation Patterns in Northeastern North America 1500-2000. Harvard Forest Data Archive: HF026.

Detailed Metadata

hf026-01: list of lakes

  1. lake.name: lake name
  2. lake.number: lake number
  3. lat.deg.n: latitude (unit: degree / missing value: NA)
  4. lon.deg.w: longitude (unit: degree / missing value: NA)
  5. elevation: elevation (unit: meter / missing value: NA)
  6. data: data availability
    • 1: in North American Pollen Database
    • 2: submitted to North American Pollen Database
    • 3: pending
    • name: contact author

hf026-02: pollen

  1. name: name of lake or pond
  2. depth: depth in centimeters below the sediment surface (unit: centimeter / missing value: NA)
  3. pollen: pollen, using abbreviations used for North American Pollen Database
  4. count: numbers of grains counted (unit: number / missing value: NA)

hf026-03: map of lakes

  • Compression:
  • Format: gif
  • Type: gif