Dataset: 1993 Branch Ion Deposits

Methods

The methods followed in the creation of the dataset, including description of field, laboratory and processing steps, and quality control procedures

Past Methods (No longer in use)

• Comparison of chemistry of foliar leachate
  Started: 1991-07-01
  Ended: 1992-12-30

  To identify the relative importance of foliage vs stems in canopy ion exchange, a comparison of chemistry of foliar leachate from normal and artificially defoliated branches, and evaluating the kinetics of ion exchange in each.
• Treatments and analysis
  Started: 1991-07-01
  Ended: 1992-12-30

  Multiple paired branches from 2 open-grown trees were used to receive treatments. One branch per pair was manually defoliated in early July. Articificial precipitation at pH 4.4 was applied for three hours in branch chambers and foliar leachate collected every 15 min. Foliage and leachate samples were analyzed for all major nutrient cations and anions. Lab studies examined the ion transport properties of isolated leaf cuticles from the field foliage in order to calculate ion permeability rates.
• Contribution of leaf surface deposits to cano
  Started: 1991-07-01
  Ended: 1992-12-30

  To evaluate the contribution of leaf surface deposits to canopy ion exchange a comparison of the chemistry of leachate from sugar maple foliage on small branches that had been previously washed with an acidic solution at pH 3.3, deionized water, or left unwashed. Thirty branches chosen from 4 trees were used. A total of 6 treatment compinations (3 prewashes X 2 acid mists) were used and the experiment was replicated 5 times for a total of 30 branches treated.
• Leachate sample collection
  Started: 1991-07-01
  Ended: 1992-12-30

  Leachate samples were collected sequentially from each chamber over 15 min. intervals during the first hour and over 30 min. intervals during the second hour for a total of 6 leachate samples per chamber per replicate. Leaf and stem area determinations were made and chemical analyses. Leaf cuticle samples from treated foliage was collected for additional measurement of cuticular ion permeabilities. Leachate samples were analyzed for major ions.

Dataset Fields

Detailed documentation of the fields comprising the dataset, including the type of measurement, units where applicable, and any controlled vocabularies or code lists present in the data

Sampling Equipment

Equipment and software used to collect data, including how that equipment was used.

Site Characteristics

The spatial extent of the dataset site coverage, and descriptions of the spatial extent and context for the data collection

• Site Description

  The Proctor Maple Research Center consists of about 200 acres of wooded and open land. Approximately 35-40 acres is an actively managed sugarbush for maple syrup production and research.

  Minimum Altitude: 395 meters

  Maximum Altitude: 405 meters