KBS003:Baseline Spatial Variability Study

A spatial variability study conducted across the LTER Main Site area (45 ha) at KBS prior to dividing the site into 1-ha experimental plots. During the 1988 growing season a stratified unaligned sampling scheme was used to collect 400-600 geo-referenced samples across the site (uniformly planted to a single variety of soybeans) for:

  1. geomorphological characteristics (microtopography, soil horizon depths, bulk density, texture);
  2. soil chemical characteristics (pH, NO3, NH4, total C, total N, moisture, inorganic P, trace metals);
  3. soil biological characteristics (N mineralization potentials, microbial biomass C, microbial biomass N, fungal/bacterial ratios, nematodes and other soil invertebrates; seed bank size);
  4. plant weed species abundance, weed biomass at peak standing crop); and
  5. insect characteristics (major pest and predator species).

Most soil samples (0-15cm) were taken before crop emergence, plant phenology samples were taken throughout the growing season, biomass samples were taken at physiological maturity, and insect samples were taken continuously. Dried soil and plant samples are archived for potential future analysis.

  • Status: completed
  • Temporal Coverage 1988-01-01 to 1988-01-01

Tables

KBS003-001 Baseline Spatial Variability Study - Soil Physical Properties

Soil bulk density, and sand, silt and clay content of soils collected from an array of spatially referenced points prior to the start of the Main Cropping System Experiment.  

KBS003-002 Baseline Spatial Variability Study - Soil Total Carbon and Nitrogen
Baseline total carbon and nitrogen content, plus soil moisture and pH, of soils collected from an array of geo-referenced points prior to the start of the Main Cropping System Experiment.
KBS003-003 Baseline Spatial Variability Study - Elevation
Elevation data was determined for an array of geo-referenced points at the LTER Main Site prior to the start of the Main Cropping System Experiment.
KBS003-004 Baseline Spatial Variability Study - Soil Microbial Biomass/Respiration
Soil microbial biomass, respiration and counts were analyzed in soil cores taken from an array of spatially referenced points prior to the start of the Main Cropping System Experiment. 
KBS003-005 Baseline Spatial Variability Study - Nematodes
Nematode counts were determined for an array of geo-referenced points prior to the start of the Main Cropping System Experiment.
KBS003-006 Baseline Spatial Variability Study - Soybean Biomass and Carbon/Nitrogen Content
Soybean biomass at harvest was determined for an array of geo-referenced points prior to the start of the Main Cropping System Experiment.
KBS003-007 Baseline Spatial Variability Study - Nitrogen Mineralization
Nitrogen pool and mineralization rates for an array of geo-referenced points prior to the start of the Main Cropping System Experiment.
KBS003-008 Baseline Spatial Variability Study - Seed Bank
The seedbank was analyzed for an array of geo-referenced points prior to the start of the Main Cropping System Experiment.
KBS003-009 Plot Polygons
Plot polygons for the main LTER site

Protocols

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