Depth profiles of percent carbon in some of the pedons from Lewis watershed.

Sample sites for islands of fertility project. Pits were described and sampled by the Soils and Biogeochemistry Graduate Group, Feb. 2005.

Simple comparison of total carbon and nitrogen (kg/sq. m) from two pits under oak canopy vs. under buckwheat bushes.

depth-function aggregated mean +- 1 standard deviation

linear model (piece-wise splines), conditioned by clay content, fit + 95% CI

linear model (piece-wise splines) fit + 95% CI

 
Premise
Setting up sampling designs is a non-trivial aspect to any field experiment that includes a spatial component. The sp package for R provides a simple framework for generating point sampling schemes based on region-defining features (lines or polygons) and a sampling type (regular spacing, non-aligned, random, random-stratified, hexagonal grid, etc.). The rgdal package provides a set of functions for importing/exporting common vector data formats. This example demonstrates simple import/export, iterating over sp objects, and reconstituting new objects from lists of objects. A more complex sampling scheme is demonstrated here.

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Site Description:

• Description on the US Forest Service site