Forest Resource Sampling

Dr. Arseniou

Purpose of Forest Inventory

Determine as acurately as possible the volume, weight, and value of standing trees in a given area

Land Acquisition

needs net volume and value of merchantable trees growing in operable areas

Management plan cruises

Provide information on timber growth, yield, and allowable cut. intended for broad based management or long rang planning

Special Surveys

need visual or areial photos. 100% value of poles or veneer logs

simple random sampling

Divide the forest population into sampling units and randomly selecting units that will be included in the sample

Systematic sampling

choose sampling units that are equally spaced spacially or temporally. Ex. Line plot inventory

Stratified random sampling

forest population is divided into levels or strata and units are sampled randomly and independently from those groups.

Tree Tallies

simple counts of trees in different categories. EX. DBH, species, Total height, All trees etc.

Stand and stock table

used to summarize data by tree sizes and species groups

Stand table

tabulation of the total number of stems in a stand by DBH classes and species

Stock table

List the volumes of stems in a stand by DBH class and species

Limitation of fixed radius plots

Larger trees are not prioritized

time consuming

careful plot size selection