Section 1537.1  Definitions

"Afforestation" means the establishment of a tree crop on an area from which trees have always or long been absent.

"Basal Area" means the area of the cross-section of a tree stem at breast height, and is used to express relative density of trees per acre.

"DBH" means diameter breast height (DBH) defined as 4½ feet above the ground level.

"District Forester, Regional Administrator, Forest Management Program Manager" are employees of the Department of Natural Resources who are designated by position title per official position description and specification on file with the Department of Central Management Services.

                        "Forest" means an area whose principal crop is trees.

                        "Reforestation" means the natural or artificial restocking with trees of forest land.

                        "Regeneration" means the renewal of a tree crop by natural or artificial means.

"Silviculture" means the science and art of cultivating forest crops for the production of goods and services; the theory and practice of controlling forest establishment, composition and growth.

"Stand" means a community of trees possessing sufficient uniformity in regard to composition, density, age, spatial arrangement, or condition, thus forming a silvicultural or management entity.

"Stocking" means subjective indication in a forest of the number of trees as compared to the desirable number for best results.  (For example – In an upland forest with an average tree diameter of 3 inches, 38 square feet of basal area is acceptable.  Where the trees average 18 inches, the acceptable level is 77 square feet, stocking guidelines are to be found in "Recommended Silvicultural and Management Practices for Illinois Hardwood Forest Types" (1972) Extension Forester, Illinois Cooperative Extension Service, University of Illinois, 110 Mumford Hall, Urbana, IL 61081 (No later editions or amendments are included)).

"Timber" means trees, standing or felled, and parts thereof, excluding Christmas trees and producers of firewood.

"Timber Grower" means the owner, tenant or operator of land in this state who has an interest in, or is entitled to receive any part of the proceeds from, the sale of timber grown in this State and includes persons exercising authority to sell timber.

"Timber Stand Improvement (TSI)" is a term comprising all intermediate cuttings or other silviculture treatments made to improve the composition, condition and increment of a timber stand.

(Source:  Amended at 14 Ill. Reg. 18222, effective October 29, 1990)