Two wood or metal uprights mounted in the shape of the letter "a" to support lead blocks at the upper end (22).
Hand-held clinometer used to measure slope in percent (22).
Aboveground portion of a tree, excluding the root system (29).
Shearhead on a feller-buncher that is capable of accumulating and holding two or more cut stems (35).
|active repair time|
- Machine time, mechanical delay time, scheduled operating time, delay time
- Time during which actual repair work is carried out on the machine itself or a dismantled part of the machi...
|actual productive time|
- Machine time, productive time
- Time spent using the machine to carry out the actual task (5).
Heavy shackle at the tail tree that connects the skyline to the stub line (guyline extension) (19).
In highway transport, uphill haul that requires trucks to use lower gears (10).
Yarding system employing aerial lift of logs, such as balloons or helicopters (26).
Interpreting information from aerial photographs (17).
Establishment of forest crops by artificial methods, such as planting or sowing on land where trees have never grown (28).
One of the intervals, commonly 10 or 20 years, into which the age range of tree crops is divided for classification or use. also pertains to the trees included in such an interval. for example, tr...
Lumber or other wood products that have been either dried by exposure to natural atmospheric conditions outdoors or in an unheated shed or dried to equilibrium with the surrounding atmosphere. moi... ad; воздушно-сухой;
|all live trees|
- Growing stock, rough, and rotten trees 1 inch in d.b.h. and larger.
- Tree classes
Forest or stand containing trees of almost all age classes up to and including trees of harvestable age (17).
Volume of timber that may be harvested during a given period to maintain sustained production (31).
Allocation of anticipated future forest timber yields to the present allowable cut; this is employed to increase current harvest levels (especially when constrained by evenflow) by spreading antic...
- Line used to tie down a yarder to prevent tipping on a heavy pull (32).
- A cable or line, one end of which is held in a fixed position.
- Wooden, concrete, or metal bar buried in the earth to hold a guy rope. also called a deadman (32).
- A timber which serves as a dead man.
Heavy steel blade mounted across the front of a crawler tractor. the blade can be raised and lowered, and each end can be advanced and retracted to place the blade at various angles, making it pos... bulldozer.;
|annual allowable harvest|
Quantity of timber scheduled to be removed from a particular management unit in 1 year (17).
Average annual increase in the biomass of growing-stock trees of a specified area (30).
Price of a particular timber sale based on the estimate of the timber's actual market value. the minimum acceptable price on a sale (12).
Skidding logs or trees using a mounted or trailing arch (8).
Method of controlling the annual or periodic acreage harvested from a forest, despite fluctuations in fiber-yield volumes. leads to a managed forest (17).
Timber sales in which the usda forest service sells dead timber within a given area. usually covers more than one operating season and requires the operator to return annually to remove any dead t...
With reference to a vehicle, hinged at the center for turning, as with a wheeled skidder (24). собранные;
Renewal of the forest by planting or direct seeding; establishing a new stand of trees by planting seeds or seedlings by hand or machine (17).
|average yarding distance|
Total yarding distance for all turns divided by total number of turns for a particular setting (20).
Line behind the spar tree, opposite the main line or skyline, which takes most of the pull in yarding logs (32).
Boundary line marked by blazed or painted trees indicating the cutting area (8).
Final cut in felling a tree. made on the opposite side of the direction of fall (24).
Blaze set in front of an advancing forest fire in an effort to check the wildfire by cutting off its fuel supply.
Person who rolls or slides logs down a hillside (8).
High slab-like splint, resembling a chair back, left standing on a stump above the undercut as a result of faulty felling or heavy lean of the tree (26).
Hook used with wire rope slings for gripping trees or logs to be skidded (24).
Small, cylindrical beetle of the family scolytidae, the adult of which bores into and beneath the bark of various trees for the purpose of egg laying (17).
Refers to the bark removed from a log and also to portions of wood and foreign matter such as sand, grit, or stones that may be imbedded in the bark (1).
Machine used to remove bark from pulpwood (8).
Large drum in which logs or billets are tumbled by mechanical rotation, the bark being removed by abrasive action (26).
Tool with a narrow-shaped, curved blade used in removing bark by hand. also called a spud (8).
Cross sectional area of a tree, in square feet, measured at breast height. used as a method of measuring the volume of timber in a given stand (12).
|basal area factor|
Number of units of basal area per acre (or per hectare) represented by each tree (17).
|basal area jam acre|
Land class based on total area per acre.
|basal area per acre|
Tree marked to identify the nearby location of a survey corner. also known as a witness tree (17).