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U.S. DEPARTMENT OF ACRICULTUAE C NATURAL RESOURCES CONSERVATION SERVICE WOODLAND MANAGEMENT AND PRODUCPI VI TY Endnote -- WOODLAND MANAGEMENT ANO PRODUCTIVITY--Continued PAGE 3 OF 7 08/37/00 blown down by the wind. Strong winds may damage trees, but they do not uproot them. A rating of "Moderate' indicates [hat some trees can be blown down during periods when the soil is wet and winds are moderate or strong. A rating of "Severe" indicates that many trees can be 61own down during these periods. PLANT COMPETITION ratings indicate [he degree to which undesirable species are expected Co invade and grow when openings axe made in the tree canopy. The main factors that affect plant competition are the depth to the water table and [he available water capacity. A racing of "Slight" indicates that competition from undesirable planes ie not likely to prevenc natural regeneration or suppress the more desirable species. Planted seedlings can become established wi thou[ undue compeer Lion. A racing of "Moderate" intlica[es that competition may delay the establishment of desirable epeciea. Competition may hamper stand Bevel opmen [, but it will not prevent Che eventual tlevelopmenr of fully stocked stands. A racing of "Severe" indicates that competi [ion can be expected to prevenc re9enera ti on unless precautionary measures are appl red. The potential productivity of merchantable or COMMON TREES on a soil is expressed as a site index and as a volume number. The SITE INDEX is [he average height, in fee[, that dominant and codomirtant trees of a given epeciea attain in a epecif ietl number of years. The site index applies to fully stocked, even-aged, unmanaged stands. Commonly grown trees are Chose that woodland managers generally favor in intermediate or improvement cuttings. They are selected on Lhe basis Of growth rate, quality, value, and ma rkecability. Tn.. VOLUME OF WOOD FIBER, a number, is [he yield likely to be produced by the moat important trees. Thi9 number ie expressed as cubic meters per hectare per year, indicates the amount of wood fiber produced in a fully stocked, even- aged stand. Cubic me tars per hectare converts to cubic feet per acre per year as follows: (1 ml/ha 19.3 Eta/acl. The 19.3 number is rounded up from 14.7999. The TREES COMMONLY MANAGED FOR to plant are chose that are auitaDle far Commercial wood production.