1. (a) General. Beginning with the 1977-78 fiscal year, privately owned land and land acquired for state forest purposes which is primarily devoted to and used for growing and harvesting timber and is zoned for a minimum 10-year period as timberland production zone (TPZ) will be valued for property taxation on the basis of its use for growing and harvesting timber, plus the value, if any, attributable to existing, compatible, nonexclusive uses of the land.

2. (b) Site Quality. Timberland is rated for productivity based upon its ability to produce wood growth on trees. Five general site classes are established wherein Site I denotes areas of highest productivity, Site II and Site III denote areas of intermediate productivity, and Site IV and Site V denote areas of lowest productivity. The five site quality classes are set forth within each of three general forest types: redwood, Douglas fir, and mixed conifers.

   Land zoned as timberland production zone (TPZ) shall be graded by the assessor using the following site classification table as a measure of land productivity.

   TIMBERLAND PRODUCTION ZONE SITE CLASSIFICATION TABLE

   Productivity Potential

   Young-Growth Redwood¹

   Douglas Fir²

   Ponderosa Pine Jeffrey Pine, Mixed Conifer & True Fir³

   Site Class

   Site Index

   Site Class

   Site Index

   Site Class

   Site Index

   Site Index

   Feet @ 100 yrs.

   Feet @ 100 yrs.

   Feet @ 100 yrs.

   Feet @ 300 yrs.

   180 or

   194 or

   114 or

   163 or

   Highest

   I

   more

   I

   more

   I

   more

   more

   Intermediate

   II

   155-179

   II

   164-193

   II

   93-113

   138-162

   III

   130-154

   III

   134-163

   III

   75-92

   113-137

   Lowest

   IV

   105-129

   IV

   103-133

   IV

   60-74

   88-112

   Less Than

   Less Than

   Less Than

   Less Than

   V

   105

   V

   103

   V

   60

   88

   ¹ Lindquist, James L., and Marshall N. Palley. Empirical yield tables for young-growth redwood, Calif. Agr. Exp. Stn. Bull. 796, 47 pp., 1963.

   ² McArdle, Richard E., and Walter H. Meyer. The yield of Douglas fir in the Pacific Northwest. USDA Tech. Bull. 201, 74 pp., Rev. 1961. Adjusted to average height of dominant trees after Forest Research Note No. 44, Pacific Northwest Forest and Range Experiment Station, by Forest Survey, Calif. Forest and Range Exp. Stn., 1948.

   ³ Dunning, Duncan. A site classification for the mixed conifer selection forests of the Sierra Nevada. USDA Forest Serv. Calif. Forest and Range Exp. Stn. For. Res. Note 28, 21 pp., 1942.

   YOUNG-GROWTH REDWOOD

   Site index based on average height of dominant trees at breast height age of 100 years. Use in young-growth redwood stands in which more than 20 percent of the stand by basal area is redwood and when sufficient dominant redwood trees are available to determine site index.

   DOUGLAS FIR

   Site index based on average height of dominant trees at age 100 years. Use in young-growth redwood stands in which 20 percent or less of the stand by basal area is redwood or when sufficient dominant redwood trees are not available to determine site index. Use also in old-growth redwood stands. In such cases, measure Douglas fir trees for determining site index. Also use for Sitka spruce, grand fir, hemlock, bishop's pine, and Monterey pine stands.

   PONDEROSA PINE, JEFFREY PINE, MIXED CONIFER, AND TRUE FIR

   Site index based on average height of dominant trees at age 100 and 300 years. Use also for lodgepole pine stands. For old-growth stands, use height of dominants at age 300 years.

3. (c) Operability. Timberland shall be rated for operability based upon such factors as accessibility, topography, and legislative or administrative restraints. On or before December 31, 1979, two classes of operability shall be used by the assessor and designated as operable or inoperable. Areas of inoperable land must be identified by the assessor. For the purpose of land site classification, inoperable means that any of the following circumstances are applicable:

   1. (1) Extreme physical barriers prevent access.
   2. (2) Legal or administrative restraints prevent access or harvest.
   3. (3) Rocky ground, steep slopes, or sterile soil prevent growing or harvesting merchantable timber.

Note: Authority cited: Section 15606, Government Code; Section 38701, Revenue and Taxation Code. Reference: Sections 434.1 and 38204, Revenue and Taxation Code.

History

1. New section filed 2-1-77; effective thirtieth day thereafter (Register 77, No. 6).

2. Amendment of Note filed 10-26-77; effective thirtieth day thereafter (Register 77, No. 44).

3. Amendment filed 9-7-83; effective thirtieth day thereafter (Register 83, No. 37).