Variation in the Root Regenerating Potentials of Ponderosa Pine from Four California Nurseries
To determine whether the physiological condition of Pinus ponderosa seedlings grown at 4 nurseries in California differs, the root-regenerating potentials (RRP) of seedlings were compared. At 15-day intervals from October through April, 1-0 seedlings grown from seed collected in two seed zones were lifted, root-pruned to 8 inches, and planted for 1 month in the greenhouse in sandy loam maintained at 20°C. The root systems were then examined and all newly elongated laterals 0.5 in. or longer counted to obtain a measure of the RRP. Seedling size was correlated with the Effective Night Temperature: Effective Day Temperature ratio which increases southward in the state, but seedling size was not reflected in the RRP. The RRP of seedlings at all 4 nurseries displayed the same overall seasonal trend, which involved an increase in the autumn, a peak in the spring, and a rapid decrease after the terminal bud broke. At the northernmost nursery, which is also at the highest elevation, the autumn increase in the RRP began earlier and the spring peak and subsequent decline developed later than at the others. At three of the nurseries the RRP was of the same order of magnitude; at one nursery it was significantly lower. Possible explanations are discussed. Data from this and earlier studies point to the inadequacy of any system of morphological grading when the physiological condition of the seedling is unknown. Since the RRP can readily be determined and is one measure related to survival, it is suggested that an assessment of the RRP be included in any future grading system developed for ponderosa pine in California.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
Document Type: Journal Article
Affiliations: Assistant Specialist, School of Forestry, Univ. Calif, Berkeley
Publication date: 1963-06-01
More about this publication?
- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
Forest Science is published bimonthly in February, April, June, August, October, and December.
2016 Impact Factor: 1.782 (Rank 17/64 in forestry)
Average time from submission to first decision: 62.5 days*
June 1, 2016 to Feb. 28, 2017
Also published by SAF:
Journal of Forestry
Other SAF Publications
- Submit a Paper
- Membership Information
- Author Guidelines
- Ingenta Connect is not responsible for the content or availability of external websites