Progress 09/01/01 to 10/01/06
Outputs
The long-term productivity study with the U.S. Forest Service, LSU, and industry cooperators was re-measured, as was a study on the impacts of volunteer seedlings in a loblolly pine plantation. Miller, J.H., Allen, H. LEE, Zutter, B.R., Zedaker, S.M. Newbold, R.A. Soil and Pine Foliage Nutrient Changes to Mid-rotation and Their Correlation to Growth for 13 Loblolly Pine Plantations after Early Woody and Herbaceous Competition Control. (submitted) Carter, M., Dean, T., Wang, Z. and Newbold, R. Impacts of harvesting and post-harvest treatments on bulk density, soil strength, and early growth of Pinus taeda: An LTSP affiliated study. (submitted) Newbold, R.A. and Holley, A.G. Impacts of Volunteer Pine Seedlings in Genetically Improved Loblolly Pine Plantations. (in progress)
Impacts
These data will continue to contribute to the evaluation of intensive forest management practices on the long-term productivity of forested sites.
Publications
- No publications reported this period
|
Progress 01/01/03 to 12/31/03
Outputs
Annual measurements were made on the Bryceland, LA component of the long-term productivity study in conjunction with Louisiana State University, the USDA Forest Service, and industry cooperators. A cooperators meeting was held to address future plans for the study. A symposium was planned to be held in New Orleans inconjunction with the NCASI meeting in July 2004 to address productivity and sustainability issues.
Impacts
Good data sets from a number of locations and cultural treatments are being generated. These data will provide long-term, statistically sound evidence of effects, both positive and adverse, of intensive pine culture in the west Gulf region.
Publications
- 2003. Miller, J.H., B.R. Zutter, R.A. Newbold, M.B. Edwards, and S.M. Zedaker. Stand Dynamics and plant Associates of Loblolly Pine Plantations to Midrotation after Early Intensive Vegetation Management--A southeastern United States Regional Study. Sou. Journ. Appl. For. 27(4):221-236.
- 2003. Miller, J.H., B.R. Zutter, R.A. Newbold, M.B. Edwards, and S.M. Zedaker. Growth and Yield Relative to Competition for Loblolly Pine Plantations to Midrotation--A Southeastern United States Regional Study. Sou Jorn. Appl. For. 27(4)237-252.
- 2003. Deckard, Donald L., Ray A. Newbold, and Clyde G. Vidrine. Benchmark Roundwood Delivery cycle-times and potential efficiency gains in the Southern U.S. Forest Products Journal. 53(7/8):61-69.
|
Progress 01/01/02 to 12/31/02
Outputs
Data on the impacts of volunteer seedlings in loblolly pine plantations were collected and analyzed. At the conclusion of the 2002 growing season (stand age 6), these stands were beginning to express the impacts of pine-to-pine competition. There was a slight difference between two. The average DBH at location 1 was 3.72 inches and 20.0 feet in height. At location 2 the average DBH was 3.29 inches and the average height was 18.4 feet. The effect of competition was beginning to be expressed, but across the range of abundance (100 to 2000 volunteers) there was not yet a trend suggesting a level that pre-commercial thinning would be justified. An analysis of variance indicated no significant differences in DBH or height across densities, but there was a difference in DBH between the competition versus no competition classes At the time the study was installed, planted seedlings were identified as best they could be by their dominance and spacing. That choice was not
correct in all cases. But in general, the planted seedlings which have the advantages of one year's growth in a nursery, and an assumed genetic advantage, are larger than the volunteer seedlings. If this early expression of dominance holds until such a time as a commercial thinning could be conducted, there will be no need to pre-commercially thin as might be the case if all seedlings germinated from the same seed crop with no inherent advantages. This study is on the verge of yielding good information to address the perceived problem of volunteer stocking in intensively managed loblolly pine stands. The plots are well marked on the ground and the densities, having been rouged twice, are holding except for some low bud sprouting from sapling stumps near the ground. The site should be re-visited and measurements taken, if not annually, then bi-annually until such time that the outcome of the competition can be ascertained. On a second study, fertilized plots were measured after one
growing season in a study to assess correlations between developing crown mass and nutrient needs. Soil samples collected before and after fertilizer application have been analyzed as have seedling measurements of height, ground line diameter, and planting survival. The unfertilized plots showed an uncharacteristically high level of phosphorous, and with the significantly poorer survival, the project outcomes may ultimately prove to be inconclusive. The plots became very droughty during the summer of 2002. Mortality began to appear at significant levels, but more seriously on the unfertilized plots. The seedlings seem to have survived better in the partial shade of the vegetation that developed on the fertilized plots than in the direct sun on the sandy soil of the unfertilized portion. Seedling survival on the fertilized plots averaged 73.5% while the survival on the unfertilized plots averaged 53.5%. The seedling height on the fertilized plots averaged 57.9 cm compared to 43.6 cm on
the unfertilized plots. The ground line diameter of the fertilized seedlings was 1.65 cm while the unfertilized seedlings averaged 1.32 cm.
Impacts
If time reveals that pre-commercial thinning, even at extreme densities, is unnecessary for planted stands to reach commercial pulpwood size in a reasonable time, that assurance will be of value in prescribing subsequent stand treatments. If, on the other hand, the plots show growth stagnation, that information may also be important in stand prescription. In the second study, if tree crown foliage mass can be assessed as a precursor to nutrient needs, field measurements without sophisticated nutrient analyses may offer low cost standard prescriptions.
Publications
- No publications reported this period
|
Progress 01/01/01 to 12/31/01
Outputs
1. Installed research plots with Willamette to measure the early morphological effects of fertilization at the time of site prep. 2. Re-measured the MPEQ (long-term productivity) project plots. 3. Presented paper at the Louisiana Academy of Sciences-Baton Rouge, Louisiana on Louisiana's New Forest.
Impacts
(N/A)
Publications
- NEWBOLD, RAY A, V. CLARK BALDWIN, AND GARY HILL. 2001. Weight and volume determination for planted loblolly pine in North Louisiana. USDA, Forest Service, Southern Research Station, Research Paper SRS-26. 10 p.
- GROOM, LES, Ray NEWBOLD, AND JIM GULDIN. 2002. Effect of silviculture on the yield and quality of veneers. Pages 170-175, In: Outcalt, Kenneth W., ed., Proceedings of the Eleventh Biennial Southern Silvicultural Research Conference Gen. Tech. Rep. SRS-48. Asheville NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 622 p.
- DEAN, THOMAS, J., and R. A. NEWBOLD. 2001. Height Response to Harvesting Intensity and Site Preparation in Four Young Loblolly Pine Plantations. Pages 507-409, In: Outcalt, Kenneth W. ed., Proceedings of the Eleventh Biennial Southern Silvicultural Research Conference, Gen. Tech. Rep. SRS-48. Asheville NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 622 p.
- MILLER, J.H., B.R. ZUTTER, S.M. ZEDAKER, M.B.EDWARDS and R.A. NEWBOLD. 2001 Limits to growth for loblolly pine with vegetation management. WSSA Abstracts, Volume 41. 2001 Meeting of the Weed Science Society of America. Greensboro, NC. February 12-15.
|
|