Basal-area projection equations for thinned natural even-aged forest stands

1988 ◽  
Vol 18 (7) ◽  
pp. 827-832 ◽  
Author(s):  
Paul A. Murphy ◽  
Robert M. Farrar Jr.
Keyword(s):  
Coastal Plain ◽  
Basal Area ◽  
Shortleaf Pine ◽  
Gulf Coastal Plain ◽  
The West ◽  
General Technique ◽  
Using Data ◽  
Projection Equations ◽  
Better Than

Several existing basal-area projection equations, including one with a thinning term, were compared by using data from a long-term thinning study in natural even-aged stands of loblolly (Pinustaeda L.) and shortleaf pine (Pinusechinata Mill.) in the West Gulf Coastal Plain. The model with the thinning term was no better than existing models with no thinning variable. These results prompted a search to improve the projection models that include thinning. A general technique for introducing a thinning variable into basal-area projection models was developed. This study found that the efficacy of adding a thinning term depends upon the accuracy requirements of the user.

Loblolly Pine Plantation Development is Influenced by Site Preparation and Soils in the West Gulf Coastal Plain

1989 ◽  
Vol 13 (1) ◽  
pp. 17-21 ◽  
Author(s):  
James D. Haywood ◽  
James D. Burton
Keyword(s):  
Loblolly Pine ◽  
Coastal Plain ◽  
Basal Area ◽  
Site Preparation ◽  
Additional Treatment ◽  
Phosphorus Fertilization ◽  
Gulf Coastal Plain ◽  
The West ◽  
Burn Treatment ◽  
Growing Seasons

Abstract Productivity of upland loblolly pine (Pinus taeda L.) plantations was studied under seven site preparation treatments and five soil classes, with and without fertilizer, in the West Gulf Coastal Plain. Generally, the chop-burn-harrow and shear-windrow-harrow treatments resulted in themost basal area (ave. 112 ft²/ac), but the chop-burn-harrow treatment produced the most fiber (2,109 ft³/ac) after 12 growing seasons. Harrowing as an additional treatment after chopping-and-burning increased productivity by 394 ft³/ac over the chop-burn treatment. The leastproductive treatments were underplant-inject and shear-windrow. Generally, basal area per acre was comparatively high on the silty, slowly permeable clay, and very slowly permeable clay soils (ave. 105 ft ²/ac). Two of the soils, silty and slowly permeable clay, had comparatively highvolume production (ave. 1,878 ft³/ac). The least productive sites had gravelly subsoils. Generally, phosphorus fertilization did not influence pine productivity. South. J. Appl. For. 13(1):17-21.

Yield Comparisons from Even-Aged and Uneven-Aged Loblolly-Shortleaf Pine Stands

1988 ◽  
Vol 12 (2) ◽  
pp. 107-114 ◽  
Author(s):  
James M. Guldin ◽  
James B. Baker
Keyword(s):  
Pinus Taeda ◽  
Coastal Plain ◽  
Basal Area ◽  
Selection Method ◽  
Shortleaf Pine ◽  
Large Size ◽  
Intensively Managed ◽  
Pinus Taeda L ◽  
Long Term Studies

Abstract Empirical yields for a 36-year management period are presented for seven long-term studies on similar sites in loblolly-shortleaf pine (Pinus taeda L.-P. echinata Mill.) stands on the upper southern coastal plain of southern Arkansas and northern Louisiana. Total merchantable cubic-foot yields are highest for conventionally managed even-aged plantations; sawtimber cubic-foot yields are highest for intensively managed even-aged plantations and intensively managed uneven-aged stands. However, uneven-aged stands have higher board-foot sawtimber yields than the most productive even-aged stands, particularly in comparisons using the Doyle log rule. It is hypothesized that the even-aged plantations have higher cubic-foot yields because they are more fully stocked with trees of merchantable size. Conversely, the uneven-aged stands have higher board-foot yields because of the greater proportion and continuous supply of sawtimber basal area, especially in stems of large size, which can be developed using the uneven-aged selection method. South J. Appl. For. 12(5):107-114

scholarly journals Long-Term Seedfall, Establishment, Survival, and Growth of Natural and Planted Ponderosa Pine in the Colorado Front Range

2006 ◽  
Vol 21 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Wayne D. Shepperd ◽  
Carleton B. Edminster ◽  
Stephen A. Mata
Keyword(s):  
Ponderosa Pine ◽  
Basal Area ◽  
Colorado Front Range ◽  
Initial Growth ◽  
Front Range ◽  
Natural Seedling ◽  
Survival And Growth ◽  
Seed Crops ◽  
Better Than

Abstract Seedfall, natural regeneration establishment, and growth of planted seedlings was observed from 1981 to 2001 under shelterwood and seedtree overstories in a replicated study in ponderosa pine in the Manitou Experimental Forest in the Colorado Front Range. Good seed crops were produced only every 4 to 6 years, with almost no viable seed produced in intervening years. With seed predation, only 14% of total seedfall was available for germination. Shelterwood overstories containing between 6 and 14 m2 ha−1 stem basal area over scarified seedbeds provided optimal conditions for natural seedling establishment. Survival and growth of planted seedlings was much better than that of natural seedlings. However, poor survival and slow initial growth may require many years to establish a fully stocked forest of natural seedlings.

Group size and nest success in Red-cockaded Woodpeckers in the West Gulf Coastal Plain: helpers make a difference

2004 ◽  
Vol 75 (1) ◽  
pp. 74-78 ◽  
Author(s):  
Richard N. Conner ◽  
Daniel Saenz ◽  
Richard R. Schaefer ◽  
James R. McCormick ◽  
D. Craig Rudolph ◽  
...  
Keyword(s):  
Group Size ◽  
Coastal Plain ◽  
Nest Success ◽  
Gulf Coastal Plain ◽  
The West

Preservational effects in paleoecological studies: Cretaceous mollusc examples

Paleobiology ◽  
1983 ◽  
Vol 9 (1) ◽  
pp. 26-34 ◽  
Author(s):  
Carl F. Koch ◽  
Norman F. Sohl
Keyword(s):  
Coastal Plain ◽  
Time Interval ◽  
Gulf Coastal Plain ◽  
Space And Time ◽  
Assemblage Zone ◽  
Using Data ◽  
High Diversity ◽  
Species Longevity

The effect of preservational quality on paleoecologic studies is evaluated quantitatively by using data from 83 fossil collections. These collections are from a restricted Cretaceous time interval (Haustator bilira Assemblage Zone) of Maestrichtian Age and are from the Eastern Gulf Coastal Plain Province. In all, 32,335 specimens were identified, resulting in recognition of 643 different taxa. Each collection was categorized into one of six preservational types, ranging from those in which both aragonite and calcite shells are well preserved to those having only calcite shells preserved.Statistical comparisons reveal that preservation affects the faunal makeup of these collections. Specifically, collections in which both aragonite and calcite are well preserved have more taxa than collections of poorer preservational quality and contain faunal elements not found in other collections.These two effects can confound paleoecologic studies of endemism, eurytopy vs. stenotopy, species longevity and other studies of the distribution of organisms in space and time. These effects are especially significant for studies based on presence/absence data, such as published faunal lists and selectively collected samples. In such studies, collections of good preservational quality may be interpreted to represent strata of high diversity, taxa having the more durable hard parts will appear to be widespread and long ranging, and taxa that are preserved only in collections of the best preservational quality will appear stenotopic, endemic, and rare.

scholarly journals Does Row Orientation Affect the Growth of Loblolly Pine Plantations?

2009 ◽  
Vol 33 (2) ◽  
pp. 77-80 ◽  
Author(s):  
Ralph L. Amateis ◽  
Harold E. Burkhart ◽  
Colleen A. Carlson
Keyword(s):  
North Carolina ◽  
Loblolly Pine ◽  
Coastal Plain ◽  
Basal Area ◽  
Analysis Of Covariance ◽  
Growth Data ◽  
Dominant Height Growth ◽  
Crown Closure ◽  
Selection Of

Abstract Analysis of covariance methods applied to long-term loblolly pine spacing trial growth data showed that the orientation of rows with regard to a particular azimuth direction had no significant impact on either basal area or dominant height growth through the age of 20 years. Results were consistent for a range of planting densities and spacings and across a range of ages that included very young ages before crown closure. These results suggest that for loblolly pine growing in the Piedmont and Coastal Plain areas of Virginia and North Carolina, the selection of row orientation at plantation establishment can be made based on criteria other than growth.

Sign in / Sign up

Export Citation Format

Share Document