scholarly journals Modelling vegetation management treatments with the Tree and Stand Simulator

2008 ◽  
Vol 84 (1) ◽  
pp. 53-59 ◽  
Author(s):  
George J. Harper ◽  
Ken Polsson ◽  
Jim Goudie
Keyword(s):  
Pseudotsuga Menziesii ◽  
Vegetation Management ◽  
Growth And Yield ◽  
Picea Engelmannii ◽  
Annual Increment ◽  
Engelmann Spruce ◽  
Tree Survival ◽  
Treatment Data ◽  
Rotation Age ◽  
Mean Annual Increment

The Tree and Stand Simulator (TASS) has been used for over 20 years in British Columbia to generate yield tables for managed stands. In order to explore the impacts of weed control on site productivity we chose two vegetation management research trials where 10- to 15-year post-treatment data were available (Boston Bar and Mica research sites). Tree survival and height growth results were used to adjust the TASS input parameters to simulate the various brushing treatments. At the Boston Bar site, all vegetation reduction treatments shortened the Douglas-fir (Pseudotsuga menziesii var. glauca [Beissn.] Franco) physical rotation age by up to 10 years and culmination mean annual increment (cMAI) was increased 8% to 11% relative to the untreated control. At the Mica site, the glyphosate and all repeated manual cutting treatments resulted in a shortening of the Engelmann spruce (Picea engelmannii Parry) rotation age by seven years and increased cMAI by approximately 11% to12%. Key words: growth and yield modelling, vegetation management, Pseudotsuga menziesii, Picea engelmannii

scholarly journals Growth and Yield Relative to Competition for Loblolly Pine Plantations to Midrotation—A Southeastern United States Regional Study

2003 ◽  
Vol 27 (4) ◽  
pp. 237-252 ◽  
Author(s):  
James H. Miller ◽  
Bruce R. Zutter ◽  
Shepard M. Zedaker ◽  
M. Boyd Edwards ◽  
Ray A. Newbold
Keyword(s):  
Loblolly Pine ◽  
Basal Area ◽  
Pine Plantations ◽  
Growth And Yield ◽  
Regional Study ◽  
Annual Increment ◽  
Complete Control ◽  
High Severity ◽  
Pinus Taeda L ◽  
Mean Annual Increment

Abstract Loblolly pine (Pinus taeda L.) plantations were studied across 13 southeastern sites grown for 15 yr with near-complete control of woody, herbaceous, and woody plus herbaceous components during the first 3–5 yr. This multiple objective experiment (the COMProject) documents stand dynamics at the extreme corners of the response surface that encompasses most competition conditions common to pine plantations. This is the second of two companion reports. Merchantable pine volume after 15 yr with early, near complete competition control reached 2,350–4,415 ft3/ac by site compared to 1,132–2,965 ft3/ac on the no controls. With control of both woody and herbaceous competition, 15 yr volumes were increased by 23–121% and gains increased as hardwoods and shrubs increased on the no controls. Early woody control increased merchantable pine volume on 11 sites by 14–118%, while herbaceous control yielded somewhat less on average, a 17–50% increase on ten sites. No gains and some volume losses occurred when control of one component released severe competition from an enhanced remaining component, otherwise gains were generally additive for control of both components. Pine volume was decreased by about 1% for each 1 ft2/ac of hardwood basal area (BA) present at age 15. Annual measurements determined that culmination of current annual increment (CAI) with control of both competition components occurred in yr 8–11 at 250–470 ft3/ac/yr. CAIs for pine height, BA, and volume were decreased by about 5–27% when growing season rainfall (March–October) was less than 36 in. Mean annual increment had not culminated for any treatment at any location by yr 15 and ranged from 195–250 ft3/ac/yr with both woody and herbaceous control. Fusiform rust mainstem galls [Cronartium quercuum (Berk.) Miyabe ex Shirai f. sp. fusiforme (Hedge. & Hunt) Burdsall & Snow] in high severity areas increased additively with control of both components, more so with herb control. Contrary to the widespread assumption that hardwood out-compete pine, the hardwood proportion of stand BA decreased from yr 5–15 on sites where hardwood BA in yr 5 exceeded 10 ft2. South. J. Appl. For. 27(4):237–252.

scholarly journals Eucalyptus for Low Elevation Foothill Plantations in California

1997 ◽  
Vol 12 (4) ◽  
pp. 104-107
Author(s):  
John W. LeBlanc ◽  
Janine K. Hasey ◽  
Richard B. Standiford ◽  
Mike Connor ◽  
Roy M. Sachs
Keyword(s):  
Sierra Nevada ◽  
Hybrid Poplar ◽  
Annual Increment ◽  
Culture Techniques ◽  
Short Rotation ◽  
Hardwood Trees ◽  
Sierra Nevada Foothills ◽  
Rotation Age ◽  
Intensively Managed ◽  
Mean Annual Increment

Abstract In March 1984 we established a test plantation of selected Eucalyptus and poplar seedlings species and clones on a range site in the Sierra Nevada foothills. The main objectives were to evaluate survival and growth of the various species and clones and to determine a rotation age for intensively managed hardwood trees grown under low elevation foothill conditions. Seedlings and clones of six species of Eucalyptus and one hybrid poplar were grown with short rotation intensive culture techniques for 7 yr. Rotation age, defined as the culmination of mean annual increment, varied from 3 to 6 yr. The best producing clone produced 8 cords of fuelwood per acre per year. The potential for damage from freezing and snow at these elevations is also discussed. West. J. Appl. For. 12(4):104-107.

50 years of low thinning in second growth Douglas-fir

1999 ◽  
Vol 75 (3) ◽  
pp. 401-405 ◽  
Author(s):  
Steven D. Stinson
Keyword(s):  
Wood Quality ◽  
Quality Characteristics ◽  
Growth And Yield ◽  
Annual Increment ◽  
Key Words Growth ◽  
Volume Yield ◽  
Second Growth ◽  
Western Washington ◽  
Mean Annual Increment ◽  
Different Levels

This paper presents the Port Blakely XT series, established in western Washington in the period 1948–1958. XT-1, 2 and 3 were designed to evaluate effects of repeated low thinning and extended harvest rotations. XT-7 compares the effects of different levels of removal on standing volume and wood quality.Periodic and mean annual increment trends have been examined for all four trials. Results from these trials indicate the extension of culmination of mean annual increment due to low thinning combined with extended rotations. Volume yield is reported for XT-1 and XT-2. The thinned plots reveal an increase in bole size and an increase in total harvested volume. Wood quality characteristics were measured in XT-1 and 7, evaluated for differences between thinned and non-thinned and compared to stands harvested at younger ages. Results indicate that extended rotations and low thinning increase the quantity of structural log grades when compared to stands harvested on shorter rotations.Such regimes should reduce conflicts between timber production and other values such as watershed, wildlife, and aesthetics and are particularly applicable to public ownership. Key words: growth and yield, mean annual increment, wood quality, alternative silviculture, extended rotations, low thinning

Yield Comparison of Three Douglas-Fir Plantations on Former Farmland in Western Washington

1990 ◽  
Vol 5 (4) ◽  
pp. 123-126
Author(s):  
Marshall D. Murray ◽  
Constance A. Harrington
Keyword(s):  
Pseudotsuga Menziesii ◽  
Nutrient Availability ◽  
Site Index ◽  
Douglas Fir ◽  
Annual Increment ◽  
Volume Yield ◽  
Western Washington ◽  
Natural Stands ◽  
Mean Annual Increment ◽  
Enhanced Yield

Abstract Yields of three Douglas-fir (Pseudotsuga menziesii) plantations on former farmland were substantially greater than DFSIM yields for the plantations based on site index estimates from adjacent natural stands. Volume yield per acre of trees 1.6 in. dbh and larger was 40 to 57% greater in the actual plantations than in the simulations. For trees 7.6 in. dbh and larger, volume yield of the actual plantations was 85 to 151% greater than the simulated yields. Mean annual increment of the actual plantations was 56 to 69% greater than the simulated values. In addition, top height was greater in two of the plantations than predicted. Running a second set of simulations with site index estimates based on plantation trees reduced the discrepancy in yields but still resulted in substantial underpredictions. Some possible reasons for enhanced yield of the plantations on former farmland are greater site uniformity, reduced vegetative competition, and increased nutrient availability. West. J. Appl. For. 5(4):00-00, October 1990.

scholarly journals Effect of Spacing Regimes on Growth, Yield, and Wood Properties ofTectona grandisat Longuza Forest Plantation, Tanzania

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Eliakimu Zahabu ◽  
Tumaini Raphael ◽  
Shabani Athumani Omari Chamshama ◽  
Said Iddi ◽  
Rogers Ernest Malimbwi
Keyword(s):  
Basic Density ◽  
Growth Yield ◽  
Basal Area ◽  
Wood Properties ◽  
Modulus Of Rupture ◽  
Forest Plantation ◽  
Annual Increment ◽  
Volume Production ◽  
Rotation Age ◽  
Mean Annual Increment

This study examined the effects of planting spacing on growth, yield, and wood properties of teak planted at square spacing regimes of 2 m, 3 m, and 4 m at Longuza Forest Plantation, Tanzania. To achieve this, tree, stand, and wood properties were studied at age of 14 years. Results showed that diameter at breast height and total height increased with increasing spacing. Mean annual increment increased significantly with increasing spacing while spacing did not have significant effect on total volume production and basal area. Basic density is also not affected by spacing while heartwood proportion increases as planting spacing increases. All studied wood properties (modulus of rupture, modulus of elasticity, compression strength tangential to grain, and shear tangential to the grain) except cleavage tangential to grain were not significantly affected by increasing spacing. It is recommended to use the spacing of 3 × 3 m, but if thinning can be done before onset of competition at 5 years, the currently used spacing of 2.5 × 2.5 m can still be used. However, the use of a spacing of 4 × 4 m can give at least 50% heartwood at shorter rotation age of 30 years.

Fifteen Years of Cottonwood Plantation Growth and Yield

1980 ◽  
Vol 4 (4) ◽  
pp. 180-185 ◽  
Author(s):  
R. M. Krinard ◽  
R. L. Johnson
Keyword(s):  
Populus Deltoides ◽  
Growth And Yield ◽  
Annual Increment ◽  
Volume Increment ◽  
Mean Annual Increment

Abstract At age 15, unthinned cottonwood (Populus deltoides Bartr.) planted at four spacings ranged from 7.5 to 12.1 inches average d.b.h. Initial spacings were 4' x 9', 8' x 9', 12' x 12', and 16' x 18' on Commerce-Convent soils. Mean annual cubic-foot volume increment by spacings in trees ≥5.0 inches d.b.h. peaked from year 9 to 13 and ranged from 277 to 313 cubic feet per acre per year. Yields from three thinning treatments did not exceed unthinned mean annual increments for a given spacing. Board-foot mean annual increment in trees ≥12.0 inches d.b.h. to a 10-inch top ranged from 60 to 370 board feet per acre for unthinned plots and from 100 to 420 board feet per acre for thinned plots when averaged over spacings.

scholarly journals Volume Growth Trends in a Douglas-Fir Levels-of-Growing-Stock Study

2006 ◽  
Vol 21 (2) ◽  
pp. 79-86 ◽  
Author(s):  
Robert O. Curtis
Keyword(s):  
Volume Growth ◽  
Douglas Fir ◽  
Growth And Yield ◽  
Annual Increment ◽  
Growing Stock ◽  
Average Maximum ◽  
Volume Production ◽  
Mean Annual Increment ◽  
Single Set ◽  
Related Mortality

Abstract Mean curves of increment and yield in gross total cubic volume and net merchantable cubic volume were derived from seven installations of the regional cooperative Levels-of-Growing-Stock Study (LOGS) in Douglas-fir. The technique used reduces the seven curves for each treatment for each variable of interest to a single set of readily interpretable mean curves. To a top height of 100 ft and corresponding average age of 45 years, volume growth and yield are strongly related to stocking level, being highest at the highest stocking levels. At that point, current annual increment is still far greater than mean annual increment. Thinning has accelerated diameter growth of the largest 40 trees per acre as well as of the stand average. Maximum volume production would be obtained at stand relative densities approaching the zone of competition-related mortality, although in practice considerations of feasibility of frequent entries and wildlife and amenity considerations would make somewhat lower average levels necessary.

An Interactive Thinning Simulation for Red Pine Stands

1995 ◽  
Vol 12 (1) ◽  
pp. 43-48
Author(s):  
Dietmar W. Rose ◽  
Chug Muh Chen
Keyword(s):  
Dynamic Programming Algorithm ◽  
Basal Area ◽  
Red Pine ◽  
Programming Algorithm ◽  
Annual Increment ◽  
Volume Production ◽  
Lake States ◽  
Pine Stands ◽  
Rotation Age ◽  
Mean Annual Increment

Abstract This paper describes a computer program, REDPTHIN, that permits the development of optimal thinning schedules for red pine plantations in the Lake States. The optimal schedules maximize total cubic foot volume production for any initial stand condition of age, site, and basal area stocking. These optimal schedules are derived via a special dynamic programming algorithm that the author developed. User specified thinning schedules can be simulated. Optimal biological rotation age and mean annual increment can be derived from the output table. North. J. Appl. For. 12(1):43-48.

scholarly journals ANALISIS PERTUMBUHAN DAN HASIL TANAMAN SUNGKAI (Peronema canescens Jack.) DI KALIMANTAN

2017 ◽  
Vol 2 (2) ◽  
pp. 116
Author(s):  
Wahyudi Wahyudi ◽  
Zainal Muttaqin ◽  
A. Russel Mojiol
Keyword(s):  
Net Present Value ◽  
Financial Analysis ◽  
Growth And Yield ◽  
Cost Ratio ◽  
Good Prospect ◽  
Present Value ◽  
Annual Increment ◽  
Bank Rate ◽  
Equation Modelling ◽  
Mean Annual Increment

Growth and Yield Analysis of Peronema canescens Jack. in Kalimantan          Sungkai (Peronema canescens) is a native and local species and one of some commercial trees which has a good prospect to be developed in timber estate in Kalimantan.This research was aimed to analyse sungkai plantation, neither the living percentage, productivity, economic cutting cycle, and also its profit. The data analysis was using the average of trees diameter, high and volume, mean annual increment, polynomial equation modelling and financial analysis i.e. net present value (NPV), benefit cost ratio (BCR) and internal rate of return (IRR). The research had been conducted at the community plantation in Kapuas District, Central Kalimantan Province since 1998 to 2010.  The result of this research showed that living trees precentage at 12 years old was 89.7%, mean annual increment and its density were 10,14 m3 ha-1  and 997 tree/ha respectively. Equation modelling of sungkai plantation was y = 2,073 + 1,6623x - 0,0165x2 (R2= 84,05%). In the bank rate of 9% per year, the economic cutting cycle of this plantation was 15 years with net present value was NPV 58,49 million per ha. BCR 7,64 and IRR 11,75 If the bank rate of 6% and 12% per year, then net present value at the 15 years were NPV 92.65 and 36.6 million per ha respectively. The sangtein was suitable as timber estate and to increase the productivity of former shifting cultivation, scru, and low potential forests which were widespread, especially in Kalimantan.Keywords :  Growth and yield, mean annual increment, Peronema canescens, economic cutting cycle ABSTRAK        Sungkai adalah jenis tanaman komersial lokal dan asli yang mempunyai prospek baik untuk dikembangkan dalam hutan tanaman Kalimantan. Penelitian ini bertujuan untuk mengetahui prosen hidup, produktivitas, siklus tebang optimum, dan keuntungan finansial dari tanaman sungkai. Penelitian dilakukan di hutan tanaman rakyat, Kabupaten Kapuas Provinsi Kalimantan Tengah. Obyek penelitian ialah tanaman sungkai yang ditanam sejak tahun 1998 pada tipe tanah Ultisol. Analisis data menggunakan nilai rataan diameter, tinggi dan volume, riap tahunan rata-rata tahunan, persamaan regresi, NPV, BCR dan IRR. Hasil penelitian menunjukkan bahwa pada umur 12 tahun prosen hidup tanaman mencapai 89,7 %, riap tahunan rata-rata 10,14 m3 ha-1 year-1 dengan kerapatan 997 pohon/ha. Model pertumbuhan tanaman sungkai ialah y = 2,073 + 1,6623x - 0,0165x2 (R2= 84,05%). Pada tingkat suku bunga pinjaman 9% per tahun, tanaman sungkai mempunyai siklus tebang ekonomi selama 15 tahun dengan nilai NPV Rp. 58,49 juta/ha, BCR: 7,64 dan IRR: 11,75%. Pada tingkat suku bunga pinjaman 6% dan 12% per tahun, maka pada siklus tebang selama 15 tahun, nilai NPVnya masing – masing menjadi Rp. 92,65 juta/ha dan Rp. 36,6 juta/ha. Tanaman sungkai sangat sesuai dikembangkan dalam hutan tanaman dan untuk meningkatkan produktivitas lahan bekas perladangan berpindah, semak belukar dan hutan potensi rendah yang tersebar luas, khususnya di Kalimantan.Kata kunci : Pertumbuhan dan hasil, riap tahunan rata – rata, Peronema canescens, siklus tebang ekonomi

scholarly journals ANALISIS PERTUMBUHAN DAN HASIL TANAMAN JABON (Anthocephallus cadamba)

PERENNIAL ◽  
2012 ◽  
Vol 8 (1) ◽  
pp. 19
Author(s):  
. Wahyudi
Keyword(s):  
Shifting Cultivation ◽  
Net Present Value ◽  
Growth And Yield ◽  
Cost Ratio ◽  
Good Prospect ◽  
Present Value ◽  
Annual Increment ◽  
Bank Rate ◽  
Equation Modelling ◽  
Mean Annual Increment

Anthocephallus cadamba was a native species and one of some commercial trees which had a good prospect to develop on the low production forest. This research was aimed to analyze growth and yield of A. cadamba plantation, including the living trees percentage, productivity, economic cutting cycle, and its profit. Parameter of data analysis used trees diameter, high and volume, mean annual increment, polynomial equation modelling and financial analysis i.e. net present value (NPV), and benefit cost ratio (BCR). The research had been conducted at research plots of A. cadamba in sub District of Mandau Talawang, Central Kalimantan Province since 1998 to 2010. Soil type in the site was ultisol former shifting cultivation and scrubs. The result of this research showed that living trees precentage at 12 years old was 57.7 %. Mean annual increment and its density were 19.05 m3 ha-1 and 641 tree ha-1 respectively. Equation modelling of jabon plantation was y = 4.7814 + 3.6028x - 0.185x2 (R2= 63.34 %). In the bank rate of 9 % year-1, the economic cutting cycle of this plantation was 13 years with net present value was IDR 72,79 million per ha. If the bank rate of 6 % and 12 % per year, then net present value at the 13 years were IDR 108.52 and IDR 48.56 million ha-1 respectively. The A. cadamba was suitable to timber estate and to increase the productivity of former shifting cultivation, scrub, and low potential forest areas. Key words: growth and yield, mean annual increment, Anthocephallus cadamba, economic cutting cycle

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