scholarly journals Mean height or dominant height – what to prefer for modelling the site index of Estonian forests?

2020 ◽  
Vol 72 (1) ◽  
pp. 121-138
Author(s):  
Toomas Tarmu ◽  
Diana Laarmann ◽  
Andres Kiviste
Keyword(s):  
Forest Management ◽  
Management Practice ◽  
Stand Density ◽  
Site Index ◽  
Forest Growth ◽  
Dominant Height ◽  
Forest Management Practice ◽  
Height Change ◽  
The Difference ◽  
Quadratic Mean Diameter

AbstractThe availability of a large amount of data from reliable sources is important for forest growth modelling. A permanent plot where trees are repeatedly measured provides a clearer picture of stand alterations. Various factors, including forest management, affect forest growth and accuracy of its assessment. In Estonia, mean height as a regression height prediction at mean square diameter is commonly used in forest management practice. Alternatively, dominant height can be used. The main advantage of using dominant height instead of mean height is that the growth of dominant trees is not so strongly affected by stand density (thinning). The aim of our research was to investigate the difference between mean height and dominant height when used as stand height. The research was based on the Estonian Network of Forest Research Plots (ENFRP). As a result, we found that the average mean height change was significantly greater in the case of thinning when compared to undisturbed stand development, whereas, the average dominant height change in the case of thinning compared to undisturbed development was less significant. As a side result, we developed a regression model that can be used for calculating the dominant height of the main tree species using stand attributes (mean height, quadratic mean diameter and density) with a residual standard deviation of 0.466 m.

scholarly journals UKURAN DASAR KELESTARIAN PRODUKSI PADA HUTAN RAKYAT DI KABUPATEN BARRU The Standard of Sustainable Production on Private Forest Management in Barru

2019 ◽  
Vol 9 (2) ◽  
pp. 85-92
Author(s):  
Monisari Djamal ◽  
Hardjanto . ◽  
Yulius Hero
Keyword(s):  
Forest Management ◽  
Management Practice ◽  
Land Rights ◽  
Sustainable Production ◽  
Private Forest ◽  
Community Based ◽  
Forest Management Practice ◽  
Change Intensity ◽  
Private Forest Management ◽  
Economic Improvement

Sustainable private forest management is an opportunition sustainable forest development in Indonesia. However, sustainable production of private forest management has not been known, because characteristics of private forest are different with state forest. This research aims to determine a relevant criteria and indicator of sustainable production on private forest management, case of Barru District. This research used descriptive explorative approach and quantitative-qualitative analysis. Criteria and indicator of sustainable production on Indonesia Community Based Forest Management was used as a reference to examine suitability of the standard on private forest management practice. The standards of sustainable production on sustainable private forest management consists of three criteria, namely: (1) sustainability of resources, the indicators were clearly land rights/status and boundaries, land cover change, intensity of planting, maintenance, and harvesting, (2) sustainability of yield, the indicator is infrastructure of forest management, and (3) sustainability of enterprise, the indicators were,market certainty, market accessibility, market information system, and contribution to social and economic improvement for local communities.Keywords: criteria, indicator, private forest, sustainable production.

Algorithmic versions of black spruce stand density management diagrams

1997 ◽  
Vol 73 (2) ◽  
pp. 257-265 ◽  
Author(s):  
P. F. Newton
Keyword(s):  
Black Spruce ◽  
Initial Density ◽  
Basal Area ◽  
Stand Density ◽  
File Transfer ◽  
Quadratic Mean ◽  
Dominant Height ◽  
Yield Production ◽  
Quadratic Mean Diameter ◽  
Stand Density Management

Algorithmic versions of stand density management diagrams (SDMDs) were developed for natural and managed black spruce (Picea mariana (Mill.) B.S.P.) stands. Specifically, the IBM-compatible PC-based algorithms (1) graphically illustrate site-specific size-density trajectories for eight user-specified initial density regimes, (2) given (1), calculate and subsequent tabulate periodic yield estimates (mean dominant height, density, mean volume, total volume, total merchantable volume, quadratic mean diameter, and basal area), and (3) given (2), graphically illustrate empirically-derived yield production curves for total merchantable volume ha−1 and stems m−3 with user-specified operability criteria superimposed. Instructions on acquiring the executable algorithmic versions including the required graphical subroutines via the Internet are described. Currently, the algorithms are restricted in applicability to central insular Newfoundland. Key words: stand density management diagrams, black spruce, algorithms, microcomputer, World-Wide Web (WWW), hypertext browser, file transfer protocol (FTP).

scholarly journals Performance of Dalbergia palo-escrito Rzed. & Guridi-Gómez, a valuable timber tree, in a coffee plantation in Hidalgo, Mexico

2020 ◽  
Vol 344 ◽  
pp. 47-57
Author(s):  
Alfonso SUÁREZ-ISLAS ◽  
Juan CAPULÍN-GRANDE ◽  
José J. MATEO-SÁNCHEZ
Keyword(s):  
Forest Management ◽  
Native Species ◽  
Management Practice ◽  
Height Growth ◽  
Ex Situ ◽  
Diameter Growth ◽  
Coffee Plantation ◽  
Average Growth ◽  
Forest Management Practice ◽  
Timber Tree

As a contribution to ex-situ conservation and production recovery of the valuable timber tree species Dalbergia palo-escrito Rzed. & Guridi-Gómez, enrichment planting was undertaken in a coffee plantation at 830 m above sea level in the east of the State of Hidalgo, Mexico. The purpose of this study was to assess the growth and health status of this species in order to put forward forest management recommendations. Average growth at 11 years of age (n = 56) was as follows: normal diameter, 13.2 ± 2.9 cm; total height, 10.9 ± 1.9 m. These values represent a mean annual increase of 1.2 cm/year in diameter and 1.0 m/year in height. Significant statistical differences in diameter growth (P = 0.0001) and height growth (P = 0.003) were observed as a function of crown position; growth, both in diameter and height, was highest in trees with emergent crowns in comparison with poorly lit trees. An association was also found concerning infestation by Struthanthus sp. mistletoe: differences in diameter growth (P = 0.002) were found between trees with mild infestation in comparison with healthy trees, which showed more growth. On the other hand, no height growth differences were detected (P = 0.102). Diameter and height growth were comparable to other commercially valuable species of fine Dalbergia timber on the international market, such as Dalbergia sissoo in India and Dalbergia retusa in mixed plantations in Costa Rica. The study suggests pruning out the mistletoe as a control strategy is a recommended forest management practice, as well as releasing poorly illuminated trees from competition and preserving the shade canopy of other native species.

scholarly journals Carbon sequestration in community forests: an eligible issue for CDM (A case study of Nainital, India)

1970 ◽  
Vol 15 (2) ◽  
pp. 53-61 ◽  
Author(s):  
R.A. Mandal ◽  
P. Van Laake
Keyword(s):  
Carbon Sequestration ◽  
Forest Management ◽  
Clean Development Mechanism ◽  
Management Practice ◽  
Community Forest Management ◽  
Community Forest ◽  
Area Index ◽  
Community Forests ◽  
Hemispherical Photographs ◽  
Forest Management Practice

Though community forests have a vital role in environmental services and sustainable development in developing countries such as in India and Nepal, the credit cannot yet to be claimed under the Clean Development Mechanism (CDM). It is due to difficulties of assessing the biomass and carbon storage in the community forests for monitoring and verification. However, forest carbon monitoring is possible by the use of advanced technology such as Leaf Area Index (LAI) that is derived from hemispherical photographs using Gap Light Analyser by establishing the relation with the biophysical characteristics of the vegetation. Therefore, the study stepped towards the assessment of carbon sequestration in community forests using LAI. To meet research tasks, which were to establish the relationship between biomass and LAI and explore environmental benefit of community forest management approach, 70 samples from Dhaili and 73 samples from Guna Chautara community forests were collected using stratified random sampling. The sample data included girth, height and canopy photos. Canopy photographs were taken by use of hemispherical cameras. After biomass was estimated using allometric equations, LAI values from canopy photos were analyzed by the use of Gap Light Analyser. Furthermore, for relationship development, the linear regressions analyses were carried out and CDM criteria were incorporated with forest management practice. Main outputs of the research were carbon sequestration model based on LAI and justification of CDM criteria with community forest management practice. Key words: Carbon Sequestration, Leaf Area Index (LAI), Clean Development Mechanism (CDM), Community Forest, Gap Light Analyser, Hemispherical photographs Banko Janakari Vol.15(2) 2005 pp53-61

scholarly journals Wildlife Communities Associated with Even-Aged Reproduction Stands in Two State Forests of Pennsylvania

1999 ◽  
Vol 16 (2) ◽  
pp. 89-95 ◽  
Author(s):  
Leigh Ann Boardman ◽  
Richard H. Yahner
Keyword(s):  
Species Richness ◽  
Forest Management ◽  
Management Practice ◽  
Bird Species ◽  
Ground Level ◽  
Breeding Birds ◽  
Individual Species ◽  
Dense Layer ◽  
Bird Species Richness ◽  
Forest Management Practice

Abstract The effects of even-aged forest management on wildlife have been studied extensively in the northeastern United States. The Pennsylvania Bureau of Forestry recently adopted a new forest management practice termed "even-aged reproduction stands with reservation guidelines," hereafter termed EAR stands, which is intended to replace clearcutting as the primary method of even-aged forest management. We examined wildlife communities (breeding birds and small mammals) in 16 stands (8 EAR stands and 8 reference) in central Pennsylvania from February to October 1995. Species richness and abundances of total birds, foraging guilds, and individual species did not differ (P > 0.05) between large (> 30) and small (< 20 ha) EAR stands. Bird species richness was similar between EAR and reference stands, but abundances of total birds, ground-shrub foragers,common yellowthroats (Geothylpis trichas), and chipping sparrows (Spizella passerina) were significantly higher in EAR than in reference stands. Conversely, abundances of canopy-sallier foragers and red-eyed vireos (Vireo olivaceus) were considerably higher (P < 0.05) in reference than EAR stands. Abundance of the white-footed mouse (Peromyscus leucopus) was significantly (P < 0.01) higher in small compared to large EAR stands but was similar between EAR and reference stands. Because of the concerns about forest fragmentation, we recommend that EAR stands be less than 40 ha in size, which is typical of those created by the Pennsylvania Bureau of Forestry. Overstory trees and snags in EAR stands serve as important substrates for breeding birds. Furthermore, EAR guidelines promote regeneration and growth of a dense layer of vegetation near ground level which is beneficial to wildlife. North. J. Appl. For. 16(2):89-95.

scholarly journals Scientific Forest Management Practice in Nepal: Critical Reflections from Stakeholders’ Perspectives

Forests ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 27 ◽  
Author(s):  
Bishnu Hari Poudyal ◽  
Tek Maraseni ◽  
Geoff Cockfield
Keyword(s):  
Forest Management ◽  
Management Practices ◽  
Sustainable Forest Management ◽  
Management Practice ◽  
Community Forest ◽  
Key Stakeholders ◽  
Forest Management Practice ◽  
The Government ◽  
Forest Users ◽  
Context Specific

Design and application of context-specific forest management practices with the participation of key stakeholders plays a significant role in sustainable forest management outcomes. However, key forestry stakeholders often hold different, and sometimes conflicting, expectations in relation to forest management policies and management objectives. Applying the triple-perspective typology of stakeholder theory, this paper assessed the evolution of “Scientific Forest Management” (SciFM), a signature programme of the Nepalese Government, as well as its policy processes and explored compatibility, complexity, cost and relative advantages of the adoption of SciFM. The government believes that without this programme, Nepal is losing 91 Million US Dollar (USD) per year. This study revealed that participation of key stakeholders remained contested from the beginning of its implementation, primarily due to differences they held in understanding and interpretation of SciFM. Although stakeholders’ views converged on the potential role of SciFM to increase forest product supply and the domination of timber-centric management, their perspectives differed in nomenclature and implementation modality of SciFM. Primarily, the community forest users and their networks did not own the concept from the beginning, as they were suspicious of recentralization and bureaucratic dominance in forest governance through SciFM. Since historically ingrained skepticism in both government officials and community forest users’ networks towards each other has negatively influenced the trust-building environment, the management of stakeholders’ relations through frequent and meaningful deliberations, and the simplification of bureaucratic procedures in implementation and capacity development of key actors could be instrumental in achieving SciFM objectives.

PNIF Owner Attitudes in the Midwest: A Case Study in Missouri and Wisconsin

1988 ◽  
Vol 5 (3) ◽  
pp. 194-197 ◽  
Author(s):  
Timothy D. Marty ◽  
William B. Kurtz ◽  
James H. Gramann
Keyword(s):  
Forest Management ◽  
Program Development ◽  
Regional Differences ◽  
Management Practice ◽  
Timber Management ◽  
Forest Management Practice ◽  
Timber Markets

Abstract Studies in Missouri and Wisconsin reveal that similar owner types exist in each area but the distribution of types varies, possibly in relation to regional differences in timber markets. Land-owner attitudes and associated levels of forest management practice application offer directions for program development and delivery. A broad range of programs will be necessary to engage all PNIF owner types in timber management. North. J. Appl. For. 5:194-197, Sept. 1988.

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