Tree allometry, leaf size and adult tree size in old-growth forests of western Oregon

1991 ◽  
Vol 9 (3) ◽  
pp. 369-381 ◽  
Author(s):  
D. A. King
Keyword(s):  
Leaf Size ◽  
Tree Size ◽  
Old Growth ◽  
Tree Allometry ◽  
Old Growth Forests ◽  
Adult Tree

scholarly journals Structural Diversity of Tree Stems of Elephant Camp Natural Forest in Omo Forest Reserve

2020 ◽  
Vol 3 (1) ◽  
pp. 75
Author(s):  
Oladele Fisayo Falade ◽  
Janet Ugochukwu Iheke
Keyword(s):  
Species Diversity ◽  
Structural Diversity ◽  
Natural Forest ◽  
Tree Size ◽  
Coefficient Of Determination ◽  
Resource Utilisation ◽  
Stem Density ◽  
Old Growth ◽  
Forest Reserve ◽  
Old Growth Forests

Tree size diversity is an indicator of biodiversity values of a forest. Microsite conditions of a forest determine the survival and growth of trees. However, the contribution of variable habitats to tree size hierarchy and segregation is poorly understood. Tree size variation in a population is caused by different competition mechanisms. Therefore, the size distribution and spatial pattern of trees can identify the process governing resource utilisation in the forest. The objective of the study was to investigate the tree stem structural diversity in the Elephant Camp natural forest in the Omo Forest Reserve. Three and four 0.09 ha sample plots were established in Riparian (RF) and Old-growth forests (OF) in the Elephant Camp natural forest, respectively. The tree stems (Dbh ≥ 5cm) were identified to the species level and enumerated within each plot, and the stem density was computed. The diameter at breast height (Dbh) was measured with diameter tape. Species diversity was assessed using Shannon–Weiner (H’) and Simpson indices (1-D’), while size inequality was assessed using the Gini coefficient (GC), coefficient of variation (CV), H’ and I-D’. The performance of single two- and three-parameter Weibull models was evaluated using Kolmogorov–Smirnov (K-S) chi-square (χ2), root-mean-square error (RMSE), bias and the coefficient of determination (R2). Data were analysed using descriptive statistics. A total of 27 and 24 tree species were identified in RF and OF, respectively. The stem density of RF was significantly higher than that of OF. The values of species diversity (H’, 1-D’) and evenness (E’) were higher in OF than in RF, while richness (Margalef and number of species) was higher in RF than in OF. The Dbh was 38.30 ± 21.4 and 42.87 ± 19.2 cm in Riparian and Old-growth forests, respectively. Size-density distributions of both forests were positively skewed and expressed exponential pattern. The forest types of the Elephant Camp natural forest comprise the same size-density frequency shape but a different proportion of tree sizes and structural diversities.

scholarly journals Broad-Scale Classification and Mapping of Tree Size and Density Attributes in Productive Old-Growth Forests in Southeast Alaska's Tongass National Forest

2008 ◽  
Vol 23 (2) ◽  
pp. 106-112 ◽  
Author(s):  
John P. Caouette ◽  
Eugene J. DeGayner
Keyword(s):  
Forest Management ◽  
Tree Size ◽  
National Forest ◽  
Forest Types ◽  
Old Growth ◽  
Density Mapping ◽  
Old Growth Forest ◽  
Tongass National Forest ◽  
Old Growth Forests ◽  
Mapping Models

Abstract The forest classification and mapping system currently used in managing the Tongass National Forest (NF) is based largely on an economic forest measure, net board foot volume per acre. Although useful for timber economic modeling, this forest measure poorly differentiates old-growth forest types in a way that is meaningful to ecological and social concerns. In 2005, we published an article presenting a proposed tree size and tree density mapping model for the Tongass NF. We claimed the model would provide better information on the structural patterns in old-growth forests than did the current mapping models based on net board foot volume per acre. We also stated that further testing of our proposed model is required before it can be fully integrated into forest management plans and landscape analysis. In this article, we used independent field data to evaluate our proposed tree size and density model and better define its accuracy. Results showed differences among mapping classes similar to differences observed in the development stages of the model. Results also showed mapping accuracy estimates between 60 and 80%. We used the model in a forest management application by comparing the representation of old-growth forest types within a landscape to the representation within a management-defined subset of that landscape.

Pattern and dynamics of biomass stock in old growth forests: The role of habitat and tree size

2016 ◽  
Vol 75 ◽  
pp. 15-23 ◽  
Author(s):  
Zuoqiang Yuan ◽  
Antonio Gazol ◽  
Xugao Wang ◽  
Fei Lin ◽  
Ji Ye ◽  
...  
Keyword(s):  
Tree Size ◽  
Old Growth ◽  
Old Growth Forests

Northwest Forest Plan–the first 15 years (1994–2008): status and trends of late-successional and old-growth forests

2011 ◽  
Author(s):  
Melinda Moeur ◽  
Janet L. Ohmann ◽  
Robert E. Kennedy ◽  
Warren B. Cohen ◽  
Matthew J. Gregory ◽  
...  
Keyword(s):  
Old Growth ◽  
Status And Trends ◽  
Old Growth Forests ◽  
Northwest Forest Plan

Alternatives to clearcutting in the old-growth forests of southeast Alaska: study plan and establishment report.

2000 ◽  
Author(s):  
Michael H. McClellan ◽  
Douglas N. Swanston ◽  
Paul E. Hennon ◽  
Robert L. Deal ◽  
Toni L. de Santo ◽  
...  
Keyword(s):  
Old Growth ◽  
Southeast Alaska ◽  
Old Growth Forests ◽  
Study Plan

scholarly journals Our New Cathedrals: Spirituality and Old-Growth Forests in Western Australia

2006 ◽  
Vol 3 (1) ◽  
Author(s):  
David Worth
Keyword(s):  
Social Movements ◽  
Western Australia ◽  
The State ◽  
The South ◽  
Old Growth ◽  
The Past ◽  
South West ◽  
Old Growth Forests ◽  
Heated Debate ◽  
Policy Proposals

Over the past 30 years in Western Australia (WA), there has been heated debate about the future use of the remaining karri and jarrah forests in the south-west of the State. This debate revolves around policy proposals from two social movements: one wants to preserve as much of the remaining old-growth forests as possible, and an opposing movement supports a continued

Gender-related distributions of Fraxinus mandshurica in secondary and old-growth forests

2010 ◽  
Vol 36 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Chunyu Zhang ◽  
Xiuhai Zhao ◽  
Lushuang Gao ◽  
Klaus von Gadow
Keyword(s):  
Fraxinus Mandshurica ◽  
Old Growth ◽  
Old Growth Forests
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