scholarly journals Tree species richness as the element of structure and diversity in mixed stands of beech and valuable broadleaves

2012 ◽  
pp. 157-172
Author(s):  
Branko Stajic ◽  
Milivoj Vuckovic
Keyword(s):  
Species Richness ◽  
Tree Species ◽  
Woody Species ◽  
Forest Stands ◽  
Expected Number ◽  
Mixed Stands ◽  
Species Richness And Diversity ◽  
Number Of Species ◽  
Tree Species Richness ◽  
Ecological Unit

In our forest science and forest operations, the tree species richness and diversity of woody species in forest stands are most often evaluated based on the total number of tree species, which is a methodologically partly inadequate approach. For this reason, the quantification and the evaluation of diversity of woody species in mixed forests of beech with valuable broadleaves in the area of the National Park ?Djerdap? were analyzed by five different indices of tree species richness: number of species (S index), two indices of the species richness (R1 and R2), expected number of species in the sample with equal numbers of trees (E(S84)), and expected number of species in the sample with equal areas (E(S0,25ha)). The results showed that the level of woody species diversity in forest stands depended on the applied index characterizing the tree species richness. It was concluded that the tree species richness and diversity were the highest in the stands of ecological unit B (E(S84)=8.6 species) and in the stands of ecological unit G (E(S0,25ha)=9.4 species), and they were the lowest in the stands of ecological unit V (E(S84)=5.8 species, E(S0,25ha)=5.5 species).

Does the abundance of dominant trees affect diversity of a widespread tropical woodland ecosystem in Tanzania?

2015 ◽  
Vol 31 (4) ◽  
pp. 345-359 ◽  
Author(s):  
Deo D. Shirima ◽  
Ørjan Totland ◽  
Pantaleo K. T. Munishi ◽  
Stein R. Moe
Keyword(s):  
Species Richness ◽  
Relative Abundance ◽  
Tree Species ◽  
Woody Species ◽  
Climatic Conditions ◽  
Miombo Woodlands ◽  
Small Individual ◽  
Tree Species Richness ◽  
Wide Range ◽  
Brachystegia Spiciformis

Abstract:Dominant woody species can determine the structure and composition of a plant community by affecting environmental conditions experienced by other species. We explored how dominant tree species affect the tree species richness, diversity, evenness and vertical structural heterogeneity of non-dominant species in wet and dry miombo woodlands of Tanzania. We sampled 146 plots from eight districts with miombo woodlands, covering a wide range of topographic and climatic conditions. We recorded 217 woody plant species belonging to 48 families and 122 genera. Regression analysis showed significant negative linear associations between tree species richness, relative species profile index of the non-dominant and the relative abundance of the dominant tree species (Brachystegia spiciformis and Brachystegia microphylla in wet, and Brachystegia spiciformis and Julbernardia globiflora in dry miombo woodlands). Shannon diversity and evenness had strong non-linear negative relationships with relative abundance of dominant tree species. A large number of small individual stems from dominant and non-dominant tree species suggesting good regeneration conditions, and intensive competition affecting survival. We suggest that dominant miombo tree species are suppressing the non-dominant miombo tree species, especially in areas with high recruitments, perhaps because of their important adaptive features (extensive root systems and ectomycorrhizal associations), which enhance their ability to access limited nutrients.

scholarly journals The impacts of human activities on tree species richness and diversity in Kakamega Forest, Western Kenya

2014 ◽  
Vol 6 (6) ◽  
pp. 428-435 ◽  
Author(s):  
Esther Vuyiya ◽  
Martha Konje ◽  
Harrison Tsingalia ◽  
Lenard Obiet ◽  
Charles Kigen ◽  
...  
Keyword(s):  
Species Richness ◽  
Tree Species ◽  
Human Activities ◽  
Western Kenya ◽  
Kakamega Forest ◽  
Species Richness And Diversity ◽  
Tree Species Richness

The mechanisms explaining tree species richness and composition are convergent in a megadiverse hotspot

2019 ◽  
Vol 29 (3) ◽  
pp. 799-815
Author(s):  
Victor P. Zwiener ◽  
André A. Padial ◽  
Márcia C. M. Marques
Keyword(s):  
Species Richness ◽  
Tree Species ◽  
Tree Species Richness

scholarly journals Species richness and diversity in shrub savanna using ordinary kriging

2016 ◽  
Vol 51 (8) ◽  
pp. 958-966 ◽  
Author(s):  
Anderson Pedro Bernardina Batista ◽  
José Márcio de Mello ◽  
Marcel Régis Raimundo ◽  
Henrique Ferraço Scolforo ◽  
Aliny Aparecida dos Reis ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Species Richness ◽  
Spatial Dependence ◽  
Ordinary Kriging ◽  
Diversity Index ◽  
Spatial Models ◽  
Shannon Diversity Index ◽  
Shannon Diversity ◽  
Species Richness And Diversity ◽  
Number Of Species

Abstract: The objective of this work was to analyze the spatial distribution and the behavior of species richness and diversity in a shrub savanna fragment, in 2003 and 2014, using ordinary kriging, in the state of Minas Gerais, Brazil. In both evaluation years, the measurements were performed in a fragment with 236.85 hectares, in which individual trees were measured and identified across 40 plots (1,000 m2). Species richness was determined by the total number of species in each plot, and diversity by the Shannon diversity index. For the variogram study, spatial models were fitted and selected. Then, ordinary kriging was applied and the spatial distribution of the assessed variables was described. A strong spatial dependence was observed between species richness and diversity by the Shannon diversity index (<25% spatial dependence degree). Areas of low and high species diversity and richness were found in the shrub savanna fragment. Spatial distribution behavior shows relative stability regarding the number of species and the Shannon diversity index in the evaluated years.

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