Tree composition condition and moments vanishing

Nonlinearity ◽  
2010 ◽  
Vol 23 (7) ◽  
pp. 1651-1673 ◽  
Author(s):  
A Brudnyi ◽  
Y Yomdin
Land ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 470
Author(s):  
Koichi Takenaka ◽  
Kenta Ikazaki ◽  
Saïdou Simporé ◽  
François Kaboré ◽  
Natacha Thiombiano ◽  
...  

Farmed parklands of the Central Plateau, Burkina Faso, integrate native woody vegetation with managed cropland. However, sapling survival in the parklands is increasingly threatened. This study characterized woody vegetation abundance along a 2.7 km long transect in the Doulou Basin, Boulkiemdé Province, Central West Region, to assess changes in vegetation composition since 1984. In addition, a householder survey was conducted to gain insight into tree uses and preferences and residents’ knowledge of regulations. In total, 4999 individuals from 26 tree species were recorded, including 123 individuals (11 species) with stem DBH ≥ 5 cm, and 4876 individuals (21 species) with stem DBH < 5 cm. The three species with the highest importance value index provided fruit for sale or self-consumption. Tree abundance was associated with soil type and topography; highest abundance was on Lixisol soils along the lower transect. Soil degradation and preference changes among residents since 1984 may have influenced tree abundance. Certain beneficial species (e.g., Vitellaria paradoxa) have declined in abundance, and certain exotics (Azadirachta indica and Eucalyptus camaldulensis) have expanded in distribution. Respondents expressed strongest interest in three species, including V. paradoxa, that show high versatility. These results supported the recorded tree composition. The respondents generally understood forest conservation regulations. Dissemination of regreening technology and awareness promotion among residents is essential for sustainable tree use in farmed parklands.


1968 ◽  
Vol 46 (8) ◽  
pp. 1043-1078 ◽  
Author(s):  
J. D. H. Lambert ◽  
P. F. Maycock

A quantitative analysis of the terricolous (ground) lichens in the Northern Conifer – Hardwood forests of central Canada is presented. Seventy-one forest stands were sampled to determine the composition of the tree and lichen strata. Tree composition was expressed in terms of a series of importance values determined from measures of frequency, density, and dominance on a relative basis, with the importance values for all trees in a stand totalling 300. A statistical analysis of lichen distribution showed that while lichens reacted in a similar manner to moisture conditions as the trees they were more commonly found in stands on dry sites. An ordination of stands indicated that optimum environmental conditions for lichen growth were found in dry young conifer stands of low absolute dominance with fairly open canopies, with slowly decomposing ground litter of decidedly acidic reaction.The increase of deciduous tree species in the mesic segments of the moisture gradient produced environmental conditions unsuitable for most of the lichen species recorded. The reduced occurrence of lichens in such sites was interpreted as being related to the lack of suitable substrates, reduction in light intensity at ground level, increased litter, and a more rapid turnover of organic matter.


2020 ◽  
Vol 48 ◽  
pp. 126555
Author(s):  
Welington Kiffer de Freitas ◽  
Luis Mauro Sampaio Magalhães ◽  
Claudio Alexandre Aquino de Santana ◽  
Edson Rodrigues Pereira Junior ◽  
Laís de Castro Machado de Souza ◽  
...  

2013 ◽  
Vol 59 (No. 1) ◽  
pp. 1-7 ◽  
Author(s):  
S. Chauchard ◽  
F. Guibal ◽  
C. Carcaillet

Traditional land use has shaped the Mediterranean region for a long time and has resulted in present-day complex landscapes. The land abandonment dating from the 19<sup>th</sup> century at a site located in the southwestern Alps (France) makes it possible to analyse how present-day forest stands inherit from past land uses. Tree composition and tree age structure were analysed in three stands resulting from different former land uses, i.e. ancient coppice, formerly grazed area and formerly tilled area. The ancient coppice contains the densest tree cover and is dominated by Fagus sylvatica, whereas the formerly ploughed and&nbsp; grazed areas are less dense, both dominated by Pinus sylvestris. Forest stand in the ancient coppice is older than in the formerly grazed area, and forest stand is the youngest in the formerly ploughed area. These stand differences are largely explained by former land use and the abandonment process. Albeit strong changes result from the land abandonment, these landscapes inherit aspects of their land use during the 19<sup>th</sup>century at least and the dynamics does not match the expected pattern of soil fertility. &nbsp;


Nature ◽  
2006 ◽  
Vol 443 (7110) ◽  
pp. 444-447 ◽  
Author(s):  
Hans ter Steege ◽  
Nigel C. A. Pitman ◽  
Oliver L. Phillips ◽  
Jerome Chave ◽  
Daniel Sabatier ◽  
...  

Tropics ◽  
2012 ◽  
Vol 21 (2) ◽  
pp. 33-46 ◽  
Author(s):  
Natsuho Fujisawa ◽  
Motomu Tanaka ◽  
Makoto Inoue

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