Urban biogeographical analysis of spontaneous tree growth on stone retaining walls
Biogeography ; Hong Kong ; Plant colonization ; Stone wall ; Tree ; Tropical zone ; Urban ecology ; Urban environment ; Vegetation
Stone retaining walls in urban Hong Kong provided vertical habitats for spontaneous colonization by a diversified humid-tropical flora with large trees. A citywide survey assessed wall and tree characteristics to understand wall-tree relationships
and identify conservation candidates. Nonparametric correlations were computed between 28 wall attributes versus tree count, tree biomass, and species-vegetation factors. Most of the 245 walls, with 1275 trees, were in residential areas. Wall height was a key
This paper focuses on the urban biogeographical study of tree quality with regard to habitat conditions that vary mainly by land cover. Statistical analysis, including logistic regression, was used to test the hypothesis that tree performance
is related to extrinsic habitat conditions (planting site, ground cover, land cover, and district) and intrinsic tree traits (species provenance, seasonality, tree dimensions). A total of 6,351 trees were evaluated. District differentiation in tree
performance was related to land cover. Exotic and evergreen species grew better than indigenous and deciduous, offering hints on species-habitat matching. Detailed field and statistical analyses could yield tree-environment information to enhance urban
Satellite-based quantification of tree-dominated pasture degradation stages in north-eastern Pará, Brazil
and carbon models should include a more exact analysis of tree-dominanted pastures to get a more detailed picture of reality. The paper deals with Bragantina, Capoeira, Juquira, pasture degradation, bush encroachment and satellite image classification. - (IfL)
The dendroecological study aims at determining the degree of influence of industrial gases (NOx, SO2, CO, HF) and dusts emissions on the coniferous trees’ (mainly spruces’) growth in the Silesian Beskid, both in temporal and spatial aspect
. The comparison of dated sequences of tree rings with data concerning corresponding industrial emissions will allow delimiting particular zones of intensity and spatial range of influence of the missions. The study will result in temporal and spatial qualification
of the records of industrial impact according to classes of tree rings reductions. - (BJ)
Finnish supra-long tree-ring chronology extended to 5634 BC
Dendrochronological crossdating was used to expand a pre-existing multi-millennial tree-ring chronology for Finnish Lapland. Twelve tree-ring series from sedimentary archives of five small lakes contributed to the oldest part of the chronology
Arkansas ; Forest ; Soil ; Soil properties ; Tornado ; Tree uprooting ; United States of America ; Weathering
between tree root systems, soils, and underlying bedrock. The sites occur within mixed shortleaf pine and hardwood forests. The propensy for tree roots to penetrate bedrock joints, facilitate weathering, and excavate bedrock during uprooting supports
the idea that tree roots play a predominant role in locally deepening soils.
Biogeography ; Ecology ; Maryland ; Pine ; Tree ; United States of America ; Water ; Water budget
This study was conducted to measure and examine the winter leaf conductance and transpiration rates among 10 Pinus strobus trees and investigate whether observed leaf conductance and transpiration rates are large enough to merit incorporation
into existing water balance models. The fieldwork was conducted at the Fair Hill Natural Resources Management Area in north-eastern Maryland. The results suggest that winter leaf conductance of and transpiration from P. strobus trees are significant enough
Braided channel ; Europe ; Holocene ; Landscape dynamics ; Palaeogeography ; Riparian vegetation ; Stream ; Temperate zone ; Tree
, but along natural river corridors both driftwood dynamics and tree reproductive strategies can have a dramatic impact on the style and rate of channel and floodplain development. Therefore, the AA. believe that interpretations of the post-glacial history
of river valleys across the northern temperate climatic zone could be usefully reassessed, incorporating the roles of riparian trees.
Influence of climate and climate anomalies on Norway spruce tree-ring growth at different altitudes and on glacier responses : examples from the Central Italian Alps
The AA. present some examples of the influence of climate and climate anomalies on the alpine environment in the Ortles-Cevedale Group, OCG, focusing on the different responses of Norway spruce tree-ring growth from one OCG valley (the Trafoi Valley
The spatial distribution of the tree species, Colophospermum mopane is mapped at its southern limits in eastern Botswana, using Landsat technology. Its close relationship with soil type is investigated. It is shown that the methods applied prove
The aim of this study was to combine dendrogeomorphological analyses with an assessment of germination dates of successor trees in order to understand the dynamics of past debris-flow events on a forested cone in the Valais Alps, Switzerland
. As a consequence of the deeply incised channel and the stabilization measures undertaken along the banks, signs of debris flows are missing in the tree-ring record for the past two decades.
Beskidy ; Ecotone ; Forest ; Human impact ; Mountain ; Poland ; Tree line
The subject of the article is historical influence of changing forms and intensity of human activities on course, structure, density and dynamics of tree line and field-forest boundary in the High Bieszczady Mountains in the last 150 years. Spatial
Dating the time of root exposure along riverbanks combined with common dendrogeomorphic analysis applied to tree trunks helps to reconstruct the erosion dynamics leading to a potential destabilization of adjoining trees. The advantage of using
A research on the influence of forest associations on the diversification of thermal and humidity conditions of the forest interior was conducted from 2007 to 2008 in six measurement points in the Borecka Forest. The empirical data allowed observing
that in autumn the selected forest associations experience diverse thermal conditions. These differences result mainly from the amount of foliage on the tree tops. - (BJ)