Spatial patterns and structure of the mountain birch tree-limit in the southern Swedish Scandes - a regional perspective
Aeolian deflation ; Biogeography ; Ecotone ; Geo-ecology ; Microrelief ; Mountain ; Regression analysis ; Slope gradient ; Snow ; Spatial variation ; Sweden ; Tree line
This study improves the understanding of the tree-limit phenomenon in general by identifying and analysing regional spatial patterns of the present-day tree-limit position (m a.s.l.) and structure of mountain birch along relevant topographical
Spatial clusters and variability analysis of tree mortality
Biogeography ; Cluster analysis ; Forest ; Geographical information system ; Georgia (USA) ; Inventory ; Mortality ; Spatial analysis ; Sustainable development ; Tree ; United States of America
The AA. focus on the spatial cluster characteristics of forest tree mortality in the state of Georgia by using permanent plot data from the 1989 and 1997 FIA inventories, spatial scan statistic and semivariogram analysis methods, and geographic
information system (GIS) techniques. Eight kinds of tree damage, possibly combined with other kinds damage.
Latitudinal range variation of trees in the United States : a reanalysis of the applicability of Rapoport's rule
Biogeography ; Conifer ; Latitude ; Leafy ; Southern United States ; Spatial distribution ; Taxonomy ; Theory ; Tree ; United States of America ; Vegetation
This study aims to reassess the applicability of Rapoport's rule to U.S. tree species : a pattern of increasing latitudinal range sizes for organisms with increasing latitude. Data presented here suggest that tree range patterns consistent
Fluvial process and the establishment of bottomland trees
Flood ; Hydraulic works ; Meander ; Missouri ; Montana ; Spatial variation ; Stream ; Tree ; United States of America ; Vegetation
The effects of river regulation on bottomland tree communities in western North America have generated substantial concern because of the important habitat and aesthetic values of these communities. Consideration of such effects in water management
decisions has been hampered by the apparent varaibility of responses of bottomland tree communities to flow alteration. When the relation between streamflow and tree establishment is placed in a geomorphic context, however, much of that variability
is explained, and prediction of changes in tree community is improved.
Tree-ring analysis and Quaternary geology: principles and recent applications
This paper presents a review of recent advances and applications in the field of dendrogeomorphology over the last decades. Emphasis here is placed on those applications that utilize tree-ring chronologies to extract information on the timing
and extent of past geomorphic changes. Examples are presented to illustrate how trees record Quaternary events, to emphasize the importance of tree-ring crossdating in the determination of precise calendar dates of events and, to show the utility of tree
[b1] Tree-ring Laboratory, Lamont-Doherty Earth Observatory, Palisades, NY 1096, Etats-Unis
Tree-ring δD as an indicator of asian monsoon intensity
Questions have been raised as to whether the isotopic composition of meteoric water can be used to reconstruct paleomonsoon intensity. Tree rings of two modern spruce trees were analyzed for hydrogen isotopic composition. On average, the older tree
is depleted in deuterium compared to the modern trees. The AA. attribute this isotopic depletion to the strength of summer monsoons, which were more intense in the early Holocene than at present. Although this study is not definitive, it suggests
Early Holocene tree growth at a high elevation site in the northernmost Scandes of Sweden (Lapland) : a palaeobiogeographical case stduy based on megafossil evidence
C 14 dating ; Holocene ; Lapland ; Methodology ; Palaeobiogeography ; Palaeoclimate ; Palynology ; Sweden ; Tree line
This paper focuses on early Holocene tree growth and alpine tree-limits in the northernmost Swedish Scandes. Megafossil wood remnants in peats and lakes were searched for over a large area at elevations high above the modern tree-limits. The results
Influence of phenotypic plasticity in photosynthetic functions on the spatial distributions of tropical trees
The A. presents the case that plasticity in functional phenotypes might be studied for more rapid gain in understanding of biogeographical distribution of tropical trees. First, he presents simple theoretical logic that trees and tropical tree
presents a cross-disciplinary approach to examining functional characters in trees that could provide meaningful insights into species'spatial distribution despite these obstacles.
Tree-limit landscape evolution at the southern fringe of the Swedish Scandes (Dalarna province) - Holocene and 20th century perspectives
Birch ; C 14 dating ; Climatic change ; Climatic warming ; Environment ; Forest ; Holocene ; Palaeo-ecology ; Phytogeography ; Pine ; Spruce ; Sweden ; Tree line ; Twentieth Century
The long-term history relies mainly on radiocarbon-dated megafossil tree remains preserved in peat and mineral soil. The more recent perspective was analysed from age distributions in the most marginal, extant tree populations. Results about
Holocene and Modern tree-limit evolution are presented : species-limit positions (Pinus sylvestris, Picea abies, Betula pubescens) at 4 study sites in 1915, 1975, 2003. Thus, 20th century warming and associated biological consequences in the study area fit
Tree uprooting : review of types and patterns of soil disturbance
This paper reviews the formation and longevity of pit and mound microtopography formed by tree uprooting, and examines the importance of this process to mass wasting and soil genesis. This paper focuses on the physical environment, concentrating
Oxygen isotope ratios from tree rings containing compression wood
During studies of oxygen isotope : temperature relationships for tree rings in the Canadian Rockies, the AA. noted differences in oxygen isotope ratios between samples from compression wood and normal radii in the same stem. This paper briefly
Climatic fluctuations in northern Patagonia during the last 1 000 years as inferred from tree-ring records
A multiple regression model is used to reconstruct summer temperature departures in northern Patagonia on the basis of tree-ring data. Finally, the temperature reconstruction is compared with other proxy records of climatic variation in Patagonia
Strontium isotopes in trees as an indicator for calcium availability
Preliminary analyses of water (precipitation, throughfall, runoff, soil-water), soil (mineral matter) and biological material (trees, musselshells) show that the use of the strontium isotope ratio 87 Sr/86Sr is a powerful tool in estimating
El Nino may effect growth behaviour of amazonian trees
The interannual variation of climate in Amazonia is larger than generally believed. El Nino events, 1982/83, affected annual plants and raises the question, whether the cambial activity and the growth rate of Amazonian trees may be influenced by El
Three-dimensional characteristics of the active debris flow are reconstructed from mudlines on 58 trees still standing in the flow path. Mudline formation only on the up-flow side of trees indicates relatively high viscosity of the debris flow
. Mudline height is a function of the maximum thickness and velocity of the flow at any tree.
Precisely dated tree-ring sequences of larch (Larix cajanderi Mayr) extending from 1801-1980 AD from Kamchatka lying in the far east of Asian continent were studied to see the influence of volcanic eruptions on tree growth and to assess
the potential of tree rings for dating ancient volcanic events.
Sequoiadendron gigantea, the world's largest tree by volume, occurs in 75 groves along the western slope of California's Sierra Nevada. This essay focuses on their management since 1890 by four different agencies. Some groves are still logged
Reconstruction of annual temperature (1590-1979) for Longmire, Washington, derived from tree rings
Annual growth records from trees at timberline in the Cascade Range of Washington are correlated with variations in temperature and snow depth and used to reconstruct climatic variation in the past.