Rolling stones and tree rings : A state of research on dendrogeomorphic reconstructions of rockfall
This progress report focuses on the contribution of tree-ring series to rockfall research and on recent development and challenges in the field. Dendrogeomorphic techniques have been used extensively since the early 2000s and several approaches have
been developed to extract rockfall signals from tree-ring records of conifer trees. In this report, the AA. propose a new approach considering impact probability and quantification of uncertainty in the reconstruction of rockfall time series as well
in natural systems is widespread. In the geomorphic subsystem its most obvious manifestation is the origin and disappearance of pit-and-mound microtopography resulting from tree uprooting. 82 pit-and-mound associations have been mapped on a test slope
, providing quantitative data for calculating sediment flux. Tree bending and abrupt changes in tree ring width are indicators of disturbed tree growth, causally linked to soil creep of mudstone-derived regolith. Eccentric growth is best recorded in wet years
and in younger trees, which have to adapt to the pre-existing pit-and-mound surface topography. The AA. offer a conceptual model that links biotic and abiotic factors and discuss implications of the widespread tree uprooting. They suggest that veneers of angular
Urban tree planting programs, function or fashion? Los Angeles and urban tree planting campaigns
California ; Geographical information system ; Green space ; Los Angeles ; Non-governmental organization ; Plantation ; Project ; Public service ; Spatial analysis ; Tree ; United States of America ; Urban function ; Urban policy
Application of eccentric growth of trees as a tool for landslide analyses : The example of Picea abies Karst. in the Carpathian and Sudeten Mountains (Central Europe)
A method based on dendrochronology was developed to analyse the spatial and temporal variability of landslide activity. The method involves a feature of wood anatomy, tree-ring eccentricity, which is used in the dating procedure. The degree
of eccentricity is used as an indicator of the intensity of the mechanical stress affecting a tree stem in a certain year. The aim was to develop a mathematical indicator of tree-ring eccentricity for dating the recent dynamics of landslides. A method presented
Spatial distribution of trees and landscapes of the past : a mixed spatially correlated multinomial logit model approach for the analysis of the public land survey data
Forest ; Forest stand ; Land utilisation ; Logit model ; Model ; Tree ; United States of America ; Vegetation ; Vegetation dynamics
Disturbance and riparian tree establishment in the Sespe Wilderness, California, USA
The AA. use dendrochronology to identify establishment dates for stems of major riparian tree species in the Sespe Creek watershed, in order to examine their relationship to regional flooding and fire history. The 11 study sites were burned by major
A dendrogeomorphic investigation involving an extensive dendrometric survey and tree-ring analysis of Norway spruce trees (Picea abies (L.) Karst.) was used to reconstruct the spatial and temporal activity of the Mazák landslide, situated
in the highest part of the Czech Outer Western Carpathians. A tree-ring analysis shows 9 major landslide years (1929, 1940, 1949, 1960, 1972, 1980, 1985, 1997, and 2000) accompanied by 6 additional years with minor reactivations (1933, 1945, 1955, 1958, 1977
Hydrological shifts and tree growth responses to river modification along the Apalachicola River, Florida
tree growth using dendrochronology and compared these trends with hydrological and climatic variables. Comparisons of stream-gage data before and after dam construction on the Apalachicola River revealed statistically significant mean declines in annual
Adygea ; Altitudinal zonation ; Caucasus ; Climatic change ; European part of Russia ; Fir tree ; Forest ; Impact ; Mountain ; Tree line ; Vegetation dynamics
to channels. To understand the connectivity between hillslopes and channels and between sources and sink, trees were sampled along the main Rossloch stream, on the Schimbrig earth flow and on the Rossloch depositional area. Geomorphic observations
and dendrogeomophic results indicate different mechanisms of sediment production, transfer and deposition between upper and lower segments of the channel network. Tree analysis allowed the reconstruction of periods of high activity during the last century
in grazing pressure and tree felling from the early 1960s onwards after 200 years of these activities, and fires. In the 1960s tree planting also took place. During the period 1963 to 1970 there was a marked decline in drift potential (DP – potential sand
and trees, participants look at when evaluating restoration likelihood. Further, we compare number of fixations in restorative and non-restorative park photos. Photos were selected based on ratings of low and high likelihood of restoration. Participants were
; instead participants looked at components that were of importance for assessing restoration likelihood. The components participants looked at the most were trees, followed by benches and bushes. This presents new information on people's view patterns
realistic estimates of soil temperature and soil respiration; and using observations of depth to estimate the influence of snow accumulation and tree wells on soil respiration. Including remote sensing observations of snow properties in models of NEE could
The loss of eastern hemlock is of particular concern because hemlock is : (1) a foundation species; (2) one of the longest-lived tree species over much of temperate eastern North America; and (3) sensitive to climatic variation and ecosystem