scholarly journals MAIDEN: a model for analyzing ecosystem processes in dendroecology

2004 ◽  
Vol 34 (4) ◽  
pp. 874-887 ◽  
Author(s):  
Laurent Misson
Keyword(s):  
Soil Water ◽  
Vapor Pressure Deficit ◽  
Ring Width ◽  
Stand Density ◽  
Quercus Petraea ◽  
Bud Burst ◽  
Ecological Data ◽  
Growing Season Length ◽  
Major Controlling Factor ◽  
The Relationship

Ecophysiological and dendroecological data from a temperate sessile oak (Quercus petraea (Matt.) Liebl.) stand in Belgium were used to develop and parameterize a dendroecological process-based model. The purpose of this model is to serve as a tool for exploring the relationship between climate variability and tree growth based on dendro ecological data. When parameterized, the model was able to correctly simulate measurements of bud-burst date, through fall (r2 = 0.95), soil water content (r2 = 0.81), transpiration (r2 = 0.80), and ring-width series from 1960 to 1999 (r2 = 0.46). Model sensitivity analysis showed that atmospheric vapor pressure deficit is the major controlling factor of transpiration in this type of ecosystem. The model shows that bole increment is principally controlled by temperature because it affects the phenological process of bud burst and thus the growing season length. Precipitation variability does not affect variation of transpiration rate and bole increment because calculated soil water stress is negligible during the simulation period. Discrepancies between observed and simulated bole increment may be a consequence of stand density variations and worm defoliation in the spring. The MAIDEN model is particularly suited for dendreocological analysis because it takes simple species, site condition, and climatic variables as input.

The effect of stand structure and stand density on the leaf area–sapwood area relationship of lodgepole pine

1989 ◽  
Vol 19 (3) ◽  
pp. 392-396 ◽  
Author(s):  
Dan C. Thompson
Keyword(s):  
Leaf Area ◽  
Stand Structure ◽  
Lodgepole Pine ◽  
Habitat Type ◽  
Ring Width ◽  
Stand Density ◽  
Habitat Types ◽  
Sapwood Area ◽  
Relationship Of ◽  
The Relationship

The relationship of sapwood area to leaf area in lodgepole pine was examined across a variety of habitat types and stand densities in northwest Montana. No statistical differences were found between plots with regard to either habitat type or stand density. A nonlinear relationship was found between leaf area and sapwood area. Increasing amounts of sapwood were associated with a decrease in the leaf area–sapwood area ratio. A large amount of within-plot variation in the sapwood area–leaf area relationship was explained by differences between dominant trees and trees of other crown classes. Leaf area (LA) was best estimated by the equation LA = 0.12 × S − 0.0003 × S2 + 0.06 × S × D, where LA is leaf area, S is sapwood area, and D is the crown class (dominant). Differences between dominant and subdominant trees appear to be related to ring width and its associated permeability. Differences in sapwood area–leaf area equations among different studies may be due in part to differences in stand structure.

Conifer water potential as influenced by stand density and environmental factors

1973 ◽  
Vol 51 (12) ◽  
pp. 2333-2337 ◽  
Author(s):  
Carl L. Wambolt
Keyword(s):  
Water Potential ◽  
Vapor Pressure Deficit ◽  
Plant Density ◽  
Correlation Coefficients ◽  
Stand Density ◽  
Quantitative Evidence ◽  
Sand Temperature ◽  
Highly Correlated ◽  
Relationship Of ◽  
The Relationship

An investigation of several conifer species was conducted to evaluate the influence of atmospheric, edaphic, topographic, and vegetation variables of the environment on water potential. Correlation coefficients averaged close to 1.0 for the relationship of plant density to water potential when other environmental influences were static. This was interpreted as quantitative evidence of the intraspecific competition for available moisture by plants. Water potential values of 21 stands of coniferous trees, 3 each of seven species, were quite highly correlated (R = 0.84) to elevation, percentage sand, temperature, relative humidity, and vapor pressure deficit, even though the stands were found in widely divergent habitats.

The effects of ring width, stem position, and stand density on the relationship between foliage biomass and sapwood area in Scots pine (Pinussylvestris)

1995 ◽  
Vol 25 (6) ◽  
pp. 970-977 ◽  
Author(s):  
Annikki Mäkelä ◽  
Katri Virtanen ◽  
Eero Nikinmaa
Keyword(s):  
Scots Pine ◽  
Ring Width ◽  
Stand Density ◽  
Relative Height ◽  
Data Set ◽  
Measuring Point ◽  
Sapwood Area ◽  
Breast Height ◽  
The Relationship ◽  
Stem Position

The effects of the average ring width of sapwood, bole length, and stand density on the relationship between foliage biomass and sapwood area at four different stem positions were studied in a data set comprising 20 ca. 35-year-old Scots pine (Pinussylvestris L.) trees in southern Finland. The average ring width within sapwood had no effect on the foliagersapwood ratio inside the crown, but a correlation was found when sapwood was measured at breast height or 20% relative height. The distance of the measuring point from the crown base provided a bigger improvement of foliage biomass prediction from sapwood, a finding emphasizing the significance of the taper of sapwood along the bole. After accounting for the sapwood taper, no differences could be detected between thinned and unthinned stands, nor between breast height and 20% relative height.

scholarly journals Greater capacity to exploit warming temperatures in northern populations of European beech is partly driven by delayed leaf senescence

2019 ◽  
Author(s):  
Homero Gárate-Escamilla ◽  
Craig C. Brelsford ◽  
Arndt Hampe ◽  
T. Matthew Robson ◽  
Marta Benito Garzón
Keyword(s):  
Climate Change ◽  
Leaf Senescence ◽  
European Beech ◽  
Growing Season ◽  
Bud Burst ◽  
Local Climate ◽  
Growing Season Length ◽  
Tree Phenology ◽  
Genetically Determined ◽  
The Relationship

AbstractOne of the most widespread consequences of climate change is the disruption of trees’ phenological cycles. The extent to which tree phenology varies with local climate is largely genetically determined, and while a combination of temperature and photoperiodic cues are typically found to trigger bud burst (BB) in spring, it has proven harder to identify the main cues driving leaf senescence (LS) in autumn. We used 925 individual field-observations of BB and LS from six Fagus sylvatica provenances, covering the range of environmental conditions found across the species distribution, to: (i) estimate the dates of BB and LS of these provenances; (ii) assess the main drivers of LS; and (iii) predict the likely variation in the growing season length (GSL; defined by BB and LS timing) across populations under current and future climate scenarios. To this end, we first calibrated linear mixed-effects models for LS as a function of temperature, insolation and BB date. Secondly, we calculated the GSL for each provenance as the number of days between BB and LS. We found that: i) there were larger differences among provenances in the date of LS than in the date of BB; ii) the temperature through September, October and November was the main determinant of LS in beech, although covariation of temperature with daily insolation and precipitation-related variables suggests that all three variables may affect LS timing; and iii) GSL was predicted to increase in northern beech provenances and to shrink in populations from the core and the southern range under climate change. Consequently, the large differences in GSL across beech range in the present climate are likely to decrease under future climates where rising temperatures will alter the relationship between BB and LS, with northern populations increasing productivity by extending their growing season to take advantage of warmer conditions.

scholarly journals Regression Models for Soil Water Storage Estimation Using the ESA CCI Satellite Soil Moisture Product: A Case Study in Northeast Portugal

Water ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 37
Author(s):  
Tomás de Figueiredo ◽  
Ana Caroline Royer ◽  
Felícia Fonseca ◽  
Fabiana Costa de Araújo Schütz ◽  
Zulimar Hernández
Keyword(s):  
Soil Moisture ◽  
Soil Water ◽  
Regression Models ◽  
Meteorological Data ◽  
Water Storage ◽  
Model Performance ◽  
Soil Water Balance ◽  
Soil Water Storage ◽  
The Relationship

The European Space Agency Climate Change Initiative Soil Moisture (ESA CCI SM) product provides soil moisture estimates from radar satellite data with a daily temporal resolution. Despite validation exercises with ground data that have been performed since the product’s launch, SM has not yet been consistently related to soil water storage, which is a key step for its application for prediction purposes. This study aimed to analyse the relationship between soil water storage (S), which was obtained from soil water balance computations with ground meteorological data, and soil moisture, which was obtained from radar data, as affected by soil water storage capacity (Smax). As a case study, a 14-year monthly series of soil water storage, produced via soil water balance computations using ground meteorological data from northeast Portugal and Smax from 25 mm to 150 mm, were matched with the corresponding monthly averaged SM product. Linear (I) and logistic (II) regression models relating S with SM were compared. Model performance (r2 in the 0.8–0.9 range) varied non-monotonically with Smax, with it being the highest at an Smax of 50 mm. The logistic model (II) performed better than the linear model (I) in the lower range of Smax. Improvements in model performance obtained with segregation of the data series in two subsets, representing soil water recharge and depletion phases throughout the year, outlined the hysteresis in the relationship between S and SM.

scholarly journals The Relationship between Tree-Ring Growths of Pinus densiflora and Climate from Three Mountains in Central Region, the Republic of Korea

Atmosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 878
Author(s):  
Chang-Hyun Park ◽  
Ui-Cheon Lee ◽  
Soo-Chul Kim ◽  
Kwang-Hee Lee
Keyword(s):  
Tree Ring ◽  
National Parks ◽  
Central Region ◽  
Climatic Factors ◽  
Pinus Densiflora ◽  
Ring Width ◽  
Republic Of Korea ◽  
Logarithmic Curve ◽  
The Republic ◽  
The Relationship

To analyze the relationship between climatic factors (monthly mean temperature and total precipitation) and tree-ring growths of Pinus densiflora from the central region of the Republic of Korea, more than 20 trees were sampled from three national parks. The tree-ring chronology of Mt. Bukhan covering the period of 1917–2016 was assessed, as well as that of Mt. Seorak across 1687–2017 and Mt. Worak across 1777–2017. After cross-dating, each ring-width series was double-standardized by first fitting a logarithmic curve and then a 50 year cubic spline. Climate-growth relationships were computed with bootstrap correlation functions. The result of the analysis showed a positive response from the current March temperature and May precipitations for tree-ring growth of Pinus densiflora. It indicates that a higher temperature supply during early spring season and precipitation during cambium activity are important for radial growths of Pinus densiflora from the central region in the Republic of Korea.

A descriptive model of the relationship between rainfall and soil water table

1980 ◽  
Vol 47 (1-2) ◽  
pp. 103-114 ◽  
Author(s):  
K. Rennolls ◽  
R. Carnell ◽  
V. Tee
Keyword(s):  
Soil Water ◽  
Water Table ◽  
Descriptive Model ◽  
The Relationship

Relatii temporale între parametrii climatici si cresterile anuale ale speciilor forestiere (studiu de caz)

2019 ◽  
Author(s):  
Maria Nedealcov ◽  
◽  
Ala Donica ◽  
Ion Agapi ◽  
Nicolae Grigoras ◽  
...  
Keyword(s):  
Climatic Factors ◽  
Growth Parameters ◽  
Ring Width ◽  
Aridity Index ◽  
Quercus Petraea ◽  
Distribution Area ◽  
Natural Distribution ◽  
Annual Ring Width ◽  
Republic Of Moldova ◽  
The Republic

The forests on the natural distribution area from the silvosteppe zone, under the influence of climate change will experience major changes in their structure and functioning. The analysis of growth parameters for Fraxinus excelsior, Quercus petraea, Q. robur in three experimental areas from center of the Republic of Moldova indicates that the radial growth processes are influenced by the same complex of climatic factors, which differ being dendroclimatic response intensity. It has been shown that between the annual tree growth and forest aridity index - FAI, there are close correlations: the higher FAI values indicate the lower annual growth of the trees, and vice versa, low FAI values identify good development conditions of the stands (higher increases in the annual ring width).

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