Linking canopy leaf area and light environments with tree size distributions to explain Amazon forest demography

2015 ◽  
Vol 18 (7) ◽  
pp. 636-645 ◽  
Author(s):  
Scott C. Stark ◽  
Brian J. Enquist ◽  
Scott R. Saleska ◽  
Veronika Leitold ◽  
Juliana Schietti ◽  
...  
Keyword(s):  
Leaf Area ◽  
Tree Size ◽  
Amazon Forest ◽  
Size Distributions ◽  
Forest Demography

scholarly journals Amazon forest carbon dynamics predicted by profiles of canopy leaf area and light environment

2012 ◽  
Vol 15 (12) ◽  
pp. 1406-1414 ◽  
Author(s):  
Scott C. Stark ◽  
Veronika Leitold ◽  
Jin L. Wu ◽  
Maria O. Hunter ◽  
Carolina V. de Castilho ◽  
...  
Keyword(s):  
Leaf Area ◽  
Carbon Dynamics ◽  
Forest Carbon ◽  
Light Environment ◽  
Amazon Forest

scholarly journals Estimativa de Albedo e Índice de Área Foliar na Amazônia (Albedo Estimate and Leaf Area Index in Amazonia)

2011 ◽  
Vol 4 (1) ◽  
pp. 22 ◽  
Author(s):  
Ailton Marcolino Liberato
Keyword(s):  
Remote Sensing ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Scientific Literature ◽  
Thematic Mapper ◽  
Amazon Forest ◽  
Geometric Correction ◽  
Landsat Images ◽  
Area Index ◽  
Landsat 5 Tm

Propôs-se, neste trabalho, estimar dados de albedo e Indice de Área Foliar (IAF) à superfície terrestre usando-se o sensor Thematic Mapper (TM) do satélite Landsat 5 e compará-lo com valores disponíveis na literatura científica. A região de estudo esta localizada no estado de Rondônia. Para a realização do estudo obtiveram-se quatro imagens orbitais do satélite Landsat 5 – TM, na órbita 231 e ponto 67, nas datas 13/07/2005, 13/05, 30/06 e 16/07 do ano de 2006, a que correspondem os dias Juliano 194, 133, 181 e 197, respectivamente. As correções geométricas para as imagens foram realizadas e geradas as cartas de albedo e IAF. O algoritmo SEBAL estimou satisfatoriamente os valores de albedo e IAF de superfícies sobre áreas de floresta (exceto para IAF) e pastagem.Palavras-chave: sensoriamento remoto, vegetacao, Floresta da Amazonia. Albedo Estimate and Leaf Area Index in Amazonia ABSTRACTThis study objectives the assessment of albedo and Leaf Area Index (LAI) data at surface using  images from Thematic Mapper (TM) sensor onboard Landsat 5 satellite, and  compare the results with values available in the scientific literature. The study area is located in the State of Rondônia. To carry out the study four orbital TM - Landsat images were obtained in the path 231 and row  67, for the dates of 07/13/2005, 06/30 and 07/16 of  2006 year, which correspond to the days 194, 181 and 197, respectively. The geometric correction for images was performed and maps of albedo and IAF were generated. The algorithm SEBAL estimated, satisfactorily, the values of albedo and IAF on the surface pasture and forest (except for LAI).Keywords: remote sensing, vegetation, Amazon Forest.

Comparing individual tree detection and the area-based statistical approach for the retrieval of forest stand characteristics using airborne laser scanning in Scots pine stands

2011 ◽  
Vol 41 (3) ◽  
pp. 583-598 ◽  
Author(s):  
Jussi Peuhkurinen ◽  
Lauri Mehtätalo ◽  
Matti Maltamo
Keyword(s):  
Laser Scanning ◽  
Statistical Approach ◽  
Basal Area ◽  
Airborne Laser Scanning ◽  
Tree Size ◽  
Size Distributions ◽  
Individual Tree ◽  
Tree Detection ◽  
Airborne Laser ◽  
Number Of Stems

Airborne laser scanning based forest inventories employ two major methods: individual tree detection (ITD) and the area-based statistical approach (ABSA). ITD is based on the assumption that trees are of a certain form and can be delineated using airborne laser scanning techniques, whereas ABSA is an empirical method based on the relations between area-level forest attributes and laser echo height distributions. These two methods are compared here within the same test area in terms of their usefulness for estimating mean forest stand characteristics and tree size distributions. All evaluations were performed using leave-one-out cross validation. The average errors in volume and basal area did not differ significantly between the methods. ABSA resulted in overall better accuracies when estimating the diameter and height of the basal area median tree and the number of stems, whereas ITD produced significantly biased estimates for the number of stems and the mean tree size. Tree size distributions were estimated with slightly better accuracy using ABSA. More comprehensive investigations revealed that both methods were not able to estimate forest structure (tree size distribution and spatial distribution of tree locations), which in turn, affected the estimation accuracies.

scholarly journals Biomass Allocation into Woody Parts and Foliage in Young Common Aspen (Populus tremula L.)—Trees and a Stand-Level Study in the Western Carpathians

Forests ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 464 ◽  
Author(s):  
Bohdan Konôpka ◽  
Jozef Pajtík ◽  
Vladimír Šebeň ◽  
Peter Surový ◽  
Katarína Merganičová
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Biomass Allocation ◽  
Tree Size ◽  
Populus Tremula ◽  
Tree Biomass ◽  
Area Index ◽  
Biomass Models ◽  
Maximum Value ◽  
Independent Variable

Our research of common aspen (Populus tremula L.) focused on the forested mountainous area in central Slovakia. Forest stands (specifically 27 plots from 9 sites) with ages between 2 and 15 years were included in measurements and sampling. Whole tree biomass of aspen individuals was destructively sampled, separated into tree components (leaves, branches, stem, and roots), and then dried and weighed. Subsamples of fresh leaves from three crown parts (upper, middle, and lower) were scanned, dried, and weighed. Allometric biomass models with stem base diameter as an independent variable were derived for individual tree components. Basic foliage traits, i.e., leaf mass, leaf area, and specific leaf area, were modelled with regard to tree size and leaf position within the crown. Moreover, biomass stock of the woody parts and foliage as well as the leaf area index were modelled using mean stand diameter as an independent variable. Foliage traits changed with both tree size and crown part. Biomass models showed that foliage contribution to total tree biomass decreased with tree size. The total foliage area of a tree increased with tree size, reaching its maximum value of about 12 m2 for a tree with a diameter of 120 mm. Leaf area index increased with mean stand diameter, reaching a maximum value of 13.5 m2 m−2. Since no data for biomass allocation for common aspen had been available at either the tree or stand levels, our findings might serve for both theoretical (e.g., modelling of growth processes) and practical (forestry and agro-forestry stakeholders) purposes.

scholarly journals Seasonal and drought‐related changes in leaf area profiles depend on height and light environment in an Amazon forest

2019 ◽  
Vol 222 (3) ◽  
pp. 1284-1297 ◽  
Author(s):  
Marielle N. Smith ◽  
Scott C. Stark ◽  
Tyeen C. Taylor ◽  
Mauricio L. Ferreira ◽  
Eronaldo Oliveira ◽  
...  
Keyword(s):  
Leaf Area ◽  
Light Environment ◽  
Amazon Forest

Mortality and tree-size distributions in natural mixed-age forests

2007 ◽  
Vol 95 (1) ◽  
pp. 27-40 ◽  
Author(s):  
DAVID A. COOMES ◽  
ROBERT B. ALLEN
Keyword(s):  
Tree Size ◽  
Size Distributions ◽  
Mixed Age

Crown structure and growth efficiency of red spruce in uneven-aged, mixed-species stands in Maine

1998 ◽  
Vol 28 (8) ◽  
pp. 1233-1240 ◽  
Author(s):  
Douglas A Maguire ◽  
John C Brissette ◽  
Lianhong Gu
Keyword(s):  
Leaf Area ◽  
Volume Growth ◽  
Growth Efficiency ◽  
Tree Size ◽  
Red Spruce ◽  
Stem Volume ◽  
Mixed Species ◽  
Individual Tree ◽  
South Central ◽  
Tree Leaf

Several hypotheses about the relationships among individual tree growth, tree leaf area, and relative tree size or position were tested with red spruce (Picea rubens Sarg.) growing in uneven-aged, mixed-species forests of south-central Maine, U.S.A. Based on data from 65 sample trees, predictive models were developed to (i)estimate the amount of foliage held by individual trees from sapwood cross-sectional area and (ii)define the relationship between stem volume growth and three variables: total foliage area, relative position in the stand, and the degree of past suppression. A model that included variables representing tree size (or relative social position) and degree of past suppression (live branch whorls per unit crown length) indicated that stem volume growth first increased but later decreased over leaf area when other variables were held constant. Growth efficiency declined with increasing tree leaf area, although greater height and diameter enhanced growth efficiency and greater past suppression diminished growth efficiency. The decline in growth efficiency with greater leaf area likely is attributable to one or several of the factors previously identified as contributing to growth declines in mature, even-aged stands.

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