The Crown Window — a simple device for measuring tree crowns

Hussein, Khalid; Gadow, Klaus von; Albert, Matthias

doi:10.1007/bf02769125

Cited by 12 publications

(9 citation statements)

References 6 publications

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“…We measured crown length, basal crown radius, and crown shape on each tree, and then used these data to estimate crown volume, flower density, and cone density. Crown shape was classified as thin neiloid, neiloid, cone, fat cone, paraboloid, or expanded paraboloid (Coder 2000) using a crown window technique (Hussein et al 2000). Crown length, basal crown radius, and tree shape were then used to calculate crown volume of each tree (Coder 2000).…”

Section: Methodsmentioning

confidence: 99%

High-density miniaturized seed orchards of Douglas-fir

Kolpak

Smith²,

Albrecht

et al. 2014

New Forests

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We studied miniaturized seed orchards (MSOs) and conventional orchards of coastal Douglas-fir (Pseudotsuga menziesii var. menziesii) in a series of experiments conducted at three locations in Oregon and Washington between 2002 and 2012. In Experiment 1, cone yields were greater using stem girdles plus stem injections of GA 4/7 compared to girdling alone, root pruning, and girdling plus fertilization with Ca(NO 3 ) 2 . In Experiment 2, topping and pruning in the summer following flower stimulation minimized crown volume and maximized female and male flower densities. In Experiment 3, the widest spaced orchard (4 9 6 m) generally produced more flowers and cones per tree, and greater flower and cone densities compared to the narrow spaced orchards (1 9 3 and 2 9 4 m). We conclude that narrow spaced MSOs may produce more cones per hectare in the early years after establishment, but wider spaced orchards will be more productive a few years later. In general, per-hectare cone yields were similar or greater in the MSOs compared to nearby conventionally spaced orchards. Trees grafted using scions collected from juvenile trees (age 6) generally had larger crowns, more female flowers and cones per tree, and greater female flower and cone densities compared to scions collected from middle-aged (age 29) or mature (56-to 99-year-old) trees. We found no evidence that clonal rows resulted in reduced seed quality relative to nearby conventional orchards. Implications for Douglas-fir seed orchard management are discussed.

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Section: Methodsmentioning

confidence: 99%

High-density miniaturized seed orchards of Douglas-fir

Kolpak

Smith²,

Albrecht

et al. 2014

New Forests

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“…The crown profile of each tree was measured using a device developed by Hussein, Albert, and Gadow (2000). The device consists of a piece of transparent methacrylate (0.25 x 0.40 m) attached to gestionadas bajo el método mexicano de ordenación de bosques irregulares con cortas selectivas, con el objetivo de realizar la cosecha y propiciar la regeneración y distribución de la masa en todas las características diamétricas.…”

Section: Measuring Crown Profiles Of P Cooperiunclassified

“…Visual methods have shown good accuracy in measuring crown radius and its corresponding height (Hussein et al, 2000;Rautiainen & Stenberg, 2005) and other crown variables (Martín- García, Diez, & Jactel, 2009). …”

Section: Medición De Los Perfiles De La Copa De P Cooperimentioning

confidence: 99%

“…The models of Pretzsch (1992) and Hann (1999) have similar formulations although the latter includes the variables HT and D, making it more flexible than the first. In the case of the model of Hann (1999), the equation for the shaded crown (Table 2) Los métodos visuales han mostrado buena precisión en la medición del radio de copa y su altura correspondiente (Hussein et al, 2000;Rautiainen & Stenberg, 2005) y de otras variables características de la copa (Martín-García, Diez, & Jactel, 2009).…”

Section: Models Analyzedmentioning

confidence: 99%

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Desarrollo de un modelo de perfil de copa para Pinus cooperi Blanco en la UMAFOR 1008, Durango, México

Soto-Cervantes¹,

López-Sánchez²,

Corral-Rivas³

et al. 2016

Rev Cha Se Cie For y del Amb

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Se desarrolló un modelo de perfil de copa para Pinus cooperi Blanco a partir de 92 árboles en la UMAFOR 1008 (Región El Salto, Pueblo Nuevo, Durango). Se seleccionaron individuos con una copa bien conformada y de diferente edad, densidad y calidad de estación. En cada uno de los individuos se midieron las variables diámetro normal, altura total, diámetro, longitud y perfil de copa. Tanto formas geométricas sencillas como algunos modelos matemáticos se analizaron para predecir el perfil de la copa. El mejor modelo para describir el perfil de copa de P. cooperi fue el de Hann (1999), ya que tuvo mejor ajuste para la copa entera, copa de luz y copa de sombra, explicando más de 92 % de la variabilidad de los datos.

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“…Die Erfassung der Kronenperipherie, der Kronenradien bei unterschiedlichen Baumhöhen, ist dagegen erheblich schwieriger. Zu diesem Zweck entwickelten Albert (1994) und Hussein et al (2000) 1 das sog. Kronenfenster, eine auf einem Stativ befestigte durchsichtige Plastikscheibe, auf die ein gleichmäßiges Gitternetz eingebrannt ist.…”

Section: Das Kronenfenster -Erfassung Der Kronenform Im Geländeunclassified

Waldstruktur und Wachstum

Gadow¹

2003

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The Crown Window — a simple device for measuring tree crowns

Cited by 12 publications

References 6 publications

High-density miniaturized seed orchards of Douglas-fir

High-density miniaturized seed orchards of Douglas-fir

Desarrollo de un modelo de perfil de copa para Pinus cooperi Blanco en la UMAFOR 1008, Durango, México

Waldstruktur und Wachstum

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