Percent canopy cover and stand structure statistics from the Forest Vegetation Simulator

Crookston, Nicholas L.; Stage, Albert R.

doi:10.2737/rmrs-gtr-24

Cited by 104 publications

(76 citation statements)

References 2 publications

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“…Over all, the logarithmic approach, which is used here as an example for similar and sometimes more sophisticated procedures (e.g. [13,17,51]), produced slightly better results and would perform even better if parameters would have been fitted for each plot separately. Furthermore, the estimates produced with the MRE method seem to be more sensitive to stand density effects than established estimation methods [9] -at least for trees with inflexible crowns.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, maximum crown radius, which can be derived from stem diameter, has been used to estimate crown projection area [19,51]. Because increasing stand density results in increasing overestimates an adjustment factor has been introduced that is generally derived from overlap estimates [13]. More recently, average crown radius and canopy cover in several types of conifer forests were successfully estimated with regression equations that have been derived from stem diameter, height, and/or crown length [17].…”

Section: Introductionmentioning

confidence: 99%

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Estimation of crown radii and crown projection area from stem size and tree position

Grote

2003

Ann. For. Sci.

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-This paper describes a method for crown radii estimation in different cardinal directions using tree diameter, height, crown length, and stem position within the stand as independent variables. The approach can serve for the initialisation of crown dimensions if measured crown radii are not available in order to address various research questions. Test calculations are carried out with 4 pure spruce (Picea abies L. Karst), 5 beech (Fagus sylvatica L.), and 6 mixed stands with both species. Simulated tree radii, crown projection area and canopy cover are compared with measurements and simple estimation procedures based on logarithmic and linear equations. In beech stands and dense spruce stands the estimates with the new approach are similar or superior to those obtained with the other methods. However, in sparse plots or in stands, which have experienced a recent thinning crown size of trees is overestimated.crown projection area / crown radii / Fagus sylvatica / mixed forests / Picea abies Résumé -Estimation des rayons et de la zone de projection de la couronne en utilisant les dimensions de la tige et la position de l'arbre. Cet article introduit une méthode mathématique qui permet une estimation du rayon, en utilisant seulement les dimensions de la tige de la couronne et la position de l'arbre. Cette méthode permet d'initialiser les dimensions de la couronne dans le cas où on ne connaît pas les rayons pour ainsi traiter de différentes questions scientifiques. La méthode est testée sur de nombreux peuplements d' épicéas (Picea abies) et de hêtres (Fagus sylvatica), non seulement constitués d'une seule essence mais aussi de forêts mixtes, dans le sud de l'Allemagne. Les simulations du rayon des couronnes, de la surface de projection d'une couronne et du degré de couverture sont comparées avec des mesures et d'autres estimations basées sur des équations linéaires ou logarithmiques. Les résultats montrent que la nouvelle méthode est appropriée pour la représentation des rayons des couronnes de hêtres et pour des peuplements denses d'épicéa. En revanche le rayon et la surface de la couronne d'arbres ayant poussé dans des lieux clairsemés ou ayant subi une éclaircie sont surestimés.projection des couronnes / rayons des couronnes / Fagus sylvatica / forêts mixtes / Picea abies

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Estimation of crown radii and crown projection area from stem size and tree position

Grote

2003

Ann. For. Sci.

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“…(45°N, 116.15°W). Mild summers and long-cold winters characterize the climate in the area (Hansen et al 1989 Crookston and Stage (1999), Irwin and Peek (1979), Moeur (1985), andStage (1973) Alldredge (1999) reported that elk foraged in areas that had been logged within the past 20 years, except during the rifle hunting season, when they switched to mature conifer cover, confirming the general pattern observed by Hash (1973), Hershey and Leege (1984), Peek (1983b, McLean (1972), and Unsworth et al (1998) Collections for all of these species were made on 3 sites in 6 areas in mid-June, mid-August, and mid-November, 1997-1998and May 1998 (Wolf and Carson 1973).…”

Section: Study Areamentioning

confidence: 99%

Nutritional quality of forages used by elk in northern Idaho

Alldredge¹,

Peek²,

Wall³

2002

REM

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The nutritional quality (digestible energy, crude protein, and minerals) of 7 known elk (Cervus ResumenSe evaluo la calidad nutricional (energia digestible, proteina cruda y minerales) de 7 especies forrajes que se sabe que el alce (Cervus elaphus Linnaeus) las consume, la evaluacion se realizo en 4 diferentes periodos de tiempo de Mayo a Noveembre. Las especies evaluadas fueron: "Elk sedge" (Carex geyeri Boott), "Kentucky bluegrass" (Poa pratensis Linnaeus), "Western goldthread" (Coptis occidentalis Nuttall), "Clover" (Trifolium repens Linnaeus), "Serviceberry" (Amelanchier alnifolia Nuttall), "Redstem ceanothus" (Ceanothus sanguineus Pursh) y "Scouler willow" (Salix scouleriana Barratt). Las concentraciones de minerales generalmente satisfacen los requerimientos estimados para el alce en todas las estaciones, excepto sodio el cual permanece abajo de los requerimientos en todas las estaciones. A traves de todo el ano la proteina cruda de la mayoria de las especies de plantas muestreadas fue adecuada para las hembras prenadas o lactantes, sin embargo, en Agosto, las concentraciones de proteina cruda de las gramineas cayo por abajo de los requerimientos. El forraje proveyo de energia digestible adecuada para las hembras adultas prenadas o lactantes solo en Mayo, indicando deficiencias potenciales en verano y otono. Para tener una nutricion adecuada el alce debe ser selectivo de las partes de la planta que consume, el genero de planta y el habitat de forrajeo. En esta area la calidad del forraje en verano y otono puede ser critica para las hembras lactantes de alce.Industrial forests in northern Idaho managed primarily for timber production contain substantial populations of elk. These forests contain a mixture of age classes of trees in a diverse mosaic of successional patterns. However, they do not provide large blocks of mature timber for security cover and road densities are high, causing them to fall outside of the suitable criteria for elk habitat developed by Leege (1984).Elk presumably select habitats that have high quality, abundant forage, or provide cover (Patton 1974, Edge et al. 1988, Thomas et al. 1979). Nutritional quality of available forages may change with phenological stage, between vegetation classes, aspect, and overstory structure (Irwin and Peek 1979). Nutrition is assumed to be a primary factor influencing elk distribution, abundance, and productivity (Cook in press). However, few studies have described forage quality and attempt to relate this to the nutritional levels that elk experience.We examined nutritional quality of primary elk forages in an industrial forest. We build on the substantial number of elk habitat use investigations in northern Idaho showing the importance of seral shrub communities as foraging areas. Substantial knowledge of food habits and responses of forage plants to logging and burning is also available for this area to pursue the analyses. Specific objectives were to (1) assess the variability in digestible energy, crude protein, and mineral concentrati...

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“…It can simulate growth and yield for major forest tree species, forest types, and stand conditions for all national forests in the US [35]. For instance, Wang et al [19] used a Forest Inventory Analysis (FIA) dataset to simulate the dynamics of tree size (diameter and height) for different forest types in FVS models and VNS.…”

Section: Forest Vegetation Simulator (Fvs)mentioning

confidence: 99%

“…FVS is a distance-independent growth and yield model at the individual tree scale [35]. It can simulate growth and yield for major forest tree species, forest types, and stand conditions for all national forests in the US [35].…”

Section: Forest Vegetation Simulator (Fvs)mentioning

confidence: 99%

Three-Dimensional Landscape Visualizations: New Technique towards Wildfire and Forest Bark Beetle Management

Chou

Song

Hedden

et al. 2010

Forests

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After a century of fire exclusion, western US forests are vulnerable to wildfire and bark beetles. Although integrated fire and pest management programs (e.g., prescribed burning and thinning) are being implemented efficiently, damage to forests continues.Management challenges come in the forms of diverse land ownership, dynamic forest landscapes, the uncertainty effect of management strategies, and social interaction of the increasing wildland-urban interface. Three-dimensional (3-D) landscape visualization is comprised of multi-spatial, multi-temporal, and multi-expression elements. Supplemented with GIS database, remote sensing images, and simulation models, this technique can provide a comprehensive communication medium for decision makers, scientists, stakeholders, and the public with diverse backgrounds on the wildfire and forest bark beetle management. The technique we describe here can be used to organize complicated temporal and spatial information, evaluate alternative management operations, and OPEN ACCESSForests 2010, 1 83 improve decision-making processes. The application and limitations of our technique are also discussed.

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Percent canopy cover and stand structure statistics from the Forest Vegetation Simulator

Cited by 104 publications

References 2 publications

Estimation of crown radii and crown projection area from stem size and tree position

Estimation of crown radii and crown projection area from stem size and tree position

Nutritional quality of forages used by elk in northern Idaho

Three-Dimensional Landscape Visualizations: New Technique towards Wildfire and Forest Bark Beetle Management

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