The spatial pattern of a northern conifer-hardwood landscape

Pastor, John; Broschart, Michael R.

doi:10.1007/bf02573951

Cited by 105 publications

(88 citation statements)

References 16 publications

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“…Within medium-textured, quartz-sand soils of northern Michigan, ortstein layers (variously described as hardpan and fragipan) have been demonstrated to increase both water-holding capacity and nutrient availability (Franzmeier et al 1963), thereby favoring development of old-growth white pine stands as well as mature hemlock-hardwoods (Figs. 3, 5, 7) Barnes 1985a, 1985b;Simpson et al 1990;Pastor and Broschart 1990). In our study area, radiocarbon-dated sequences of lake sediments and paleosols document that formation of the ortstein horizon in quartz-sand substrates occurred between 6900 and 3200 yr B.P.…”

Section: Vegetation~soils Relationshipsmentioning

confidence: 78%

Presettlement landscape heterogeneity: Evaluating grain of resolution using General Land Office Survey data

Delcourt

1996

Landscape Ecol

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General Land Office Survey (GLOS) records from the A.D. 1840s provide data for quantitative characterization of presettlement vegetation across western Mackinac County, Michigan, located within the mixed conifer-northern hardwoods forest region. We analyzed data from land survey plat maps and 1958 bearing, witness, and line trees from 162 surveyed section and quarter-section corners in order to map vegetation cover types at a level of spatial resolution appropriate for characterizing landscape heterogeneity using standard landscape ecological metrics. As also demonstrated by a number of both classic and contemporary plant-ecological studies, the distribution of landforms, soils properties, hydrology, and location of fire breaks all contribute to the heterogeneity in vegetation observed at a landscape scale in the region. Through a series of spatial landscape analyses with differing grain of resolution, in this study we determine that a grid cell size of 65 ha (0.5 mi • 0.5 mi or 0.25 mi 2) to 259 ha (1 mi 2) gives a conservative characterization of landscape heterogeneity using standard metrics and is therefore appropriate for use of GLOS data to study historical landscape changes.

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Section: Vegetation~soils Relationshipsmentioning

confidence: 78%

Presettlement landscape heterogeneity: Evaluating grain of resolution using General Land Office Survey data

Delcourt

1996

Landscape Ecol

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“…To test the hypothesis that various plant communities segregate according to a given landscape feature or some combination of landscape features, an electivity index can be used (Jacobs, 1974;Jenkins, 1979;Pastor and Broschart, 1990). An electivity index calculates the juxtaposition of one cover type from one GIS data layer with some other landscape feature in a separate data layer.…”

Section: Discussionmentioning

confidence: 99%

Hydro-Geomorphic Classification and Potential Vegetation Mapping for Upper Mississippi River Bottomland Restoration

Theiling¹,

Bettis²,

Heitmeyer³

2012

Studies on Environmental and Applied Geomorphology

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“…Consequently, we used the area-weighted mean patch fractal dimension index (AWMPFD) (McGarigal and Marks 1994). Because different cover types result from different ecological processes (e.g., recent stand-replacing disturbances vs. succession), some cover types are associated with more complex shapes than others (Pastor and Broschart 1990).…”

Section: Patch Shape Indexmentioning

confidence: 99%

Historical analysis of landscape change in the eastern boreal mixedwood: A case study in the context of cohort-based management

Latrémouille

Valeria

Harvey

2013

The Forestry Chronicle

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Maintenance of forest spatial structure through forest management is increasingly recognized as an important landscape-level aspect to maintaining biodiversity. In this study, we use forest inventory maps dating from 1965, 1972, 1983, and 1994 to describe the recent historical spatial structure at the Lake Duparquet Research and Teaching Forest (LDRTF) in northwestern Quebec, Canada. Mapped forest stands were classified according to a conceptual cohort model of stand development based on species composition and other stand attributes. Contiguous forest stands of the same cohort class were agglomerated to form relatively uniform patches containing a single cohort class. Landscape spatial structure was defined using four landscape characterization indices: proportion of the landscape, mean patch size, mean distance to nearest neighbour and mean patch shape index. Cohort 1 patches occurred as both small and large units that had complex shapes while Cohort 2 patches occurred as small dispersed units that had simple shapes. Cohort 3 patches dominated the landscape matrix and formed both small and large units that were generally agglomerated in the same vicinity. Our cohort classification of mapped stand polygons was validated by comparing the proportion of land occupied by each cohort in two natural fires (1923 and 1760) that have shaped this area. Theoretical local targets for maintaining cohort structure in the landscape were then formulated based on these historical landscape characteristics.Keywords: landscape analysis, forest cohorts, temporal and spatial variability of forest, forest management objectives, ecosystem management résumé Le maintien de la structure spatiale des forêts est de plus en plus reconnu comme un outil de gestion pertinent pour le maintien de la biodiversité. Dans cette étude, nous utilisons des cartes d'inventaire forestier datant de 1965, 1972, 1983 et 1994 pour décrire la structure spatiale historique récente du paysage à la Forêt d' enseignement et de recherche du Lac Duparquet dans le nord-ouest du Québec, Canada. Le couvert forestier fut décrit en utilisant un modèle de « cohorte » de développement des peuplements forestiers basé sur la composition et d'autres attributs de peuplement. Les peuplements forestiers contigus ayant été associés à la même classe de cohorte furent agglomérées en « patches » de cohorte relativement uniformes. La structure spatiale du paysage fut définie en utilisant quatre indices de paysage : la proportion du paysage occupée, la taille moyenne, la distance moyenne du plus proche voisin et la forme moyenne pour les agglomérations de peuplements d'une même cohorte. Les agglomérations de peuplements de la cohorte 1 étaient soit petites ou grandes et avaient des formes complexes. Les agglomérations de peuplements de la Cohorte 2 étaient petites, dispersées et avec une forme simple. Les peuplements de la Cohorte 3 constituaient la matrice du paysage et se trouvaient en petites et grandes agglomérations. Notre classification de polygones forestiers en coh...

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The spatial pattern of a northern conifer-hardwood landscape

Cited by 105 publications

References 16 publications

Presettlement landscape heterogeneity: Evaluating grain of resolution using General Land Office Survey data

Presettlement landscape heterogeneity: Evaluating grain of resolution using General Land Office Survey data

Hydro-Geomorphic Classification and Potential Vegetation Mapping for Upper Mississippi River Bottomland Restoration

Historical analysis of landscape change in the eastern boreal mixedwood: A case study in the context of cohort-based management

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