Sampling Strategies for Natural Resources and the Environment

Grégoire, Timothy G.; Valentine, Harry T.

doi:10.1201/9780203498880

Cited by 250 publications

(240 citation statements)

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“…Gregoire and Valentine 2008). Table 1 shows the number of plots in the Swedish NFI required to provide a 3 certain precision of area estimate within a pest or disease outbreak area, provided that the true area proportion of 4 damages within the outbreak area is five percent.…”

Section: Appendix 1 Required Sample For a Given Precisionmentioning

confidence: 99%

Adapting forest health assessments to changing perspectives on threats—a case example from Sweden

Wulff

Lindelöw

Lundin

et al. 2011

Environ Monit Assess

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Section: Appendix 1 Required Sample For a Given Precisionmentioning

confidence: 99%

Adapting forest health assessments to changing perspectives on threats—a case example from Sweden

Wulff

Lindelöw

Lundin

et al. 2011

Environ Monit Assess

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“…To this purpose, the estimate of the abundance Nkl of the tree species k in the stand l was necessary for each species and each stand. The abundance estimate of a species in the stand was achieved adopting the Horvitz-Thompson criterion, which in the case of plot sampling reduced to Nkl = AlXkl / n la l , where Al was the size of the stand l, a l was the size of each sampling plot and Xkl was the total number of stems of species k observed within the n l plots [24]. From the abundance estimates of the K tree species, the abundance of the whole stand l was given Nl = N1l + … + NKl, from which the relative abundance estimate of each species was pkl = Nkl / Nl.…”

Section: Methodsmentioning

confidence: 99%

Tree Community Ordering by Diversity Profiles: an Application to Chestnut Coppices

Mattioli¹

2014

Forest Res

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SummaryThe ecological and economical relevance of sweet chestnut (Castanea sativa Mill.) has long been related to its widespread geographical distribution and multipurpose product potential. In Italy, chestnut management represents a paradigmatic example of the potential conflict between landowner targets and tree species diversity conservation. Distinctively, the relationships between silvicultural treatment and tree species diversity of chestnut coppices are here investigated by means of diversity profiles to assess tree diversity of six stands in Central Italy. The stands were purposively selected in such a way to be characterized by the same site conditions but with different silvicultural features (age, number of thinning). Plot sampling was performed across the stands and their tree diversity was compared and ordered by means of intrinsic diversity profiles estimated from the sample data. The achieved results suggest alternative suitable options for managing chestnut coppice stands in order to enhance tree biodiversity while maintaining timber production.

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“…Each plot was topographically classified as valley floor, foothill, slope, upper slope or mountain ridge. The basal area of the growing stock was determined using angle count samples (basal area factor 1) (Zöhrer 1980;Kramer, Akca 1982;Gregoire, Valentine 2008). The species, diameter class (1.3 m from the ground, in 10 cm intervals), vitality (alive, dying, dead), and visible damage (fire, windfall, rot) were recorded for each tree.…”

Section: Methodsmentioning

confidence: 99%

Structure of the montane taiga forests of West Khentii, Northern Mongolia

Mühlenberg¹,

Appelfelder²,

Hoffmann³

et al. 2012

J. For. Sci.

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Studies were undertaken to investigate the composition, structure and diversity of four different types of North Mongolian montane forest near the southern border of the taiga. These forest types, classified as willow-poplar, larch-birch, spruce-fir and Siberian-pine forests, were found to be significantly different with respect to the elevational gradient. In the study area, two fire regimes could be distinguished at lower and drier elevations, frequent surface fires resulted in less diverse forests comprising coniferous species, which in their adult form were found to be fire-resistant, burn-colonizing and light-demanding deciduous tree species. In contrast, the forests colonizing the moist, higher elevations and shaded slopes had a higher diversity of tree species with greater basal area, higher proportion of deadwood, and more regenerating trees; here the coniferous shade trees experienced infrequent but destructive treetop fires. Overall, our results showed that the four forest types differed in composition according to the tree species, diameter and height classes.    

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Sampling Strategies for Natural Resources and the Environment

Cited by 250 publications

References 0 publications

Adapting forest health assessments to changing perspectives on threats—a case example from Sweden

Adapting forest health assessments to changing perspectives on threats—a case example from Sweden

Tree Community Ordering by Diversity Profiles: an Application to Chestnut Coppices

Structure of the montane taiga forests of West Khentii, Northern Mongolia

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