A note on the slope correction and the estimation of the length of line features

Kleinn, Christoph; Traub, Berthold; Hoffmann, Christian

doi:10.1139/x02-004

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…The slope and aspect were measured from the center of the plots. The slopes were corrected using the formula r' = r/cos 2 (a/2.1) as per [20], where r' is the corrected radius, r is a radius on the horizontal plane (5.64 m) and a is the slope angle. It was carried out so that the areas of the plots were not underestimated in slopy areas.…”

Section: Data Collection Methods and Data Analysismentioning

confidence: 99%

Abundance, Distribution and Association of Paphiopedilum fairrieanum (Lindl.) Stein with Site Factors in Brongshing, Samdrup Jongkhar District

Wangchuk

Dorji

2022

Conservation

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The long-lived and attractive flower of Paphiopedilum fairrieanum (Lindl.) Stein has made it one of the most commercialized flowers in the world, and its distribution is restricted to small areas. Thus, it was listed as a critically endangered orchid species by the IUCN in 2015. Therefore, the aim of this study was to generate information on the abundance and distribution of Paphiopedilum fairrieanum and assess the relationship between the abundance and distribution of Paphiopedilum fairrieanum with site factors in the study area. A systematic sampling method was followed for the data collection, with a 200 m distance between the plots. A total of 34 sample plots with 5.64 m radii were established. In total, 1004 individuals of orchid species were recorded. The abundance and distribution of the Paphiopedilum fairrieanum showed statistically significant associations with the elevation (r = −0.350, p = 0.042), slope (r = 0.666, p = 0.000), precipitation (r = −0.630, p = 0.000) and temperature (r = 0.371, p = 0.031). A southeast aspect was found to have the highest number of Paphiopedilum fairrieanum, and a northwest aspect had the least. The findings of this study would help researchers to find suitable sites and the distribution of Paphiopedilum fairrieanum in unexplored areas.

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Section: Data Collection Methods and Data Analysismentioning

confidence: 99%

Abundance, Distribution and Association of Paphiopedilum fairrieanum (Lindl.) Stein with Site Factors in Brongshing, Samdrup Jongkhar District

Wangchuk

Dorji

2022

Conservation

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“…Rectangular sampling plots, each with an area of 500 m 2 (25 m × 20 m) were established at each study site based on Nepal's National Inventory Guideline [57]. Slope correction was carried out for plots on slopes with gradients of >10%, as slope correction is mainly applied for slopes exceeding 10% [58]. Slope angle was measured using a clinometer.…”

Section: Data Collectionmentioning

confidence: 99%

Forest Structure and Composition under Contrasting Precipitation Regimes in the High Mountains, Western Nepal

et al. 2021

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The high mountains stretch over 20.4% of Nepal’s land surface with diverse climatic conditions and associated vegetation types. An understanding of tree species and forest structural pattern variations across different climatic regions is crucial for mountain ecology. This study strived to carry out a comparative evaluation of species diversity, main stand variables, and canopy cover of forests with contrasting precipitation conditions in the Annapurna range. Firstly, climate data provided by CHELSA version 1.2, were used to identify distinct precipitation regimes. Lamjung and Mustang were selected as two contrasting precipitation regions, and have average annual precipitation of 2965 mm and 723 mm, respectively. Stratified random sampling was used to study 16 plots, each measuring 500 m2 and near the tree line at an elevation range of 3000 to 4000 m across different precipitation conditions. In total, 870 trees were identified and measured. Five hemispherical photos using a fisheye lens were taken in each plot for recording and analyzing canopy cover. Margalef’s index was used to measure species richness, while two diversity indices: the Shannon–Wiener Index and Simpson Index were used for species diversity. Dominant tree species in both study regions were identified through the Important Value Index (IVI). The Wilcoxon rank-sum test was employed to determine the differences in forest structure and composition variables between the two precipitation regimes. In total, 13 species were recorded with broadleaved species predominating in the high precipitation region and coniferous species in the low precipitation region. Higher species richness and species diversity were recorded in the low precipitation region, whereas the main stand variables: basal area and stem density were found to be higher in the high precipitation region. Overall, an inverse J-shaped diameter distribution was found in both precipitation regions signifying uneven-aged forest. A higher proportion of leaning and buttressed trees were recorded in the high precipitation region. However, similar forest canopy cover conditions (>90%) were observed in both study regions. The findings of this research provide a comprehensive narrative of tree species and forest structure across distinct precipitation regimes, which can be crucial to administrators and local people for the sustainable management of resources in this complex region.

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“…Finally, because all plots were measured in the field with the same radius for plot areas, a correction factor was applied to compensate for differences in slope ( = ( ) . , r = new plot radius, α = slope,Kleinn et al 2002).…”

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confidence: 99%

An analysis of coastal temperate old forest residual carbon, structure and understory plant floristics after wildfire

Boxwell¹

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I assessed some coastal temperature old-growth forests of southwestern British Columbia to understand their post-wildfire structure, carbon storage and biodiversity values. I used a remotely sensed relativized burn ratio and a composite burn index to compare measures of aboveground carbon, structural complexity and floristic diversity between burned and unburned reference plots years after four large wildfires. The unburned reference plots represented the natural range of variation of old growth values. In burned plots, 21 of 60 retained carbon values and 10 plots retained structural values similar to unburned old growth plots. There was an average of 12% floristic similarity between burned and unburned understory plant communities.

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A note on the slope correction and the estimation of the length of line features

Cited by 7 publications

References 6 publications

Abundance, Distribution and Association of Paphiopedilum fairrieanum (Lindl.) Stein with Site Factors in Brongshing, Samdrup Jongkhar District

Abundance, Distribution and Association of Paphiopedilum fairrieanum (Lindl.) Stein with Site Factors in Brongshing, Samdrup Jongkhar District

Forest Structure and Composition under Contrasting Precipitation Regimes in the High Mountains, Western Nepal

An analysis of coastal temperate old forest residual carbon, structure and understory plant floristics after wildfire

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