A comparison of digital and film fisheye photography for analysis of forest canopy structure and gap light transmission

Frazer, Gordon W.; Fournier, Richard; Trofymow, J. A.; Hall, Ronald J.

doi:10.1016/s0168-1923(01)00274-x

Cited by 379 publications

(336 citation statements)

References 22 publications

Supporting

Mentioning

313

Contrasting

Unclassified

Order By: Relevance

“…Canopy openness in each plot was measured using hemispherical photographs (Frazer et al 2001), taken with a Nikon Coolpix 4500 camera with a fi sh-eye FC-E8 lens. We positioned the camera, with the aid of a tripod, at an approximate 60 cm height, at the centre of each plot.…”

Section: Vegetation Surveymentioning

confidence: 99%

“…We positioned the camera, with the aid of a tripod, at an approximate 60 cm height, at the centre of each plot. Photographs were taken in cloudy days to avoid over exposure to direct sunlight, which may infl uence image analysis (Frazer et al 2001). We converted the resulting images in black and white colours in ImageJ software (2015).…”

Section: Vegetation Surveymentioning

confidence: 99%

See 1 more Smart Citation

Pathways affect vegetation structure and composition in the Atlantic Forest in southeastern Brazil

et al. 2017

View full text Add to dashboard Cite

Although impacts generated by gaps can aff ect vegetation, few studies have addressed these impacts in the Atlantic Forest. Our aim was to investigate the eff ects of pathways of varying widths on vegetation structure and composition, considering dispersal syndromes, diversity, life forms, successional categories and threatened and exotic species occurrence in the Atlantic Forest. We studied three pathways with widths of 2, 10 and 20 m, intersecting a protected area in southeastern Brazil. To assess edge eff ects, plots were established adjacent to paths (edge) and 35 m from the edge (neighborhood), and in a control area without pathways. Wider pathways (10 and 20 m) exhibited reduced tree height and diameter, high liana density, exotic species, and a high proportion of pioneer and anemochorous species. In conclusion, our results indicate that the vegetation structure of narrow pathways (2 m) is similar to the control area, and that wide linear gaps cause negative eff ects on vegetation and extend to a distance of at least 35 m into the forest interior. Considering that linear gaps generate permanent eff ects to vegetation and may aff ect other organisms, we suggest that these eff ects must be considered for successful management of protected areas, including planning and impact mitigation.

show abstract

Section: Vegetation Surveymentioning

confidence: 99%

Section: Vegetation Surveymentioning

confidence: 99%

Pathways affect vegetation structure and composition in the Atlantic Forest in southeastern Brazil

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Their recommendation is not advocated here and should not be followed by anyone with the capability to store images at high resolution. Digital images have lower definition under some conditions compared to film imagery (Frazer et al, 2001), and these inaccuracies are exacerbated with low quality images.…”

Section: Par and Canopy Structurementioning

confidence: 99%

“…The manufacturers specifications of lens distortion used by HemiView had been previously shown to be sufficient (Frazer et al, 2001) and were used without modification.…”

Section: Figure 8: (Left) Original Hemispherical Images and (Right) Mmentioning

confidence: 99%

Epiphytic bryophytes and habitat variation in montane rainforest, Peru

Romanski¹,

Pharo

Kirkpatrick³

2011

The Bryologist

View full text Add to dashboard Cite

A total of 190 holoepiphytic and 5 hemiepiphytic vascular plant species were collected from the canopy and the trunk of an emergent Ficus L. species host that is common to a Peruvian cloud forest. One hundred and fourteen of the vascular epiphyte species were orchids. A large majority of the vascular species were rare in occurrence. Vascular epiphyte diversity and density was highest in the outer canopy zone of the host crown. In the inner canopy zone there was a dearth of epiphytes, attributed to a high rate of epiphyte slumping on the smooth-barked branches. The trunk had a different suit of species to those found in the canopy.During the wet season, the thickening of epiphytic matter in the outer canopy zone appeared to contribute to a large amelioration of daytime and nocturnal temperatures through evaporation and heat retention respectively.Nocturnal temperatures were highest in the outer canopy zone, and were lowest on the forest floor. The latter was attributed to the downward flow of the product of radiative cooling as a result of the heterogeneous canopy on the steep slope.Epiphyte clumps appear to slump before competition causes the loss of early successional species. Some species showed a preference for more shaded epiphyte clumps and many were more frequent on smaller branch diameters. Most species showed a moderately high niche overlap with a large number of other species, which suggested a high degree of species coexistence.Epiphyte slumping is suggested to be the major driving mechanism for the maintenance of non-equilibrium in the community. Aspects of the phenologies of epiphytes, age-structure of the community and high environmental variation could be other mechanisms for the maintenance of a high degree of species coexistence.iii

show abstract

“…Hemispherical canopy photography is widely used to assess light conditions (Chazdon and Field 1987, Rich 1989, Rich et al 1993, Frazer et al 2001. Hemispherical photographs were taken in October 2011, before planting, about half a year after logging.…”

Section: Hemispherical Photographymentioning

confidence: 99%

Effects of logging and line planting treatment on canopy openness in logged-over forests in Bornean lowland dipterocarp forest

Inada

Ano

Hardiwinoto

et al. 2013

Tropics

View full text Add to dashboard Cite

In logged-over forests, altered light conditions with logging induce pioneer species invasion and reduce commercial value. In Indonesia, reduced impact logging (RIL) methods have been applied to mitigate the logging effects, and line planting of useful species has been conducted in some production forests. However, quantitative assessments of canopy openings during RIL and line planting treatment are insufficient. Line plating involves 3-m strip cutting lines. The effects of these methods on canopy openness are poorly understood. This study assessed the effects of different logging systems on light conditions using hemispherical photographs taken in plots set in primary forests, forest logged over using RIL, and forest treated with strip cutting after RIL. Photographs were also taken along strip cutting lines. The comparison of canopy openness among the three types of sites revealed that logging activities had significant effects on light condition. High levels of canopy openness were found along skid trails and logging gaps following the trails. Therefore reducing the impact on light conditions should be considered when planning skid trails. Between the logged-over forest plots with and without the strip cutting lines, there was no significant difference in the mean canopy openness. However, strip cutting treatment affected to sun fleck duration in the forest floor. It might influence to following dynamics. And there were large differences in canopy openness along each line which would cause variations in the growth of planted trees.

show abstract

A comparison of digital and film fisheye photography for analysis of forest canopy structure and gap light transmission

Cited by 379 publications

References 22 publications

Pathways affect vegetation structure and composition in the Atlantic Forest in southeastern Brazil

Pathways affect vegetation structure and composition in the Atlantic Forest in southeastern Brazil

Epiphytic bryophytes and habitat variation in montane rainforest, Peru

Effects of logging and line planting treatment on canopy openness in logged-over forests in Bornean lowland dipterocarp forest

Contact Info

Product

Resources

About