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Pygmaclypeatus daziensis, a unique lower Cambrian arthropod with two different compound eye systems. [PDF]
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Algal-bacterial consortium promotes carbon sink formation in saline environment. [PDF]
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Comparison of film and digital hemispherical photography across a wide range of canopy densities
Agricultural and Forest Meteorology, 2002Hemispherical photography is a widely used method for assessing the light environment beneath forest canopies. As technology advances, digital photography is expected to increasingly replace conventional film photography for such work. However, in the absence of satisfactory comparisons between the two methods, caution is needed in the use of a digital
Sophie E Hale, Colin Edwards
exaly +2 more sources
Agricultural and Forest Meteorology, 2013
Abstract Rapid, reliable and meaningful estimates of forest canopy are essential to the characterization of forest ecosystems. In this paper the accuracy of digital hemispherical (DHP) and cover (DCP) photography for the estimation of canopy properties in deciduous forests was evaluated.
Francesco Chianucci, Andrea Cutini
exaly +3 more sources
Abstract Rapid, reliable and meaningful estimates of forest canopy are essential to the characterization of forest ecosystems. In this paper the accuracy of digital hemispherical (DHP) and cover (DCP) photography for the estimation of canopy properties in deciduous forests was evaluated.
Francesco Chianucci, Andrea Cutini
exaly +3 more sources
Assessment of automatic gap fraction estimation of forests from digital hemispherical photography
Agricultural and Forest Meteorology, 2005Thresholding is a central part of the analysis of hemispherical images in terms of gap fraction and leaf area index (LAI), and the selection of optimal thresholds has remained a challenge over decades. The need for an objective, automatic, operatorindependent thresholding method has long been of interest to scientists using hemispherical photography ...
Bart Muys, Inge Jonckheere
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Agricultural and Forest Meteorology, 2014
Digital hemispherical photography (DHP) has been widely used to estimate the plant area index (PAI, a surrogate for leaf area index, LAI) for terrestrial vegetation. However, DHP has not been applied in aquatic environment fields for submerged vegetation, where only a few methods are available for LAI measurement.
Shuqing An, Dehua Zhao, Penghe Wang
exaly +2 more sources
Digital hemispherical photography (DHP) has been widely used to estimate the plant area index (PAI, a surrogate for leaf area index, LAI) for terrestrial vegetation. However, DHP has not been applied in aquatic environment fields for submerged vegetation, where only a few methods are available for LAI measurement.
Shuqing An, Dehua Zhao, Penghe Wang
exaly +2 more sources
Agricultural and Forest Meteorology, 2004
Digital hemispherical photography is an effective device for estimating the light environment beneath a forest canopy. In this study, the effects of different image quality, size and camera type on the light environment estimates using digital hemispherical photography were examined.
Akio Inoue, Nobuya Mizoue
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Digital hemispherical photography is an effective device for estimating the light environment beneath a forest canopy. In this study, the effects of different image quality, size and camera type on the light environment estimates using digital hemispherical photography were examined.
Akio Inoue, Nobuya Mizoue
exaly +2 more sources
Canadian Journal of Forest Research, 2000
This study presents the results of a comparison of digital and film hemispherical photography as means of characterizing forest light environments and canopy openness. We also compared hemispherical photography to spherical densiometry. Our results showed that differences in digital image quality due to the loss of resolution that occurred when images
David Clark
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This study presents the results of a comparison of digital and film hemispherical photography as means of characterizing forest light environments and canopy openness. We also compared hemispherical photography to spherical densiometry. Our results showed that differences in digital image quality due to the loss of resolution that occurred when images
David Clark
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Canadian Journal of Forest Research, 2015
Optical methods have been widely used to estimate seasonal changes of the leaf area index (LAI) in forest stands because they are convenient and effective; however, their accuracy in deciduous broadleaf forests has rarely been evaluated. We estimate the seasonal changes in the LAI by combining periodic observations of leaf area variation with litter ...
Zhili Liu, Xingchang Wang, Jing Chen
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Optical methods have been widely used to estimate seasonal changes of the leaf area index (LAI) in forest stands because they are convenient and effective; however, their accuracy in deciduous broadleaf forests has rarely been evaluated. We estimate the seasonal changes in the LAI by combining periodic observations of leaf area variation with litter ...
Zhili Liu, Xingchang Wang, Jing Chen
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Forest Ecology and Management, 2015
Abstract Accurate estimation of seasonal leaf area index (LAI) variations is essential for predicting forest growth, but rapid and reliable methods for obtaining such estimates have rarely been reported. In this study, direct measurements of LAI seasonal variations in deciduous broadleaf forests in China were made through leaf seasonality ...
Zhili Liu, Xingchang Wang, Jing Chen
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Abstract Accurate estimation of seasonal leaf area index (LAI) variations is essential for predicting forest growth, but rapid and reliable methods for obtaining such estimates have rarely been reported. In this study, direct measurements of LAI seasonal variations in deciduous broadleaf forests in China were made through leaf seasonality ...
Zhili Liu, Xingchang Wang, Jing Chen
exaly +2 more sources