FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2053375325> ?p ?o ?g. }

• W2053375325 endingPage "29473" @default.
• W2053375325 startingPage "29455" @default.
• W2053375325 abstract "A new method for measuring plant canopy nonrandomness and other architectural components has been developed using a 16 bit (65535 gray scale levels) charged‐coupled device (CCD) camera that captures images of plant canopies in two wavelength bands. This complete system is referred to as a multiband vegetation imager (MVI). The use of two wavelength bands (visible (VIS) 400–620 nm and near infrared (NIR) 720–950 nm) permits identification of sunlit and shaded foliage, sunlit and shaded branch area, clouds, and blue sky based on the camera's resolution, and the varying spectral properties that scene components have in the two wavelength bands. This approach is different from other canopy imaging methods (such as fish‐eye photography) because it emphasizes measuring the fraction of an image occupied by various scene components (branches, shaded leaves, sunlit leaves) under different sky conditions rather than simply the canopy gap fraction under uniform sky conditions. The MVI has been used during the Boreal Ecosystem‐Atmosphere Study (BOREAS) in aspen ( Populus tremuloides ) and balsam poplar ( Populus balsamifera ) to estimate architectural characteristics of each canopy. The leaf area index (LAI), sunlit LAI, and degree of nonrandomness within a canopy are architectural properties that have been measured with the MVI. Using a crown‐based Monte Carlo model for nonrandom canopies, nonrandomness factors are calculated from MVI data using two approaches (gap fraction and gap‐size distribution theories) to correct total and sunlit LAI estimates from indirect methods that assume random foliage distributions. Canopy nonrandomness factors obtained from analyzing the gap‐size distribution in a Monte Carlo model are shown to be a function of path length (angle) through the canopy (Ω e (θ)); thus we suggest that LAI‐2000 indirect measurements of LAI be adjusted with the value of Ω e (θ) at θ=35° because this is the mean angle at which the canopy gap fraction is measured by the LAI‐2000. In this study, values of Ω e (35)=0.69 in an aspen forest. Alternatively, corrections to indirect LAI measurements obtained with the MVI in this study are made using the value of Ω e (0) because the MVI is used to measure the canopy gap‐size distribution and gap fraction within 15° of the zenith. Values of Ω e (0) obtained with the MVI in aspen are typically between 0.55 and 0.65; while in balsam poplar, average values of Ω e (0) are equal to 0.82. This study shows that the MVI provides an attractive indirect measurement technique to obtain accurate estimates of total LAI in aspen. Corrected canopy LAI and direct LAI measurements are greater than indirect estimates based on assuming the foliage to be randomly distributed: In aspen, total LAI is 45% larger (3.3 versus 2.0) and sunlit LAI (40° Sun zenith angle) 10% larger, while in balsam poplar, total LAI is 17% larger (2.3 versus 1.9) and sunlit LAI is only 1% larger. The importance of these clumping characteristics is best appreciated with estimates of canopy net CO 2 assimilation derived from scaling leaf photosynthesis versus light relations. Aspen canopy assimilation accounting for clumping is 39% larger than estimates based on indirect measurements of total LAI and the assumption that foliage is randomly distributed." @default.
• W2053375325 created "2016-06-24" @default.
• W2053375325 creator A5022775925 @default.
• W2053375325 creator A5043390184 @default.
• W2053375325 creator A5066379267 @default.
• W2053375325 creator A5078640913 @default.
• W2053375325 date "1997-12-01" @default.
• W2053375325 modified "2023-09-27" @default.
• W2053375325 title "Characterizing canopy nonrandomness with a multiband vegetation imager (MVI)" @default.
• W2053375325 cites W1963623641 @default.
• W2053375325 cites W1977556410 @default.
• W2053375325 cites W1982818815 @default.
• W2053375325 cites W1990644176 @default.
• W2053375325 cites W1995103915 @default.
• W2053375325 cites W2002471098 @default.
• W2053375325 cites W2015916222 @default.
• W2053375325 cites W2017208387 @default.
• W2053375325 cites W2026307199 @default.
• W2053375325 cites W2046865483 @default.
• W2053375325 cites W2048163075 @default.
• W2053375325 cites W2048852284 @default.
• W2053375325 cites W2067463158 @default.
• W2053375325 cites W2094158326 @default.
• W2053375325 cites W2095897464 @default.
• W2053375325 cites W2125747590 @default.
• W2053375325 cites W2135817270 @default.
• W2053375325 cites W2500082804 @default.
• W2053375325 cites W2981395174 @default.
• W2053375325 doi "https://doi.org/10.1029/97jd01175" @default.
• W2053375325 hasPublicationYear "1997" @default.
• W2053375325 type Work @default.
• W2053375325 sameAs 2053375325 @default.
• W2053375325 citedByCount "120" @default.
• W2053375325 countsByYear W20533753252012 @default.
• W2053375325 countsByYear W20533753252013 @default.
• W2053375325 countsByYear W20533753252014 @default.
• W2053375325 countsByYear W20533753252015 @default.
• W2053375325 countsByYear W20533753252016 @default.
• W2053375325 countsByYear W20533753252017 @default.
• W2053375325 countsByYear W20533753252018 @default.
• W2053375325 countsByYear W20533753252019 @default.
• W2053375325 countsByYear W20533753252020 @default.
• W2053375325 countsByYear W20533753252021 @default.
• W2053375325 countsByYear W20533753252022 @default.
• W2053375325 crossrefType "journal-article" @default.
• W2053375325 hasAuthorship W2053375325A5022775925 @default.
• W2053375325 hasAuthorship W2053375325A5043390184 @default.
• W2053375325 hasAuthorship W2053375325A5066379267 @default.
• W2053375325 hasAuthorship W2053375325A5078640913 @default.
• W2053375325 hasConcept C101000010 @default.
• W2053375325 hasConcept C142724271 @default.
• W2053375325 hasConcept C153294291 @default.
• W2053375325 hasConcept C166957645 @default.
• W2053375325 hasConcept C18903297 @default.
• W2053375325 hasConcept C205649164 @default.
• W2053375325 hasConcept C25989453 @default.
• W2053375325 hasConcept C2776133958 @default.
• W2053375325 hasConcept C39432304 @default.
• W2053375325 hasConcept C62649853 @default.
• W2053375325 hasConcept C71924100 @default.
• W2053375325 hasConcept C73329638 @default.
• W2053375325 hasConcept C86803240 @default.
• W2053375325 hasConceptScore W2053375325C101000010 @default.
• W2053375325 hasConceptScore W2053375325C142724271 @default.
• W2053375325 hasConceptScore W2053375325C153294291 @default.
• W2053375325 hasConceptScore W2053375325C166957645 @default.
• W2053375325 hasConceptScore W2053375325C18903297 @default.
• W2053375325 hasConceptScore W2053375325C205649164 @default.
• W2053375325 hasConceptScore W2053375325C25989453 @default.
• W2053375325 hasConceptScore W2053375325C2776133958 @default.
• W2053375325 hasConceptScore W2053375325C39432304 @default.
• W2053375325 hasConceptScore W2053375325C62649853 @default.
• W2053375325 hasConceptScore W2053375325C71924100 @default.
• W2053375325 hasConceptScore W2053375325C73329638 @default.
• W2053375325 hasConceptScore W2053375325C86803240 @default.
• W2053375325 hasIssue "D24" @default.
• W2053375325 hasLocation W20533753251 @default.
• W2053375325 hasOpenAccess W2053375325 @default.
• W2053375325 hasPrimaryLocation W20533753251 @default.
• W2053375325 hasRelatedWork W1986010464 @default.
• W2053375325 hasRelatedWork W1998002922 @default.
• W2053375325 hasRelatedWork W2015452551 @default.
• W2053375325 hasRelatedWork W2067703153 @default.
• W2053375325 hasRelatedWork W2100007397 @default.
• W2053375325 hasRelatedWork W2139387783 @default.
• W2053375325 hasRelatedWork W2148467091 @default.
• W2053375325 hasRelatedWork W2161527913 @default.
• W2053375325 hasRelatedWork W2162298841 @default.
• W2053375325 hasRelatedWork W2306632474 @default.
• W2053375325 hasVolume "102" @default.
• W2053375325 isParatext "false" @default.
• W2053375325 isRetracted "false" @default.
• W2053375325 magId "2053375325" @default.
• W2053375325 workType "article" @default.