EurekaMag.com logo
+ Translate

Estimation of tree canopy leaf area index by gap fraction analysis


, : Estimation of tree canopy leaf area index by gap fraction analysis. Forest Ecology & Management 61(1-2): 91-108

We estimated leaf area index (LAI) in a needle-leaved forest and a broad-leaved orchard using four instruments which measure fractional light penetration through the canopy. Gap fraction data were analyzed by a one-dimensional inversion model or by using the Beer-Lambert Law. Instrument and analytical technique both had a strong influence on calculated LAI. There was no consistent pattern of LAI results among instruments so no simple cross-calibration can be offered. Three of the four instruments accurately estimated orchard LAI when used with one or the other analytical technique. In addition to performance, practical considerations including cost, sampling, and data analysis were also compared among the instruments. Because the instruments do not provide consistently accurate LAI estimates, LAI should be independently corroborated before use in any particular situation. These instruments may be most useful for relative LAI comparisons in a specific canopy type when a single combination of instrument and analytical technique is employed.

Accession: 002373505

DOI: 10.1016/0378-1127(93)90192-P

Download PDF Full Text: Estimation of tree canopy leaf area index by gap fraction analysis


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Related references

Maire,G.le; Francois,C.; Soudani,K.; Berveiller,D.; Pontailler,J.Y.; Breda,N.; Genet,H.; Davi,H.; Dufrene,E., 2008: Calibration and validation of hyperspectral indices for the estimation of broadleaved forest leaf chlorophyll content, leaf mass per area, leaf area index and leaf canopy biomass. This article aims at finding efficient hyperspectral indices for the estimation of forest sun leaf chlorophyll content (CHL, micro g cm<sub>leaf</sub><sup>-2</sup>), sun leaf mass per area (LMA, g<sub>dry matter</s...

Goel, N.S.; Thompson, R.L., 1984: Inversion of vegetation canopy reflectance models for estimating agronomic variables 5. estimation of leaf area index and average leaf angle using measured canopy reflectances. A technique for estimating agronomic parameters from bidirectional crop reflectance data is applied to a fully covered soybean canopy, using field data measurements. This technique employs the inversion of a canopy reflectance model. Using the SAI...

Herbert, D.A.; Fownes, J.H., 1997: Effects of leaf aggregation in a broad-leaf canopy on estimates of leaf area index by the gap-fraction method. -We compared leaf area index (LAI) estimates of a broad-leaf tropical hardwood, Metrosideros polymorpha Gaud ('Ohi'a), using an optical method (LI-COR LAI-2000) and direct determination (harvest and allometry). There was a strong correla...

Antunes, Mauro-Antonio-Homem, 1997: A vegetation canopy radiative transfer model and its use to estimate canopy leaf area index and absorbed fraction of photosynthetically active radiation

Zhao, D.; Xie, D.; Zhou, H.; Jiang, H.; An, S., 2013: Estimation of leaf area index and plant area index of a submerged macrophyte canopy using digital photography. Non-destructive estimation using digital cameras is a common approach for estimating leaf area index (LAI) of terrestrial vegetation. However, no attempt has been made so far to develop non-destructive approaches to LAI estimation for aquatic vege...

Goel, N.S.; Thompson, R.L., 1984: Inversion of vegetative canopy reflectance models for estimating agronomic variables. V. Estimation of leaf area index and average leaf angle using measured canopy reflectance. A description is given of how bidirectional canopy reflectance data from a soyabean canopy can be used to estimate LAI and av. leaf angle. The estimation procedure involved the inversion of a canopy reflectance model entitled SAIL. Suggestions for...

Cao, S.; Liu, X-Nan.; Liu, M-Ling.; Cao, S.; Yao, S., 2014: Estimation of leaf area index by normalized composite vegetation index fusing the spectral feature of canopy water content. The accurate inversion of leaf area index (LADI) in canopy is very important for guiding crop management and assessing crop yield. Sixty samples belonging to corn in four different areas of Jilin City were scanned by ASD field pro3 and LAI-2000 fo...

Park, H.K.; Choi, W.Y.; Back, N.H.; Kim, S.S.; Kim, B.K.; Kim, K.K., 2004: Estimation of leaf area index by plant canopy analyzer in rice. A study was conducted to estimate of the leaf area index (LAI) rapidly using a plant canopy analyser, and compare with specific leaf area (SLA) and leaf area ratio (LAR) in rice from 2001 to 2002 at the Honam Agricultural Research Institute in Iks...

Wei, X.Z., 1988: A method for estimation of vertical distribution of leaf area index in wheat canopy. A mathematical model is presented for the quantitative description of plant habit on the basis of measurements of height, ear length, peduncle and basal internode length and stem diameter. The model is thought suitable for determining leaf area in...

Yamamoto, H.; Suzuki, Y.; Hayakawa, S., 1995: Estimation of leaf area index in crop canopies using plant canopy analyzer. Japanese Journal of Crop Science 64(2): 333-335