Results 311 to 320 of about 338,609 (329)

Tillering and leaf area index in grasses in the vegetative phase

Grass and Forage Science, 1987
AbstractThe relationship between tillering of a vegetative grass stand and Leaf Area Index (LAI) has been studied during sward establishment of perennial ryegrass and Italian ryegrass with different seedling densities and nitrogen fertilizer rates and on established swards of tall fescue during winter and early spring after different dates of last cut ...
Simon, J.C., Lemaire, G.
openaire   +4 more sources

Conversion of total to projected leaf area index in conifers [PDF]

Canadian Journal of Botany, 2000
Several definitions of leaf area index (LAI) presently exist in the literature but the relationships among them are not clear. To compare the results of various studies, there is a need to convert from one definition to another. Factors for converting among four definitions of LAI are presented for six conifer species: Abies grandis (Dougl. ex D. Don)
Doug Goodman, Hugh J. Barclay
openaire   +1 more source

Leaf Area Index

2008
International ...
openaire   +3 more sources

Leaf area index mapping in northern Canada

International Journal of Remote Sensing, 2011
In this study, a new LAI algorithm was developed with particular emphasis over northern Canada using a much finer resolution of remotely sensed data and in situ measurements collected over a wide range of northern arctic vegetation. A statistical relationship was developed between the in situ LAI measurements collected over vegetation plots in northern
Abdelgadir Abuelgasim, Sylvain G. Leblanc   +1 more
openaire   +2 more sources

Sampling protocols of specific leaf area for improving accuracy of the estimation of forest leaf area index

Agricultural and Forest Meteorology, 2021
Abstract Litterfall collection is a non-destructive direct method to estimate forest leaf area index (LAI) and validate indirect LAI products. However, the potential errors associated with the variation in specific leaf area (SLA) are rarely explored. Here, we measured the SLA of leaf litter for each tree species in a temperate deciduous forest using
Chuankuan Wang, Fan Liu, Xingchang Wang
openaire   +2 more sources

An Approach for Indirect Determination of Leaf Area Index

Transactions of the ASABE, 2019
Abstract. Leaf area index (LAI) is important in crop models, but determination of LAI can be challenging for crops and mixtures of crops. The purpose of this study was to determine LAI indirectly from ground cover (determined from photographic images) and canopy height using defined relationships based on crop coefficients.
Cindy A. Cambardella, Sally D. Logsdon
openaire   +2 more sources

Simple method for retrieving leaf area index from Landsat using MODIS leaf area index products as reference

Journal of Applied Remote Sensing, 2012
Leaf area index (LAI) is a key parameter in most land surface models. Models that operate at multiple spatial scales may require consistent LAI inputs at different spatial resolutions or from different sensors. For example, the atmosphere-land exchange inverse model and associated disaggregation algorithm (DisALEXI) use the moderate resolution imaging ...
Feng Gao, Martha C. Anderson, Yujie Wang, William P. Kustas   +3 more
openaire   +2 more sources

A photothermal model of leaf area index for greenhouse crops

Agricultural and Forest Meteorology, 2010
Abstract Leaf area index (LAI) is an important variable for modelling canopy photosynthesis and crop water use. In many crop simulation models, prediction of LAI is very sensitive to errors in the value of parameter “specific leaf area” (SLA), which often relies on destructive measurements to determine.
Xu, R., Dai, J., Luo, W., Yin, X., Li, Y., Tai, X., Han, L., Chen, Y., Lin, L., Li, G., Zou, C., Du, W., Diao, M.   +12 more
openaire   +2 more sources

Optimum Leaf Area Index in the Potato Crop

Nature, 1963
IN his review of the effect of competition for light on crop growth Donald1 notes the existence of but two published accounts presenting evidence to support the generally adopted conception of an ‘optimum leaf area index’ as the ratio of leaf area to ground covered at which the balance of photosynthesis over respiration is at a maximum value.
openaire   +2 more sources

Vegetative Development: Total Leaf Area and Surface Area Indexes

2010
Canopy management determines canopy shape and spatial leaf area distribution which in turn determines vineyard productivity. There are two indexes evaluating vineyard productivity which involve leaf development: total leaf area – LAI – and external leaf area – SA –. The first one refers to total leaf area developed per m2 of soil while SA refers to the
Pedro Junquera, José Ramón Lissarrague, Pilar Baeza, Patricia Sánchez-de-Miguel   +3 more
openaire   +2 more sources