Leaf area index (LAI) is a key structural characteristic of forest ecosystems because of the role of green leaves in controlling many biological and physical processes in plant canopies. Accurate LA1 estimates are required in studies of ecophysiology, atmosphere-ecosystem interactions, and global change. The objective of this paper is to evaluate LA1 values obtained by several research teams us...

BACKGROUND AND AIMS Corner's rule states that thicker twigs bear larger leaves. The exact nature of this relationship and why it should occur has been the subject of numerous studies. It is obvious that thicker twigs should support greater total leaf area ([Formula: see text]) for hydraulical and mechanical reasons. But it is not obvious why mean leaf size ([Formula: see text]) should scale pos...

The aim of this study was to develop mathematical models estimate the leaf area common bean (Phaseolus vulgaris) in irrigated and non-irrigated water regimes from linear dimensions. An experiment carried out a completely randomized design with 3×2 factorial arrangement (three cultivars: Triunfo, Garapiá FC 104; two regimes: non-irrigated) 25 replicates each. A total 523 trifoliates were collect...

Accurate modelling of individual trees is essential for forestry applications e.g. forestry inventory and biomass estimation. This paper aims to utilise Terrestrial Laser Scanners (TLS) in order to derive a three dimensional (3D) tree structure and compute its volume. A new approach is proposed and tested to estimate the tree structure and leaf area using precise voxel-based tree models. In thi...

Leaf area index (LAI) and leaf chlorophyll content (Cab) are two important indicators of vegetation growth. Due to the high-coupling spectral signals content, simultaneous retrieval LAI Cab from remotely sensed date is always challenging. In this paper, an approach for joint estimation grassland unmanned aerial vehicle (UAV) hyperspectral data was proposed. Firstly, based on a PROSAIL model, 15...

As an essential vegetation biophysical trait that determines the plant's structure and photosynthetic capacity, characterizing of leaf area index (LAI) is important for growth health monitoring. The empirical models based on indices (VIs) from remote sensing images effective method deriving LAI. However, due to coupled impacts LAI chlorophyll content (LCC) canopy reflectance saturation effect, ...