The use of lidar and radar instruments to measure forest structure attributes such as height and biomass are being considered for future Earth Observation satellite missions. Large footprint lidar makes a direct measurement of the heights of scatterers in the illuminated footprint and can yield information about the vertical profile of the canopy. Synthetic Aperture Radar (SAR) is known to sens...

Forest pathogens and insects can accelerate tree mortality, increase stand structural heterogeneity, and alter tree community composition. In northern California, the canopy trees Abies concolor var. lowiana (Gord. & Glend.) Lemmon (white fir) and Pseudotsuga menziesii var. menziesii (Mirbel) Franco (Douglas-fir) co-occur but vary in shade tolerance and regenerative abilities following disturba...

Non-structural carbohydrates (NSC) are products of photosynthesis, and leaf NSC concentration may be a prognostic indicator of climate-change tolerance in woody plants. However, measurement of leaf NSC is prohibitively labor intensive, especially in tropical forests, where foliage is difficult to access and where NSC concentrations vary enormously by species and across environments. Imaging spe...

the aim of this study was to assess the regional effects of fire on the surface cover and forage production of mountainous rangelands of delfan county, lorestan province, iran. the fire took placed in june 2007 with significant effects on the vegetation characteristics in the study area. four fire affected sites were selected for sampling and a close area without fire was considered as control....

Title of Thesis: COMPARISON OF STRUCTURAL INTERACTION PATTERNS IN AFRICAN AMERICAN AND CAUCASIAN CLINICAL COUPLES: THE MODERATING EFFECT OF FINANCIAL RESOURCES John Rennie Hart, M.S., 2012 Thesis Directed By: Professor Norman B. Epstein, Department of Family Science This study focused on degrees to which African American and Caucasian couples who have sought couple therapy at a community clinic...

This paper aims to: 1) identify gender differences in perception and evaluation of retail agglomerations and 2) discuss the implications of these differences for marketing and management. Based on a conceptual model we surveyed 2,151 agglomeration shoppers using interviewer-administered questionnaires. Structural equation modelling revealed that: accessibility, parking and infrastructure are pe...

To understand the basic characteristics of the observed S-shaped wind profile and the exponential flux profile within forest canopies, three hypotheses are postulated. The relationship between these fundamental profiles is well established by combining the postulated hypotheses with momentum equations. Robust agreements between theoretical predictions and observations indicate that the nature o...

1. Different views exist as to what traits will lead to dominance when plants compete for light. One view is that taller plants with better relative positions in the canopy will exclude shorter plants because they intercept almost all light and thus can achieve a higher carbon gain. Alternatively, resource competition models predict that plants that are capable of positive net photosynthesis at...

Leaf area index (LAI) is a key variable for the understanding of several eco-physiological processes within a vegetation canopy. The LAI could thus provide vital information for the management of the environment and agricultural practices when estimated continuously over time and space thanks to remote sensing sensors. This study proposed a method to estimate LAI spatial and temporal variation ...

The physical based Li-Strahler geometric-optical model can be inverted to retrieve forest canopy structural variables. One of the main input variables of the inverted model is the fractional component of sunlit background (Kg). Kg is calculated by using pure reflectance spectra (endmembers) of the viewed surface components. To detect the forest canopy changes by the inverted geometricoptical mo...