background and objectives: in sciences like ecology, that measured value of a quantity to be processed within a definite border, the estimation of variable values in a particular time and place, using existing data from the use of information variable or variables another is common. in geoeographic studies, data collection is often the point. usually, it is essential that this data be generaliz...

• Here we explore the possible role of leaf-level gas exchange traits in determining growth rate differences and competitive interactions between evergreen angiosperms and conifers. • We compared relationships among photosynthetic capacity ( A max ), maximum stomatal conductance ( G s ), leaf life span, nitrogen concentration (N) and specific leaf area (SLA), in sun leaves of 23 evergreen angio...

We examined relationships between stem diameter, sapwood area, leaf area and transpiration in a 15-year-old mountain ash (Eucalyptus regnans F. Muell.) forest containing silver wattle (Acacia dealbata Link.) as a suppressed overstory species and mountain hickory (Acacia frigescens J.H. Willis) as an understory species. Stem diameter explained 93% of the variation in leaf area, 96% of the variat...

Construction cost (CC) is a quantifiable measure of energy demand for biomass production and is related to energy-use efficiency. Low construction cost was hypothesized to give invaders a growth advantage by utilizing energy efficiently. The present study examines the energetic cost of leaf construction in the invasive weed Mikania micrantha H.B.K. and its five common co-occurring species (Ager...

abstract many uses of landscape and important roll of ground covers aspect turfgrasses caused extensive of this plant in the cities. this study focuses on shoot responses and tolerance of native and commercial turf grasses under drought stress in a factorial experiment based on unbalanced completely random design on the year 2006. the specious that we used in this experiment included (i) commer...

topping stage of tobacco is a key time for development of agriculture measures to promote the quality of leaves. in order to investigating influence of topping timing and suckericide content on tobacco leaf, a factorial experiment on the basis of rcb design with 3 replications was conducted in 2011 at the tobacco research farm of isfahan. treatments were including topping time (t1: topping at e...

Leaf area measurements are commonly obtained by destructive and laborious practice. This paper 5 shows how stereo and Time-of-Flight (ToF) images can be combined for non-destructive automatic leaf area 6 measurements. We focus on some challenging plant images captured in a greenhouse environment, and show that 7 even the state-of-the-art stereo methods produce unsatisfactory results. By transfo...