نتایج جستجو برای: light interception

تعداد نتایج: 401071  

2016
Jee Hoon Kim Joon Woo Lee Tae In Ahn Jong Hwa Shin Kyung Sub Park Jung Eek Son

Canopy photosynthesis has typically been estimated using mathematical models that have the following assumptions: the light interception inside the canopy exponentially declines with the canopy depth, and the photosynthetic capacity is affected by light interception as a result of acclimation. However, in actual situations, light interception in the canopy is quite heterogenous depending on env...

2016
Zhigang Bai Shuchun Mao Yingchun Han Lu Feng Guoping Wang Beifang Yang Xiaoyu Zhi Zhengyi Fan Yaping Lei Wenli Du Yabing Li

Identifying the characteristics of light interception and utilization is of great significance for improving the potential photosynthetic activity of plants. The present research investigates the differences in absorbing and converting photosynthetically active radiation (PAR) among various cotton cultivars. Field experiments were conducted in 2012, 2013 and 2014 in Anyang, Henan, China. Ten cu...

2014
Tsu-Wei Chen Thi My Nguyet Nguyen Katrin Kahlen Hartmut Stützel

There is increasing interest in evaluating the environmental effects on crop architectural traits and yield improvement. However, crop models describing the dynamic changes in canopy structure with environmental conditions and the complex interactions between canopy structure, light interception, and dry mass production are only gradually emerging. Using tomato (Solanum lycopersicum L.) as a mo...

Journal: :Tree physiology 1996
Pauline Stenberg

Coniferous tree canopies typically carry more leaf area than is necessary to intercept most of the incoming light. I postulated that an excessively large leaf area will reduce net productivity at tree level, unless the net photosynthetic production of the most shaded shoots in the canopy remains positive. The hypothesis tested was that a coniferous tree canopy maintains a large productive leaf ...

Journal: :Annals of botany 2011
Fernando Valladares Ernesto Gianoli Alfredo Saldaña

BACKGROUND AND AIMS While the climbing habit allows vines to reach well-lit canopy areas with a minimum investment in support biomass, many of them have to survive under the dim understorey light during certain stages of their life cycle. But, if the growth/survival trade-off widely reported for trees hold for climbing plants, they cannot maximize both light-interception efficiency and shade av...

1997
Jens N. Wünsche Alan N. Lakso Terence L. Robinson

Four methods of estimating daily light interception (fisheye photography with image analysis, multiple-light sensors, ceptometer, and point grid) were compared using various apple (Malus domestica Borkh.) tree forms: slender spindle, Yand T-trellises, and vertical palmette. Interactions of tree form, time of day, and atmospheric conditions with light interception estimates were examined. All me...

Journal: :بوم شناسی کشاورزی 0
اسماعیل رضائی چیانه عادل دباغ محمدی نسب محمدرضا شکیبا کاظم قاسمی گلعذانی سعید اهری زاد

intercropping is a correct method of management for crop production and leads to improvement of resource absorption and use by plants. in order to evaluate light interception and some characteristics of canopy in monocropping and intercropping of maize (zea mays l.) and faba bean (vicia faba l.) under climatic conditions of tabriz, a field experiment was conducted in 2006-2007 at the research s...

2010
Dan Binkley José Luiz Stape William L. Bauerle Michael G. Ryan

The growth of wood in trees and forests depends on the acquisition of resources (light, water, and nutrients), the efficiency of using resources for photosynthesis, and subsequent partitioning to woody tissues. Patterns of efficiency over time for individual trees, or between trees at one time, result from changes in rates photosynthesis and shifts in the relative partitioning to wood. We measu...

Journal: :American journal of botany 1998
S Oberbauer M Noudali

The amount of light intercepted by vertically oriented, shingle leaves of juvenile Monstera tenuis vines growing in forest understory was compared to the amount of light the leaves would intercept if they were horizontal. Light levels were monitored using quantum sensors and hemispherical photography. Shingle leaves absorb less light than they would if the leaves were horizontal at the same pos...

2018
Dae Ho Jung Joon Woo Lee Woo Hyun Kang In Ha Hwang Jung Eek Son

Photosynthesis is an important physiological response for determination of CO₂ fertilization in greenhouses and estimation of crop growth. In order to estimate the whole plant photosynthetic rate, it is necessary to investigate how light interception by crops changes with environmental and morphological factors. The objectives of this study were to analyze plant light interception using a three...

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