Effects of light availability on crown structure, biomass production, light absorption and light-use efficiency of Hopea odorata planted within gaps in Acacia hybrid plantations

2016 ◽  
Vol 9 (5-6) ◽  
pp. 535-548 ◽  
Author(s):  
Tran Lam Dong ◽  
David I. Forrester ◽  
Chris Beadle ◽  
Richard Doyle ◽  
Nguyen Huy Hoang ◽  
...  
Keyword(s):  
Biomass Production ◽  
Light Absorption ◽  
Light Availability ◽  
Light Use Efficiency ◽  
Crown Structure ◽  
Use Efficiency ◽  
Acacia Hybrid ◽  
Hopea Odorata

Light absorption and light-use efficiency of juvenile white spruce trees in natural stands and plantations

2016 ◽  
Vol 376 ◽  
pp. 158-165 ◽  
Author(s):  
Andrew S. Nelson ◽  
Robert G. Wagner ◽  
Michael E. Day ◽  
Ivan J. Fernandez ◽  
Aaron R. Weiskittel ◽  
...  
Keyword(s):  
Light Absorption ◽  
White Spruce ◽  
Light Use Efficiency ◽  
Use Efficiency ◽  
Natural Stands

Growth response to thinning and its relation to site resources in Eucalyptusregnans

1995 ◽  
Vol 25 (1) ◽  
pp. 69-80 ◽  
Author(s):  
P.W. West ◽  
G.H.R. Osier
Keyword(s):  
Biomass Production ◽  
Tree Growth ◽  
Aboveground Biomass ◽  
Growth Response ◽  
Radiation Absorption ◽  
Light Use Efficiency ◽  
Individual Tree ◽  
Individual Tree Growth ◽  
Use Efficiency ◽  
Individual Trees

The factors determining individual tree growth response are examined during the 4 years following thinning in experiments in even-aged, 8- or 12-year-old regrowth Eucalyptusregnans F. Muell. forest at two sites in southern Australia. At one site, a vigorous understorey dominated by a sedge developed after the thinning. At that site, light-use efficiency by the trees was unaffected by thinning and the aboveground biomass production by the trees in the thinned stand was substantially less than that in the unthinned stand. At the other site, little understorey developed, light-use efficiency by trees in the thinned stand was greater than that in the unthinned stand, and aboveground biomass production was unaffected by thinning even though the leaf weight of the thinned stand was far below that of the unthinned stand. Where the understorey developed, it was concluded that it competed successfully with the trees for water, thereby reducing production in the thinned stand when compared with the unthinned stand. The individual tree growth response that occurred in the thinned stand at that site appeared to be due soley to the extra light available to individual trees following the canopy opening. Where the understorey did not develop, it was concluded that individual tree growth response was due not only to the extra light available to individual trees but also to the increased availability of belowground resources, most probably soil water. Application of a pre-existing stand growth model suggested that at that site the tendency for increased growth resulting from extra water availability in the thinned stand was just balanced by decreased growth due to lower radiation absorption by the reduced canopy, so that net production was unaffected by thinning.

scholarly journals Light absorption, light use efficiency and productivity of 16 contrasted genotypes of several Eucalyptus species along a 6-year rotation in Brazil

2019 ◽  
Vol 449 ◽  
pp. 117443 ◽  
Author(s):  
Guerric le Maire ◽  
Joannès Guillemot ◽  
Otavio C. Campoe ◽  
José-Luiz Stape ◽  
Jean-Paul Laclau ◽  
...  
Keyword(s):  
Light Absorption ◽  
Eucalyptus Species ◽  
Light Use Efficiency ◽  
Use Efficiency ◽  
Efficiency And Productivity

scholarly journals Adding Far-Red to Red-Blue Light-Emitting Diode Light Promotes Yield of Lettuce at Different Planting Densities

2021 ◽  
Vol 11 ◽  
Author(s):  
Wenqing Jin ◽  
Jorge Leigh Urbina ◽  
Ep Heuvelink ◽  
Leo F. M. Marcelis
Keyword(s):  
Leaf Area ◽  
Biomass Production ◽  
Plant Biomass ◽  
Stem Elongation ◽  
Incident Light ◽  
Dry Weight ◽  
Light Interception ◽  
Planting Density ◽  
Light Use Efficiency ◽  
Use Efficiency

The economic viability and energy use of vertical farms strongly depend on the efficiency of the use of light. Increasing far-red radiation (FR, 700–800 nm) relative to photosynthetically active radiation (PAR, 400–700 nm) may induce shade avoidance responses including stem elongation and leaf expansion, which would benefit light interception, and FR might even be photosynthetically active when used in combination with PAR. The aims of this study are to investigate the interaction between FR and planting density and to quantify the underlying components of the FR effects on growth. Lettuce (Lactuca sativa cv. Expertise RZ) was grown in a climate chamber under two FR treatments (0 or 52 μmol m–2 s–1) and three planting densities (23, 37, and 51 plants m–2). PAR of 89% red and 11% blue was kept at 218 μmol m–2 s–1. Adding FR increased plant dry weight after 4 weeks by 46–77% (largest effect at lowest planting density) and leaf area by 58–75% (largest effect at middle planting density). Radiation use efficiency (RUE: plant dry weight per unit of incident radiation, 400–800 nm) increased by 17–42% and incident light use efficiency (LUEinc: plant dry weight per unit of incident PAR, 400–700 nm) increased by 46–77% by adding FR; the largest FR effects were observed at the lowest planting density. Intercepted light use efficiency (LUEint: plant dry weight per unit of intercepted PAR) increased by adding FR (8–23%). Neither specific leaf area nor net leaf photosynthetic rate was influenced by FR. We conclude that supplemental FR increased plant biomass production mainly by faster leaf area expansion, which increased light interception. The effects of FR on plant dry weight are stronger at low than at high planting density. Additionally, an increased LUEint may contribute to the increased biomass production.

Stem production, light absorption and light use efficiency between dominant and non-dominant trees of Eucalyptus grandis across a productivity gradient in Brazil

2013 ◽  
Vol 288 ◽  
pp. 14-20 ◽  
Author(s):  
Otávio Camargo Campoe ◽  
José Luiz Stape ◽  
Yann Nouvellon ◽  
Jean-Paul Laclau ◽  
William L. Bauerle ◽  
...  
Keyword(s):  
Light Absorption ◽  
Eucalyptus Grandis ◽  
Light Use Efficiency ◽  
Productivity Gradient ◽  
Use Efficiency ◽  
Stem Production
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