scholarly journals Mast fruiting of large ectomycorrhizal African rain forest trees: importance of dry season intensity, and the resource-limitation hypothesis

2006 ◽  
Vol 170 (3) ◽  
pp. 561-579 ◽  
Author(s):  
David M. Newbery ◽  
George B. Chuyong ◽  
Lukas Zimmermann
Keyword(s):  
Rain Forest ◽  
Resource Limitation ◽  
Dry Season ◽  
Forest Trees ◽  
Mast Fruiting

Seasonal variation in the leaf gas exchange of tropical forest trees in the rain forest–savanna transition of the southern Amazon Basin

2005 ◽  
Vol 21 (4) ◽  
pp. 451-460 ◽  
Author(s):  
Eduardo Jacusiel Miranda ◽  
George L. Vourlitis ◽  
Nicolau Priante Filho ◽  
Pedro Correto Priante ◽  
José Holanda Campelo ◽  
...  
Keyword(s):  
Rain Forest ◽  
Amazon Basin ◽  
Deciduous Forest ◽  
Leaf Gas Exchange ◽  
Light Response ◽  
Dry Season ◽  
Forest Trees ◽  
Wet Season ◽  
Mato Grosso ◽  
Physiological Capacity

The photosynthetic light response of Amazonian semi-deciduous forest trees of the rain forest–savanna transition near Sinop Mato Grosso, Brazil was measured between July 2000 and September 2003 to test the hypothesis that the photosynthetic capacity of trees acclimated to different growth light environments will decline during the dry season. Maximum photosynthesis (Amax) and stomatal conductance (gmax) were significantly higher during the wet season; however, the physiological response to drought was not a clear function of growth light environment. For some species, such as Psychotria sp. growing in the mid-canopy, internal leaf CO2 concentration (Ci) was >30% lower during the dry season suggesting that declines in Amax were caused in part by stomatal limitations to CO2 diffusion. For other species, such as Brosimum lactescens growing at the top of the canopy, Tovomita schomburgkii growing in the mid-canopy, and Dinizia excelsa growing in the understorey, dry season Ci declined by <20% suggesting that factors independent of CO2 diffusion were more important in limiting Amax. Dry-season declines in gmax appeared to be important for maintaining a more consistent leaf water potential for some species (T. schomburgkii and D. excelsa) but not others (Psychotria sp.). These results indicate that while seasonal drought exerts an important limitation on the physiological capacity of semi-deciduous Amazonian forest trees, the mechanism of this limitation may differ between species.

Seedling recruitment failure following dipterocarp mast fruiting

2004 ◽  
Vol 20 (2) ◽  
pp. 229-231 ◽  
Author(s):  
Arthur G. Blundell ◽  
David R. Peart
Keyword(s):  
Rain Forest ◽  
Seedling Recruitment ◽  
South East Asia ◽  
Forest Trees ◽  
Seedling Density ◽  
General Acceptance ◽  
Recruitment Failure ◽  
Mast Fruiting ◽  
Seed Crops ◽  
Satiation Hypothesis

Many rain-forest trees in South-East Asia, including the dominant canopy family Dipterocarpaceae, reproduce in gregarious mast-fruiting events once every 2–11 y (Ashton et al. 1988). The dominant hypothesis for the evolution of masting is that predators are incapable of consuming mast seed crops, so that natural selection has favoured parent trees that fruit in synchrony (Janzen 1974, 1976). Mast flowering and fruiting are visually spectacular and quantified in harvest records for dipterocarp species producing large, oil-rich tengkawang seeds (Curran et al. 1999). Seedling recruitment following a mast is less obvious and has no immediate commercial value. However, a number of pulses of recruitment have been documented (Ashton et al. 1988, Chan 1980, Fox 1972, Liew & Wong 1973). These, together with general acceptance of the satiation hypothesis, have led to the widespread assumption that masts reliably increase seedling density and generate distinct seedling cohorts (Whitmore 1998). Indeed, foresters in Malaysia and Indonesia often recommend harvesting only after a mast, to ensure high densities of seedling regeneration.

scholarly journals Soil profile, relief features and their relation to structure and distribution of Brazilian Atlantic rain forest trees

2012 ◽  
Vol 69 (1) ◽  
pp. 61-69 ◽  
Author(s):  
Frederico Augusto Guimarães Guilherme ◽  
Tiago Osório Ferreira ◽  
Marco Antonio Assis ◽  
Pablo Vidal Torrado ◽  
Leonor Patrícia Cerdeira Morellato
Keyword(s):  
Soil Profile ◽  
Rain Forest ◽  
Atlantic Rain Forest ◽  
Forest Trees

Multiple facets of rarity among rain forest trees in the Western Ghats of India

2018 ◽  
Vol 228 ◽  
pp. 110-119
Author(s):  
Priya Davidar ◽  
François Munoz ◽  
Jean-Philippe Puyravaud ◽  
D. Mohandass ◽  
V.S. Ramachandran
Keyword(s):  
Rain Forest ◽  
Western Ghats ◽  
Forest Trees ◽  
Western Ghats Of India ◽  
The Western Ghats

Australian Rain-Forest Trees

Soil Science ◽  
1931 ◽  
Vol 32 (4) ◽  
pp. 326
Author(s):  
W. D. FRANCIS
Keyword(s):  
Rain Forest ◽  
Forest Trees

Nutrient-uptake and -use efficiency in seedlings of rain-forest trees in New Caledonia: monodominants vs. subordinates and episodic vs. continuous regenerators

2018 ◽  
Vol 34 (5) ◽  
pp. 277-292
Author(s):  
Jennifer Read ◽  
Stéphane McCoy ◽  
Tanguy Jaffré ◽  
Murray Logan
Keyword(s):  
Rain Forest ◽  
New Caledonia ◽  
Nutrient Use Efficiency ◽  
Single Species ◽  
Forest Trees ◽  
Uptake Efficiency ◽  
Nutrient Use ◽  
Use Efficiency ◽  
Efficient Uptake ◽  
Efficiency And Productivity

Abstract:The upper canopy of some rain forests in New Caledonia is dominated by single species. These monodominants are commonly secondary species, their dominance not persisting without disturbance. We tested whether dominance is associated with efficient uptake and use of nutrients (N, P and K), comparing between seedlings of monodominants (Nothofagus spp., Arillastrum gummiferum and Cerberiopsis candelabra) and 14 subordinates, grown in a nursery house. We also tested whether this trend applies more broadly to shade-intolerant trees that regenerate episodically (ER species) versus shade-tolerant trees that regenerate continuously (CR species). In the sun treatment, monodominants had higher photosynthetic nutrient-use efficiency and productivity for N and K, and uptake efficiency for N, P and K, than subordinates; ER species had higher photosynthetic nutrient-use efficiency for N, P and K, and uptake efficiency for N and P, than CR species. Uptake efficiency and productivity per nutrient mass were uncorrelated across species, yet Nothofagus spp., A. gummiferum and C. candelabra combined high levels of both traits for N, and Nothofagus spp. and A. gummiferum combined moderate to high levels for P, in sun-grown seedlings. This trait combination may contribute substantially to competitiveness and post-disturbance dominance on these nutrient-poor soils.

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