Forest tree seedlings--collected for season 1929 ; Hardwood cuttings ; Forest tree seeds [price lists] /

AbstractThis study examined the mechanisms of facilitation and importance of seed dispersal during establishment of forest tree species in an Afrotropical woodland. Seedling survival of Syzygium guineense ssp. afromontanum was monitored for 2.5 years at four different microsites in savannah woodland in Malawi (southeastern Africa) under Ficus natalensis (a potential nurse plant), Brachystegia floribunda (a woodland tree), Uapaca kirkiana (a woodland tree), and at a treeless site. The number of naturally established forest tree seedlings in the woodland was also counted. Additionally, S. guineense ssp. afromontanum seed deposition was monitored at the four microsites. Insect damage (9% of the total cause of mortality) and trampling by ungulates (1%) had limited impact on seedling survival in this area. Fire (43%) was found to be the most important cause of seedling mortality and fire induced mortality was especially high under U. kirkiana (74%) and at treeless site (51%). The rate was comparatively low under F. natalensis (4%) and B. floribunda (23%), where fire is thought to be inhibited due to the lack of light-demanding C4 grasses. Consequently, seedling survival under F. natalensis and B. floribunda was higher compared with the other two microsites. The seedling survival rate was similar under F. natalensis (57%) and B. floribunda (59%). However, only a few S. guineense ssp. afromontanum seedlings naturally established under B. floribunda (25/285) whereas many seedlings established under F. natalensis (146/285). These findings indicate that the facilitative mechanism of fire suppression is not the only factor affecting establishment. The seed deposition investigation revealed that most of the seeds (85%) were deposited under F. natalensis. As such, these findings suggest that in addition to fire suppression, dispersal limitations also play a role in forest-savannah dynamics in this region, especially at the community level.

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The ecology of tropical forest tree seedlings (Man and the Biosphere Series)

Trends in Ecology & Evolution ◽

10.1016/s0169-5347(97)83202-8 ◽

1997 ◽

Vol 12 (9) ◽

pp. 370-371

Author(s):

D.McC. Newbery

Keyword(s):

Tropical Forest ◽

Forest Tree ◽

Tree Seedlings ◽

Tropical Forest Tree Seedlings

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Studies on the Nutrition of Forest Tree Seedlings I. Mineral Nutrition of Birch

Physiologia Plantarum ◽

10.1111/j.1399-3054.1957.tb06962.x ◽

1957 ◽

Vol 10 (2) ◽

pp. 418-439 ◽

Cited By ~ 21

Author(s):

Torsten Ingestad

Keyword(s):

Mineral Nutrition ◽

Forest Tree ◽

Tree Seedlings

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Establishment of forest tree seedlings

10.31274/rtd-180817-540 ◽

1959 ◽

Author(s):

Gordon Elwood Gatherum

Keyword(s):

Forest Tree ◽

Tree Seedlings

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Alterations in the lipid and soluble sugar content of melanoxylon brauna seeds during natural and accelerated ageing

Revista Brasileira de Sementes ◽

10.1590/s0101-31222010000300017 ◽

2010 ◽

Vol 32 (3) ◽

pp. 152-162 ◽

Cited By ~ 1

Author(s):

Viviana Borges Corte ◽

Eduardo Euclydes de Lima e Borges ◽

José Francisco de Carvalho Gonçalves ◽

Mirian Sousa Silva

Keyword(s):

Fatty Acids ◽

Tropical Forest ◽

Sugar Content ◽

Soluble Sugar ◽

Soluble Sugars ◽

Forest Tree ◽

Accelerated Ageing ◽

Natural Ageing ◽

Metabolic Reactions ◽

Tree Seeds

The decay of seeds is irreversible and at best can only be delayed by applying techniques that reduce the velocity of the metabolic reactions involved. There is little information on the biochemistry of tropical forest tree seeds related to their storability. It was investigated the influence of the composition of lipids and soluble sugars of two storage compartments, the cotyledons and the embryonic axis, of Melanoxylon brauna Schot. (Leguminosae- Caesalpinioideae), a hardwood known as black brauna, seeds stored at 20 ºC for 0, 3, 6, 9 and 12 months (natural ageing) and for 0, 24, 48, 72 and 96 hours at 40 ºC (accelerated ageing). The levels of fatty acids and monosaccharides varied differentially in each of the embryo storage compartments. Changes in oligosaccharide levels were similar for both types of ageing, diminishing in both compartments. Ageing can be attributed to the significant decrease of oligosaccharides and the increase of glucose in both types of ageing and both embryo compartments.

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