Biochemical analysis of seeds and seedlings of H. sucuuba, a tree that colonizes both várzea floodplains and terra firme forests, showed significant differences in the proportion and types of accumulated carbohydrates in seeds of the two populations.
Finally, Planting Fields Arboretum in Oyster Bay will complete its Arbor Day Festival from 10 a.m. to 5 p.m. with tours of Coe Hall, live animal programs, tree planting and seedling giveaway, and a "Trees of Life" concert by Steve Schuch.
She and colleagues looked at about 30,000 seedlings of 180 tree species in a 50-hectare, long-term plot on Barro Colorado Island in Panama.
For example, most tree species require openings in the forest canopy (canopy gaps) in order to receive sufficient light to attain a mature size and stature, but the seedlings of different tree species show very different requirements for light.
In 2007, we estimated the survival of 2210 recently germinated seedlings of nine tree species transplanted near conspecific and heterospecific trees, a surrogate for describing distance-dependent mortality, as part of an experiment with landscape-level replication across eight mixed-deciduous forests in the southern Appalachian Mountains of North Carolina.
Janzen experimented with planting seedlings of native tree species, but he quickly concluded that natural reforestation, with seeds carried by wind and animal droppings, worked better.
Landscape conditions (distance from the nearest hardwood forest and altitude) affected the abundance of small saplings and seedlings of tall tree species, but not the other classes.
Seedlings of twelve tree species were grown in pots, which were irrigated with landfill leachate at the EC50 levels, with tap water as control.
The model successfully showed the indirect positive effects of deer and mice, which improved the survival rate of five cohorts of the seedlings of three tree species by ameliorating the direct negative effect of dwarf bamboo.
Thus, in the shaded forest understory, where the seedlings of some tree species are close to their physiological tolerance limit, herbivory could play an important role in plant establishment.
