Info

Bciulu pendu lit

Deciduous

V. low

High

High

High

Sprout

None

B. pubscens

Deciduous

Low

High

High

High

Sprout

None

l.tirix gmeliitil

Deciduous

V. low

High

Moderate

1 ow"

Sprout

Low"

L. siWo'cu

Deciduous

V. tow

Moderate

High

Moderate*

Sprout

Low*

L. sukacze» ii

Deciduous

V. low

Moderate

Moderate

Low*

Sprout

Low"

Picea tibies

Evergreen

High

Moderate

Low

Low

None

Moderate

P. obnmita

Es-ergreen

High

Moderate

Low-

Low

None

Moderate

Pinus sylvestris

Evergreen

Low

High

Low

Moderate

Branch

High

Populas trémula

Deciduous

Low

Moderate

High

V. high

Sprout

Low

Source-. Modified from Pastor and Mtadenoff (1942). Additional data front Nikolov and Helroi-saari (1992) and Zasada et a!. (1992).

Shade tolerance, ability to tolerate low light: N-stress tolerance, ability to tolerate soils of low nitrogen availability; litter quality, chemical characteristics controlling ease of dccay, such as resins or lignin; high-quality materials decay easily (i.e. low lignin) while low-quality materials decay slowly (i.e. high lignin). estimate; -, not known.

period, and even conspecilic populations of these two biogeographic groups differ genetically and chemically, particularly for Betula. The eastward migration of northeastern Asian Beringian populations may be continuing, while the eastern North American populations continue to spread northwestward. Asian populations may have arrived in North America during the Pleistocene or earlier during the Pliocene, and survived in CordiUeraa

Table 3.1 Continued

Reproductive (raits

Table 3.1 Continued

Reproductive (raits

Reproductive

Dispersal

Seed shadow

Seed hank

Seed bank

Germination and

mechanism

mechanism

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