B6 - Temperature, Wind, Water

beneficial effects of temperature on trees

gives information about the environment, growth is highest at optimal temperature

harmful effects of temperature on trees

high/freezing temperatures kill buds, stems, and protein. fire, frozen soil, and pests.

red belt

[soil is frozen, air is warm, lots of sunlight] transpiration but no water transport from roots. canopies die back

how do forest managers take temperature into account

plant in best microsites, and at best orientation

shelterwood

use of local seed source

beneficial effects of wind on trees

pollination

dispersal, transports materials

harmful effects of wind on trees

stem/root breakage

if the roots are frozen, plants lose water and die out

wind dispersal

more common than wind pollination. spreads seeds, spores, and live twigs.

how do forest managers take wind into account

clearcuts: reduce size, take wind flow directions into account

regeneration: seeding quality

density management: avoid gap/edges in sites

beneficial effect of drought level on trees

gives information about the environment

gets rid of some pests

harmful effects of drought level on trees

curtails photosynthesis, metabolism, and nutrient delivery

increases need for competition with neighbors

drought resister

avoids water stress but active. reduces h2o demand by the lower leaf area. deeper roots have access to h2o.

drought tolerator

functions with water stress. transports h2o in high stress situations with xylem.keeps cells turgid

drought escaper

not active in drought. animals that enter seed/spore stage when its dry. avoid sudden exposure

how do forest managers use drought

select species that are more drought tolerant

keep stalking low, fewer trees take up water

avoid sudden exposure