Competition with different life forms Herbs Forbs Grasses Woody shrubs Competition with many species brushy stage Wide range of ages A small advantage in years can be a large advantage in competitive ability ID: 545712
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Slide1
Stand InitiationSlide2Slide3Slide4Slide5
Competition with different life forms
Herbs
ForbsGrasses
Woody shrubsSlide6Slide7
Competition with many species
“
brushy stage”Slide8Slide9
Wide range of ages
A small advantage in years can be a large advantage in competitive abilitySlide10
eastern white pine (
Pinus
strobus
)
Steven
Katovich
, USDA Forest Service, Bugwood.orgSlide11
Wide variation in site
Small plant size magnifies the growth effects caused by subtle variations in microenvironment
Microsite is the entire environment of the individual
Trees are in more vulnerable position
e
.g. leader frost damageSlide12Slide13Slide14
Stand environment changing rapidly
Site is still responding to previous disturbance
‘assart
’ effect
Nitrogen fixing
herbacious
vegetationSlide15Slide16
Unfilled (available) growing space
Free to grow stageSlide17Slide18
Harper sieve
‘Can’t be old if you die young’
Nature selects for competitive ability during stand initiation stageTree breeding programs do not – require management