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APPENDIX G
SUCCESSIONAL PATHWAYS
shrubs and III
Code Scientific Name Common Name
ACMA Acer macrophyllum Bigleaf maple
ALRU Alnus rubra Red alder
ARME Arbutus menziesii Madrone
CACH Castanopsis chr\jsophylla Chinquapin
PIS I Picea sitchensis Sitka spruce
PSME Pseudotsuga menziesii Douglas-fir THPL Thuja plicata Western redcedar TSHE Tsuga heterophylla Western hemlock
Shrubs
ACCI Acer circinatum Vine maple BENE Berberis nervosa Dwarf Oregon grape
COC02 Corylus cornuta California hazel
GASH Gaultheria shall on Salal HODI Holodiscus discolor Ocean-spray
Menziesia Fool's huckleberry OPHO Oplopanax horridum Devil's club RHMA Rhododendron Pacific rhododendron
Rubus Salmonberry VAOV2 Vaccinium ovatum Evergreen huckleberry
Herbs/Ferns
General
Successional Vegetation Models By Disturbance Regimes
.. __ .... _ 5 & 6
_1 ........... ·lrlrO':.JI,."r.� _1,-,,1"· ... Charactoristic
mortality)
(300 yrs)
(100,000 acres +)
Vegetation Grouping:
WET
on or near a
Siuslaw Plant Assoc.
TSHE/RUSP
TSHE/RUSP-GASH
TSHE/RUSP-ACCI
TSHE/OPHO
_�._.�_. ____ . __ ... _ .�_ . ___ ••••• �_. ___ ._� ___ ,_� ... j' rrc>,rn .<>".-" of disturbances or varying severity· will siarlificantllv I
A
gaps
understory veg and regenl these static rli",tlirh::lcnc,�� in the system.
71 to 150
ALRU I TSHE-THPL*
PSME' ALRU
Scattered ALRU, clumps
151
TSHE - THPL I ALRU PSME TSHE - ALRU
Scatterd PSME, moderate canopy closure-----.--.. -
.-.--.----,.-�----.,.-,--.. -,.-.-.- - ..... moderate - variable,
scattered density
pre1l0rrllnantly alder to disturbances. In areas a mix of alder and Douglas-fir, UULlu.",,,,-m will eventually
disturblllnce neauem;,'V and severity. a high frequency of sevar disturbances· exposed bare soil from slides andlof flooding
shade intoterance.)
00 some what of a random occurrence, dependant on seed source. Mixed Alder! Douglas-fir stands develop a two story effect.
Dominent Tree
Species
General
layering Regen
Ground
Successional Vegetation Models By Disturbance Regimes
DISTURBANCE REGIME 8 Disturbance Block Charactoristics
Severity (30 - 70% mort) OW-MOO Frequency (100-300 yrs)
Vegetation Grouping: DRY
Assuming NO Disturbance
Siuslaw Plant M��V,"".
TSHE/RHMA et al TSHENAOV2 TSHE/GASH TSHE/BENE
Age Since Maior Disturbance 11 to 70
---�
--.----------- '--.. TSHE THPL' AHME, CACH
-�-. .. Moderate to High
'71 to 150
�--�-��-�---�''i :���/TSHE
Moderate
151 •
----- 1 . .. ITSHE I THPt increasing
increasing moderate
Stable
Dominent Tree
I Successional Vegetation Models By Disturbance Regimes r-------.----------------�------------------------------�------------------�--------------------_i
DISTURBANCE REGIME 5 & 6 Disturbance Block Charactoristic * High Severity (>10% mortality) * Low Frequency (300 yrs) * Giant Size (100,000 acres +)
Vegetation (;rouping" Siuslaw Plant Assoc. MOIST TSHE/POMU
TSHE/OXOR TSHE/ACCIIPOMU TSHE/ACCI/GASH
�----.------------------�-------------------------------�------------------�--------succession were developed for each environment by using inventory information and field observations.
o to 10 Age Since Major Disturbance
PSME
PSME/AlRU
11 to 70
I
(Stem Exclusion Phase)
PSME
PSME
71 to 150
� __ �=�� moderate
151 - 300
PSMEI TSHE
PSMEI TSHE
� __________ � _____ ____ . _______ L-_______ -+ __________ =-__________________ -+ __________________ � ______ -----------------�
Ground
Increased frequency
Scattered AlRU, TSHE, THPL,
ACMA ------------------+--------------------�-------
"'1-'<:;;''''<;;;;:) decreases Greater diversity of species
Moderate
tolerant species are introduced and have had time to
Dense stands of OF go through stem exclusion phase· significant in
eXCllJSIOn phase then high again.
High diversity of
Cover \I�r·I�"'IQ
UUlmllnF'nr Tree
Cover
Successional Vegetation Models By Disturbance Regimes
DISTURBANCE REGIME 5 & 6 Vegetation Grouping: Siuslaw Plant .n-.,<;;IIV'-" _
_ ............ I.rn�::lInr'g Block Characteristics DRY al 11 u:_'"- Severity (>70% mortality)
Frequency (300 yrs) ITSHE/GASH
(100,000 acres) TSHE/BENE et al
Age Since Major Disturbance 11 to 70 71 to 150
Moderate to
��-"�"��" ..... Scattered TSHE I THPL *
151 - 300
PSME
PSME/TSHE
Moderate
TSHE I THPL inNQ�einn
moderate
Stable
Tree
_ayering Regen
Successional Vegetation Models By Disturbance Regimes
DISTURBANCE REGIME 8 Disturbance Block Characteristics Mod-High Severity (30 - 70% mort) Low-Mod Frequency (100-300 yrs) Variable size
Vegetation Grouping: WET
Age Since Major Disturbance 11 to 70
gaps
Tshe, ACMf,\ Scattered
71 to 150
ALRU I TSHE-THPL*
PSME I ALRU
Scattered ALR U, clumps
Mod. stocking PSME, ALRU, ACMA
� - .... ----- .. � . . -�- � . ...
-�-- .... ...
Siuslaw Plant Assoc. TSHE/RUSP
151 •
TSHE-THPL AlRU
PSME-TSHE-
moderate layering
scattered density
greater diversity of
moderatly stable cover
Ground Cover
I Successional Vegetation Models By Disturbance Regimes
REGIME 8 Vegetation Grouping: ISiuslaw Plant MOIST
Assuming Disturbance
Sinc� lVIi:ljor Disturbance 71 to 150 Post Disturbance
Moderate Low
species after dist.
150 300
----- ----""---- - - --.,.
Moderate
Two age PSME. Multiage layering of shade
tolerant species
Dominent Tree
Species
General Density
I Successional Vegetation Models By Disturbance Regimes
DISTURBANCE REGIME 8 Vegetation Grouping: ISiuslaw Disturbance Block Characteristics MOIST
Severity (30 - 70%, mort) Assuming NC) Disturbance Low-Mod Frequency (100-300 yrs) Variable size
Age Since Major Disturbance to 70 71 to 150
PSME
I ,
PSME
151 -
PSME I ACMA I TSHE PSME I TSHE
increasing
TSHE, scattered clomps of alder and ACMA Increased fre,aw�nc:v
Scattered TSHE, THPL �
species decrt:;!ases Greater diversity of speciE�s High
Moderate Cover Variable
vs TSHElTHPL dominance.
---�-�
Species
General
Layering Regen
I Successional Vegetation Models By Disturbance Regimes
CACH
DISTURBANCE REGIME 8 Vegetation Grouping: ISiuslaw Disturbance Block Characteristics DRY Mod-High Severity (30 - 70% mort) Assuming Disturbance
ow-Mod Frequency (100-300 yrs) Variable size
Age Since Major Disturbance 150 Post Disturbance
PSME
age PSME. Less survival moist areas ;'-;n'fnln!mn from ARME & eACH
are so come back fast
and no disturbance regimes are:
150 - 300
Moderate to High
Two age PSME; Multi layering of
shade tolerant species
Higher
Assoc.