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.