APPENDIX G SUCCESSIONAL PATHWAYS shrubs and III Code ScientificName Common Name ACMA Acer macrophyllum Bigleaf maple ALRU Alnus rubra Red alder ARME Arbutus menziesii Madrone CACH Castanopsis chr\jsophylla Chinquapin PISI 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 shallon 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 Successional Vegetation Models By Disturbance Regimes 5 & 6 .. __ .... _ Vegetation Grouping: Siuslaw Plant Assoc. _1,-,,1"· WET TSHE/RUSP _1 ...........·lrlrO':.JI,."r.� ... Charactoristic mortality) TSHE/RUSP-GASH (300 yrs) TSHE/RUSP-ACCI (100,000 acres +) TSHE/OPHO on or near a _�._.�_. ____ __ .. _ .�_ ___••••• �_.___ ._�___ ,_ � of disturbances or varying s ve ity· will siarlificantllvI . ...j' rrc>,rn.<>".-" e r understory veg and regenl these static rli",tlirh::lcnc,�� in the system. A 71 to 150 151 ALRU I TSHE-THPL* TSHE - THPL I ALRU PSME' ALRU PSME TSHE - ALRU General gaps Scattered ALRU, clumps 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. Successional Vegetation Models By Disturbance Regimes DISTURBANCE REGIME 8 Vegetation Grouping: Siuslaw Plant M��V,"". Disturbance Block Charactoristics DRY TSHE/RHMA et al Severity (30 - 70% mort) Assuming NO Disturbance TSHENAOV2 OW-MOO Frequency (100-300 yrs) TSHE/GASH TSHE/BENE Age Since Maior Disturbance 11 to 70 '71 to 150 151 • Dominent Tree Species �--�-��-�---�''i:���/TSHE General ---� Moderate to High Moderate -�-. .. layering Regen --.----------- '--.. TSHE THPL' AHME, CACH ----- 1 . .. ITSHE I THPt increasing Ground increasing moderate Stable I Successional Vegetation Models By Disturbance Regimes r-------.----------------�------------------------------�------------------�--------------------_i DISTURBANCE REGIME 5 & 6 Vegetation (;rouping" Siuslaw Plant Assoc. Disturbance Block Charactoristic MOIST TSHE/POMU * High Severity (>10% mortality) TSHE/OXOR * Low Frequency (300 yrs) TSHE/ACCIIPOMU * Giant Size (100,000 acres +) TSHE/ACCI/GASH �----.------------------�-------------------------------�------------------�-------- succession were developed for each environment by using inventory information and field observations. Age Since Major Disturbance o to 10 11 to 70 I 71 to 150 151 - 300 Dominent Tree PSME PSME PSMEI TSHE PSME/AlRU PSME PSMEI TSHE (Stem Exclusion Phase) � __�=�� moderate __ =-__________________ __________________ ______ ____ ____ �__ ___ ____. _______ L- _______-+ __________ -+ � -----------------� Increased frequency Scattered AlRU, TSHE, THPL, ACMA ------------------+--------------------�------- Ground "'1-'<:;;''''<;;;;:) decreases Greater diversity of species High diversity of Moderate Cover \I�r·I�"'IQ 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. Successional Vegetation Models By Disturbance Regimes DISTURBANCE REGIME 5 & 6 Vegetation Grouping: Siuslaw Plant .n-.,<;;IIV'-" _ _ I.r ............ n�::lInr'g Block Characteristics DRY al 11 u:_'"- Severity (>70% mortality) Frequency (300 yrs) TSHE/GASH (100,000 acres) ITSHE/BENE et al Age Since Major Disturbance 11 to 70 71 to 150 151 - 300 UUlmllnF'nr Tree PSME PSME/TSHE Moderate to Moderate I * I L inNQ�einn ��-"�"��" ..... Scattered TSHE THPL TSHE THP Cover moderate Stable Successional Vegetation Models By Disturbance Regimes DISTURBANCE REGIME 8 Vegetation Grouping: Siuslaw Plant Assoc. Disturbance Block Characteristics WET TSHE/RUSP Mod-High Severity (30 - 70% mort) Low-Mod Frequency (100-300 yrs) Variable size Age Since Major Disturbance 11 to 70 71 to 150 151 • Tree ALRU I TSHE-THPL* TSHE-THPL AlRU PSME I ALRU PSME-TSHE- gaps Scattered ALRU, clumps Mod. stocking PSME, ALRU, ACMA _ayering Regen Tshe, ACM Scattered �.. -�- � . moderate layering f,\ � - ....----- .. ... scattered density greater diversity of -�-- .... ... moderatly stable 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 150 300 ----- ----""---- -- --.,. Moderate Low Moderate Two age PSME. Multiage layering of shade species after dist. tolerant species Ground Cover 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 I, Age Since Major Disturbance to 70 71 to 150 151 - Dominent Tree PSME PSME Species PSME I ACMA I TSHE PSME I TSHE General Density ---�-� 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. I Successional Vegetation Models By Disturbance Regimes DISTURBANCE REGIME 8 Vegetation Grouping: ISiuslaw Assoc. 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 150 - 300 PSME Species General Moderate to High Layering Regen CACH age PSME. Less survival moist areas Two age PSME; Multi layering of ;'-;n'fnln!mn from ARME & eACH shade tolerant species are so come back fast Higher and no disturbance regimes are: .