Abies grandis (ABGR) Series 



Two habitat types within this series were located on the 

 study area. This series is bounded on drier sites by the 

 PSME series, on more moist sites by the THPL and TSHE series, 

 and on cooler sites by the ABLA series. ABGR/CLUN occurs 

 primarily on easterly aspects between 1,160 m (3,800 feet) 

 and 1,400 m (4,600 feet). The ABGR/XETE habitat type only 

 occurs on well-drained, cool sites, generally on or near 

 ridgetops. 



Tsuga heterophylta (TSHE) Series and Thuja pliaata (THPL) Series 



Although they are separate series the THPL and TSHE habi- 

 tat types occur in such interwoven fashion that they are usu- 

 ally discussed simultaneously. The TSHE/CLUN habitat type is 

 the most common type found on the study area and is distri- 

 buted on all moist aspects below 915 m (3,000 feet). This 

 habitat type is primarily restricted to this portion of the 

 state since it occupies areas having a very moist ocean- 

 influenced climate. Where TSHE and THPL occur together, TSHE 

 is dominant except where the water table is high and then 

 TSHE and THPL act as co-climax species within the THPL/OPHO 

 habitat type. This type occurs in shaded creekbottoms on 

 all aspects except south. The THPL/CLUN habitat type occurs 

 on slightly warmer and drier sites than TSHE/CLUN. The ABGR 

 series borders the TSHE and THPL series on slightly drier 

 sites while the PSME series occurs on significantly drier 

 sites. The ABLA series borders the TSHE and THPL series on 

 colder sites. 



Abies lasiooarpa (ABLA) Series 



This series is divided into lower subalpine, upper sub- 

 alpine and timberline habitat types. All but two of the 

 habitat types in this series (as given in Table 1) occur 

 within the lower subalpine category. The ABLA/CLUN habitat 

 type is rather restricted. Due to the westerly location of 

 the study area, this habitat type receives competition from 

 other habitat types more able to compete under the maritime 

 climatic conditions (THPL, TSHE and ABGR) . ABLA/CLUN is the 

 warmest and driest ABLA habitat type on the study area. The 

 ABLA/CACA habitat type occurs on very restricted, poorly- 

 drained sites, usually along creeks, in seeps, or in basins 

 at the head of drainages. ABLA/MEFE is probably the most 

 common habitat type in this series on the study area. It is 

 common above 1,525 m (5,000 feet) on all aspects except south. 

 It is bordered by ABLA/CLUN, ABGR/CLUN or TSHE/CLUN below and 

 by ABLA/LUHI above. Where Tsuga mer>te?isiana {TSl^iE) is success- 

 fully reproducing within this series it receives the primary 

 designation in the habitat type name. Where TSME is success- 

 fully reproducing (and the habitat type would otherwise be 



