TREE

LAYER

Thuja plicata Tsuga heterophylla

Abies amabilis Pseudotsuga menziesii

Betula papyrifera Picea sitchensis

Tsuga mertensiana Pinus contorta

Vaccinium membranaceum Menziesia ferruginea Vaccinium parvifolium Vaccinium alaskaense Vaccinium ovalifolium Chimaphila umbellata Paxistima myrsinites

Acer glabrum Acer circinatum

Mahonia nervosa Rosa gymnocarpa

Lonicera ciliosa Amelanchier alnifolia

Spiraea betulifolia Symphoricarpos albus

Corylus cornuta Holodiscus discolor

Mahonia aquifolium Rosa acicularis

Gaultheria shallon

Clintonia uniflora Cornus canadensis

Goodyera oblongifolia Orthilia secunda

Rubus pedatus Streptopus roseus

Streptopus streptopoides Linnaea borealis Pyrola asarifolia Trientalis latifolia

SHRUB

LAYER

HERB LAYER

western redcedar western hemlock amabilis fir Douglas-fir paper birch Sitka spruce lodgepole pine mountain hemlock black huckleberry false azalea red huckleberry Alaskan blueberry oval-leaved blueberry prince's pine falsebox Douglas maple vine maple dull Oregon-grape baldhip rose western trumpet honeysuckle saskatoon birch-leaved spirea common snowberry beaked hazelnut ocean spray tall Oregon-grape prickly rose salal queen's cup bunchberry rattlesnake-plantain one-sided wintergreen five-leaved bramble rosy twistedstalk small twistedstalk twinflower pink wintergreen broad-leaved starflower

Biogeoclimatic Unit CWHds1 CWHds2 CWHms1 CWHms2 CWHws2 IDFwwT

AB

LE 16. V

egetation table for zonal sites of submaritim

e CW

H variants

and the IDF

ww

40

HERB Polystichum munitum

LAYER Disporum hookeri

Calamagrostis rubescens

Disporum trachycarpum Mycelis muralis

MOSS Hylocomium splendens

Pleurozium schreberi LAYER Rhytidiopsis robusta

Rhytidiadelphus loreus Dicranum fuscescens

Rhytidiadelphus triquetrus Kindbergia oregana

Dicranum pallidisetum

Festuca spp.

sword fern Hooker's fairybells pinegrass fescue rough-fruited fairybells wall-!ettuce step moss red-stemmed feathermoss pipecleaner moss lanky moss curly heron's-bill moss electrified cat's tail moss Oregon beaked moss pale-stalked broom moss

Biogeoclimatic Unit CWHds1 CWHds2 CWHms1 CWHms2 CWHws2 IDFww

TA

BLE

16. (Continued)

41

Biogeoclimatic unit CWHdsl CWHds2 IDFww ~~ CWHmsl

Number of stations Name o f reference Pemberton Alta Lk. Hells Gate

Elevation of reference station (m) 218 668 122 Mean annual range 990 to 2054 1614 to 2109 1415 to 1420 precipitation (mm) ref. stn. 1187 - 1415 1198

May to September range 197 to 350 357 to491 265 to276 precipitation (mm) ref. stn. 224 265 176

Total mean range 193 to 478 139 to 190 609 to 657 annual snowfall (cm) ref. stn. 3 10

- 657 188 Mean annual range 6.4 to 9.7 temperature (°C) ref. stn. - 7.2 5.7 9.2

Mean temperature o f range -0.4 to -6.6 -1.8 to -2.8 the coldest month (°C) ref. stn. -5.6

Extreme minimum range -4.4 -2.6

temperature (°C) ref. stn. -30.0 - -30.6 -27.8 Mean temperature of range 15.3 to 18.7 16.1 to 16.5 the warmest month (°C) ref. stn. 18.7 15.3 20.4

Extreme maximum range 36.7 to 40.0 33.9 to 37.8 - temperature (ºC) ref. stn. 39.4 - 36.1 40.6

Growing degree-days range 1732 to 2130 1591 to 1626 > 5 (°C) ref. stn. 1817 - 1279 2194

Frost-free period range 128 to 225 161 to 198

7a 2b 2 1c

station BCFS

-

-

-

7.5 to 7.7 - -

- -

-

-24.4 to -40.0 -22.2 to -28.9 - -

- -

- -

(days) ref. stn. - 116 204 -

150 -

a Temperature data based on 5 stations. b Both stations are near CWHms2. c Station is from lower part of subzone.

No data.

TA

BLE

20. Clim

atic data for certain submaritim

eC

WH

variants and the IDF

ww45

–

–

–

49

4.4 CWHds2 - Central Dry Submaritime CoastalWestern Hemlock Variant

DISTRIBUTION: The CWHds2 occurs at low elevations in submaritimeand subcontinental areas north of the head of Knight Inlet. Its majoroccurrences include the lower Klinaklini, Bella Coola, Talchako, andDean valleys. Elevational limits range from valley bottom toapproximately 500 m.

CLIMATE (Table 20): The CWHds2 has a climate transitional between thecoast and interior, characterized by warm, dry summers and moist, coolwinters with moderate snowfall. Growing seasons feature water deficitson zonal sites.

VEGETATION (Table 16): Forests on zonal sites are dominated by Fd,Hw, Cw, and minor paper birch. The understorey is characterized byrelatively poorly developed shrub and herb layers featuring some Douglasmaple and minor amounts of queen's cup, with a well-developed mosslayer dominated by Hylocomium splendens, Rhytidiadelphus triquetris,and minor amounts of Rhytidiopsis robusta and Pleurozium schreberi.

DISTINGUISHING ADJACENT UNITS FROM THE CWHds2 (using zonalsites)

CWHms2 - occurs adjacent and above; it has:• common Ba and Alaskan blueberry

CWHws2 - occurs adjacent and above; it has:• common Ba and Alaskan blueberry

IDFww - occurs adjacent to the east; it has• much less Hw• more falsebox• well-developed shrub layer with a mix of species (e.g., tall Oregon-

grape, baldhip rose, western trumpet honeysuckle, saskatoon, birch-leaved spirea, beaked hazelnut, etc.)

75

5.2 Site Classification Grids and VegetationSummary Tables

TABLE 21. Index of site classification grids

Gridno.

Site category Biogeoclimatic unit

1 General CDFmm 2 General CWHdm 3 General CWHds1 4 General CWHds2 5 General CWHmm1 6 General CWHmm2 7 General CWHms1 8 General CWHms2 9 General CWHvh110 General CWHvh211 General CWHvm112 General CWHvm213 General CWHwh114 General CWHwh215 General CWHws216 General CWHxm17 General ESSFmw18 General IDFww19 General MHmm120 General MHmm221 General MHwh22 Special - Floodplains CDFmm23 Special - Floodplains CWHdm,CWHds1,CWHxm24 Special - Floodplains CWHds225 Special - Floodplains CWHmm126 Special - Floodplains CWHms1,CWHms227 Special - Floodplains CWHwh128 Special - Floodplains CWHvh1,CWHvh229 Special - Floodplains CWHvm130 Special - Floodplains CWHws231 Special - Fluctuat water table CDFmm32 Special - Fluctuat. water table CWHdm, CWHxm33 Special - Shoreline/ocean spray CWHwh,CWHvh

FLOODPLAINS

Grids No: 22-24

High Bench

Medium Bench

Low Bench

High Bench

Medium Bench

Low Bench

High Bench

Medium Bench

Low Bench

Grid No. 22

CDFmm

07 Cw - Snowberry

08 Act - Red-osier dogwood

09 Act - Willow

Medium to very rich soil nutrient regime

Grid No. 23

CWHdm, CWHds1, CWHxm

08 Ss - Salmonberry

09 Act - Red-osier dogwood

10 Act - Willow

Medium to very rich soil nutrient regime

Grid No. 24

CWHds2

08 Ss - Salmonberry

09 Act - Red-osier dogwood

10 Act - Willow

Medium to very rich soil nutrient regime

135

6.1.6 Recommended tree species grids

TABLE 24. Index of recommended tree species grids

Gridno.

Site category Biogeoclimatic unit

1 General CDFmm 2 General CWHdm 3 General CWHds1 4 General CWHds2 5 General CWHmm1 6 General CWHmm2 7 General CWHms1 8 General CWHms2 9 General CWHvh110 General CWHvh211 General CWHvm112 General CWHvm213 General CWHwh114 General CWHwh215 General CWHws216 General CWHxm17 General ESSFmw18 General IDFww19 General MHmm120 General MHmm221 General MHwh22 Special - Floodplains CDFmm23 Special - Floodplains CWHdm,CWHds1,CWHxm24 Special - Floodplains CWHds225 Special - Floodplains CWHmm126 Special - Floodplains CWHms1,CWHms227 Special - Floodplains CWHwh128 Special - Floodplains CWHvh1,CWHvh229 Special - Floodplains CWHvm130 Special - Floodplains CWHws231 Special - Fluctuat water table CDFmm32 Special - Fluctuat. water table CWHdm, CWHxm33 Special - Shoreline/ocean spray CWHwh,CWHvh

142

Comments: Grid No. 4 CWHds2

GENERAL COMMENTS:

• Se may be more suitable than Ss in the eastern, upper portion of the variant

• high hazard for Sitka spruce weevil; moderate hazard for Armillaria root rot

SPECIFIC COMMENTS:

01 Hw is an alternative to Fd in the wetter portion of the variant

02 marginal sites for timber production

03 Pl is an alternative to Fd; Cw can function as a non-crop (nurse) species

04 Pl is an alternative to Fd

05 Ss is a suitable minor species except in the eastern, upper portion of thevariant where Se is more suitable

06 Fd is an alternative to Hw except on very moist / nutrient very poor to poorsites

07 Ss is an alternative to Fd; Fd should be restricted to elevated microsites onstrongly gleyed soils

11 marginal sites for timber production; elevated microsites are preferred

12 elevated microsites are preferred

VD 0

M D 1

M D 2

S D 3

F 4

M 5

VM 6

W 7

Soil nutrient regime

Poor Poor Medium Rich Rich Very

A B C D E

See comments on facing page

* See grid # 2 4 for site series 08 - 10

Site series

01 HwFd - Cat's-tail moss 06 Hw - Queen's cup

02 FdPl - Kinnikinnick 07 Cw - Devil's club

03 FdHw - Falsebox 11 Pl - Sphagnum

04 Fd - Fairybells 12 CwSs - Skunk cabbage

06 Cw - Solomon's-seal

Very

180

Comments: Floodplain sites Grids No. 24 and 25

GENERAL COMMENTS:

Floodplain sites have high fisheries, wildlife, water, and aesthetic values - refer tothe appropriate guidelines for riparian ecosystem management.

• high bench sites are suited to the following options:

1. conifer management2. hardwood management3. mixed hardwood / conifer management

• medium bench sites are best suited to hardwood management because of thehigh frequency of flooding, severe competition from deciduous trees andshrubs, and the restriction of conifers to elevated microsites. It may bepossible to manage for conifers if elevated microsites occupy a sufficientlylarge portion of the area.

• low bench sites are marginally productive

SPECIFIC COMMENTS:

Grids No.24-25: high hazard for Ss weevil; hardwood management notrecommended on high bench sites with very coarse textured soils (>70% coarsefragment content)

SPECIAL SITES

FLOODPLAINS

Grid No. 24 - 25

Grid No. 24

CWHds2

High Bench

Medium Bench

Low Bench

High Bench

Medium Bench

Low Bench

08 Cw(Ss) Act or Dr

09 Cw(Ss) Act or [Dr]

10 Act

Medium to very rich soil nutrient regime

See comments on facing page

Grid No. 26

CWHmm1

08 CwBa Act or Dr

09 CwBa Act or [Dr]

10 Act

Medium to very rich soil nutrient regime

See comments on facing page

Site series

CWHds2, CWHmm1

08 Ss - Salmonberry

09 Act - Red-osier dogwood

10 Act - Willow

181

Grid No. 3: CWHds1 Grid No. 4: CWHds2

VD 0

MD 1

MD 2

SD 3

F 4

M 5

VM 6

W 7

Soil Nutrient Regime Very Poor Poor Medium Rich Rich A B C D E

VD 0

MD 1

MD 2

SD 3

F 4

M 5

VM 6

W 7

Soil Nutrient Regime Very Poor Poor Medium Rich Rich

A B C D E

Very

FLOODPLAINS

High

Bench

Medium

Bench

Low

Bench

High

Bench

Medium

Bench

Low

Bench

Grid No. 22

CDFmm

Grid No. 24

CWHds2

SI class for Act in square.

Grid No. 23

CWHdm, CWHds1, CWHxm

High Bench

Medium

Bench

Low

Bench

High

Bench

Medium

Bench

Low

Bench

Grid No. 25

CWHmm1

FLOODPLAINS

High

Bench

Medium

Bench

Low

Bench

High

Bench

Medium

Bench

Low

Bench

Grid No. 22

CDFmm

Grid No. 24

CWHds2

SI class for Act in square.

Grid No. 23

CWHdm, CWHds1, CWHxm

High Bench

Medium

Bench

Low

Bench

High

Bench

Medium

Bench

Low

Bench

Grid No. 25

CWHmm1

282

APPENDIX 8. Correlation of old and newbiogeoclimatic and site units.

TABLE A-1. Biogeoclimatic units

Newsymbol

New name Oldsymbol a

CDFmm Moist Maritime CDF CDFaCWHdm Dry Maritime CWH CWHa2CWHds1 Southern Dry Submaritime CWH CWHc1CWHds2 Central Dry Submaritime CWH CWHc2, h1, h2CWHmm1 Submontane Moist Maritime CWH CWHb3CWHmm2 Montane Moist Maritime CWH CWHb4CWHms1 Southern Moist Submaritime CWH CWHb5CWHms2 Central Moist Submaritime CWH CWHb6, h3CWHvh1 Southern Very Wet Hypermaritime

CWHCWHd1

CWHvh2 Central Very Wet HypermaritimeCWH

CWHd2,CCPH

CWHvm1 Submontane Very Wet MaritimeCWH

CWHb1, i1

CWHvm2 Montane Very Wet Maritime CWH CWHb2, i2CWHwh1 Submontane Wet Hypermaritime

CWHCWHe1, g1

CWHwh2 Montane Wet Hypermaritime CWH CWHe2, g2CWHws2 Montane Wet Submaritime CWH CWHb7, f2, i3CWHxm1b Eastern Very Dry Maritime CWH CDFbCWHxm2b Western Very Dry Maritime CWH CWHa1ESSFmw Moist Warm ESSF ESSFfIDFww Wet Warm IDF IDFeMHmm1 Windward Moist Maritime MH MHa, dMHmm2 Leeward Moist Maritime MH MHb, eMHwh Wet Hypermaritime MH MHc, f

a From Yole et al. (1982), Banner, et al. 1983, Green, et al. (1984), Pojar et al.(1988).b Combined into CWHxm in this guide because of floristic and managementsimilarities.

APPENDIX 8. ( Continued )

TABLE A-2. Site units

2 CWHdm 8 CWHa2

3 CWHds1 18 CWHc1

4 CWHds2 17 CWHc2

5 CWHmm1 11 CWHb3

6 CWHmm2 12 CWHb4

7 CWHms13

13 CWHb5

8 CWHms2 3 14 CWHb6

9,10 CWHvh, 18 CWHd

11 CWHvm1 9 CWHb1

12 CWHvm2 10 CWHb2

13,14 CWHwh *

15 CWHWS2 3 15 CWHb7i

16 CWHxm4 '7 CWHa1

17 ESSFmw5

3 ESSFf

18 IDFww6

4,5 lDFe

19 MHmm1 1 MHa

20 MHmm2 2 MHb

21 MHwh *

* No equivalent in Green et al. (1984) 1 New site series includes portions of old site units 1 and 3

New site series includes portions of old site units 2 and 4 3 No new equivalent for old site unit 3

CWHxm most closely represents the old CWHa1 5 No new equivalent for old site units 3,5, and 8 6 No new equivalent for old site units 2,5,7, and 8 7 New site series includes old site units 1 and 2

New grid # Old grid # and and

BGC unit BGC unit

1 CDFmm 6 CDF

283

4