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H. J. Andrews Experimental Forest, OR (photo by Al Levno)

H. J. Andrews Experimental Forest, OR (photo by Al Levno)

H. J. Andrews Experimental Forest, OR (photo by Al Levno)

H. J. Andrews Experimental Forest, OR (photo by Al Levno)

H. J. Andrews Experimental Forest, OR (photo by Al Levno)

Wind River Experimental Forest, WA (photo by Jay Sexton)

Table 1. Site Climate Characteristics.

Table 2. Type of measurement made at each study site.

Table 3. Decomposition rates estimated from chronosequence.

Table 4. Decomposition rates estimated from decomposition vectors.

Table 5. Decomposition rates estimated by regression of time series.

Table 6. Best estimate of decomposition rates using all methods.

Table 7. Decay resistance rating of species based on Wood Handbook.

Table 8. Estimates of Q10 (Quotient 10) for various genera.

Table 9. Decomposition rates of western conifer species reported in the literature.

Table 1. Site Climate Characteristics

Mean annual Temperature Mean Annual Precipitation

Site Degrees C Degrees F MM Inches

CHEF 10 50 2489 98

FEF 0.5 34 737 29

HJAF 10 49 2500 98

FRIS 6.7 44 2221 87

KRD 4 40 1054 42

PFEF 7 45 813 32

SQNP 8 46 1255 49

WREF 8.7 47 2467 97

WSR 8.3 47 1778 70

Table 2. The type of measurements made at each study site.

Location Type of Measurements Number of measurements

CHEF decay classes, decomposition vector 2 times

FEF chronosequence 2 times

HJAF time series 5-9 times depending on species

FRIS chronosequence 1 time

KRD chronosequence 1 time

PFEF time series 3 times

SQNP decay classes, decomposition vector 2 times chronosequence for Abco

WSR time series 1 time

WREF decay classes, decomposition vector 2 times

Table 3. Decomposition rates estimated by regression of chronosequence.

Site	Species	k	stderr	r²	N
FEF	Abla	0.035	0.003	0.87	13
FEF	Pico	0.023	0.002	0.85	16
FEF	Pien	0.028	0.002	0.99	1
FRIS	Abpr	0.023	0.004	0.59	8
KRD	Abco	0.035	0.003	0.71	28
KRD	Abma	0.043	0.004	0.73	30
SQNP	Abco	0.051	0.004	0.65	47
SQNP	Cade	0.037	0.009	0.83	6
SQNP	Pila	0.018	0.004	0.57	8

Table 4. Decomposition rates estimated from decomposition vectors.

SITE	Species	k	N	MIN	MAX
CHEF	Alru	0.055	12	0.028	0.118
CHEF	Pisi	0.023	15	<0.005	0.055
CHEF	Tshe	0.023	12	<0.005	0.059
FEF	Abla	0.025	13	<0.005	0.073
FEF	Pico	0.025	16	<0.005	0.078
SQNP	Abco	0.073	9	0.051	0.117
SQNP	Pije	0.042	9	<0.005	0.098
SQNP	Pila	0.036	4	0.013	0.085
WREF	Psme	0.014	16	0.008	0.0198
WREF	Tshe	0.018	34	0.015	0.021

Table 5. Decomposition rates estimated by regression of time series

Site	Species	K	stderr	r²	N
HJAF	Abam	0.051	0.03	0.93	11
HJAF	Alru	0.083	0.012	0.90	15
HJAF	Psme	0.015	0.001	0.85	11
HJAF	Thpl	0.007	0.002	0.43	11
HJAF	Tshe	0.026	0.002	0.92	11
PFEF	Abgr	0.038	0.009	0.89	7
PFEF	Pico	0.042	0.011	0.89	6
PFEF	Pimo	0.035	0.012	0.84	4
PFEF	Pipo	0.011	0.005	0.85	7
WSR	Abpr	0.030	0.009	NA	8

Table 6. Best estimate of decomposition rates using all methods.

SITE	Species	k	uncertainty
CHEF	Alru	0.055	medium
CHEF	Pisi	0.023	medium
CHEF	Tshe	0.023	medium
FEF	Abla	0.035	medium
FEF	Pico	0.023	medium
FEF	Pien	0.028	high
FRIS	Abpr	0.023	medium
HJAF	Abam	0.051	low
HJAF	Alru	0.083	low
HJAF	Psme	0.015	low
HJAF	Thpl	0.007	low
HJAF	Tshe	0.026	low
KRD	Abco	0.035	medium
KRD	Abma	0.043	medium
PFEF	Abgr	0.038	medium
PFEF	Pico	0.042	medium
PFEF	Pimo	0.035	medium
PFEF	Pipo	0.011	high
SQNP	Abco	0.051	medium
SQNP	Cade	0.02	high
SQNP	Pije	0.042	medium
SQNP	Pila	0.036	high
WREF	Psme	0.014	medium
WREF	Tshe	0.018	medium
WSR	Abpr	0.030	medium

Table 7. Decay resistance rating of species based on Wood Handbook.

Species Common name Code Decay resistance

Abies amabilis Pacific silver fir Abam none

Abies concolor White fir Abco none

Abies lasiocarpa Subalpine fir Abla none

Abies magnifica Shasta red fir Abma none

Abies procera Noble fir Abpr none

Alnus rubra Red alder Alru none

Calocedrus decurrens Incense cedar Cade high

Picea engelmannii Engelmann spruce Pien none

Picea sitchensis Sitka spruce Pisi none

Pinus contorta Lodgepole pine Pico slight

Pinus jeffreyi Jeffrey pine Pije slight

Pinus lambertiana Sugar pine Pila moderate

Pinus monticola Western white pine Pimo moderate

Pinus ponderosa Ponderosa pine Pipo slight

Pseudotsuga menziesii Douglas-fir Psme moderate

Thuja plicata Western redcedar Thpl high

Tsuga heterophylla Western hemlock Tshe none

Table 8. Estimates of Q10 (Quotient 10) for various genera.

Genus Q10

Abies 1.46

Pinus 2.13

Pseudotsuga 8.24

Tsuga 10.7

Table 9. Decomposition rates of western conifer species reported in the literature.

Species Site k (per year) Source

Abies concolor SQNP 0.051 Harmon et al. 1987

Picea sitchensis Olympics 0.011 Graham & Cromack 1982

Pinus contorta Wyoming 0.012 Fahey 1982

Pinus contorta Central Oregon 0.027 Busse 1994

Pseudotsuga menziesii HJAF & WREF 0.012-0.014 Graham 1982

Pseudotsuga menziesii HJAF 0.007 Means et al. 1985

Pseudotsuga menziesii HJAF 0.016 Sollins et al. 1987

Thuja plicata HJAF 0.009 Sollins et al. 1987

Tsuga heterophylla HJAF 0.016 Sollins et al. 1987

Tsuga heterophylla HJAF & WREF 0.012-0.024 Graham 1982

Tsuga heterophylla Olympics 0.010 Graham & Cromack 1982

Tsuga heterophylla CHEF 0.008 Grier 1978

Figures

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