Post on 19-Jan-2016
transcript
Richard Thompson and Nancy Densmore
January 2007
2005 Stand Level Biodiversity Final Report
“Proof of Concept”
Question?Question?
Is the structural retention (WT and CWD) left associated with cutblocks adequately maintaining habitat for dependent species at the site and across the landscape now and in the future?
Is the structural retention (WT and CWD) left associated with cutblocks adequately maintaining habitat for dependent species at the site and across the landscape now and in the future?
Stand Level BiodiversityStand Level Biodiversity
What are we measuring?What are we measuring?
•% area retained•Tree size •Wildlife tree class•tree species•CWD Size•CWD decay class•Ecological Anchors – e.g. large hollow trees, bear dens •Windthrow•Invasive Species
How are we measuring it?How are we measuring it?
Standardized protocolPlot base and overviewRandomized designQuality assurance
Protocol Available on the Web:http://www.for.gov.bc.ca/hfp/frep/values/biodiversity.htm
Standardized protocolPlot base and overviewRandomized designQuality assurance
Protocol Available on the Web:http://www.for.gov.bc.ca/hfp/frep/values/biodiversity.htm
2005 Provincial Sample2005 Provincial Sample
Summary of retention levels (hectares) on 201 sampled cutblocks
ATotal gross block area 6,916
B Total patch retention area (includes 33 hectares of temporary patch retention)
932
C Total dispersed retention area1 (includes 99 hectares of temporary dispersed retention)
385
D Total rotational Patch area2 899
E Total rotational Patch area2 considered unconstrained3 471
F Total rotational dispersed area1 2 286
Average Indicator Value by BECAverage Indicator Value by BEC
BEC Zone Blocks Sampled (ave % retained)
Vet Trees #/ha of patch
Ecological Anchors #/ha of patch
Large Dead trees #/ha of total retention
Large trees live and dead #/ha of total retention
BWBS 16 (15%) 0.4 3.5 16.2 14.3
CDF 1 (24%) 12 4.2 0.4 51.8
CWH 47 (24% 15.5 5.1 28.1 74.2
ESSF 14 (14%) 0.5 1.8 63.7 16.4
ICH 6 (30%) 0.3 0.7 24.1 57.5
IDF 20 (37%) 22 5.7 1.9 9.7
MH 3 (20%) 2.7 2.7 46.4 93.6
MS 7 (26%) 3 3.0 2.5 5.7
SBPS 15 (7%) 0 0.6 26.0 0.3
SBS 72 (14%) 2.8 2.3 22.3 11.5
Distribution of baseline indicator dataDistribution of baseline indicator data
0.020.040.060.080.0
100.0120.0
0.0 5.0 10.0 15.0 20.0 25.0
Trees > 50 cm dbh (sph)
Cu
mu
lati
ve f
req
uen
cy
(% b
lock
s)
Retained species abundance SBS blocksRetained species abundance SBS blocks
0.0
20.0
40.0
60.0
80.0
<4 species 4 species 5 species >5 species
categories of tree species abundance
% s
amp
led
cu
tblo
cks
baseline
WT class 3 or higher, dbh >30 cm and height >10m for 72 SBS blocks
WT class 3 or higher, dbh >30 cm and height >10m for 72 SBS blocks
0.010.020.030.040.050.060.0
<2.1sph 2.1-6.1 sph 6.1-17.6sph
>17.6 sph
abundance of large dead trees
% s
amp
led
cu
tblo
cks
Comparison of Data on Large Dead Tree Abundance for Kolmogorov-Smirnov test
Comparison of Data on Large Dead Tree Abundance for Kolmogorov-Smirnov test
0
20
40
60
80
100
0 25 50 75 100 125 150
Wildlife tree class 3+, DBH 30cm+, height 10m+ (stems per ha)
Cum
ulat
ive
freq
uenc
y (%
)
2005 SLBD
Cruise (equally w eighted blocks)
SBS
CWD Patch/Harvest VolumeCWD Patch/Harvest Volume
0.010.020.030.040.050.060.0
<33.7 33.7-92.9
92.9-206.1
>206.1
categories of CWD volume (m3/ha)
% o
f sa
mp
led
cu
tblo
cks
Patch
Harvestbaseline
CWD Patch/Harvest LengthCWD Patch/Harvest Length
0.020.040.060.080.0
<7.6 7.6-64.0
64.0-155.3
>155.3
Density categories of CWD pieces >10m (SPH)
% o
f sa
mp
led
cu
tblo
cks
Patch
Harvestbaseline
Categories of windthrow 70 SBS cutblocksCategories of windthrow 70 SBS cutblocks
0.0
20.0
40.0
60.0
80.0
>30% 16-30 5-15% <5%
categories of windthrow
% o
f sa
mp
led
cu
tblo
cks
Patch location 69 SBS BlocksPatch location 69 SBS Blocks
:
0.0
10.0
20.0
30.0
40.0
50.0
none external edge internal
Patch location in relation to cutblock
% o
f sam
pled
cu
tblo
cks
SummarySummary
Trend or indicator Good for Biodiversity
Risky for Biodiversity
13.7% overall retention (32% <75 retention, 10% >30% retention)
X
42% of blocks with large patches X
9% of blocks with external non-contiguous patches
X
7% of blocks with zero retention X
84% of blocks have patch retention X
63% of blocks with 3 or less tree species retained
X
43% of blocks with few large trees X
51% of blocks with many large trees X
CWD volume comparable patch to harvest area and baseline
X
Long pieces of CWD less common in harvest area compared to retention patches and baseline
X
Where to Next? Where to Next?
Data sets continue to be built
Data Management Systems being built
Work to build baselines
Work to put stand structure into landscape
Data sets continue to be built
Data Management Systems being built
Work to build baselines
Work to put stand structure into landscape