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Wood properties of sawn timber of Norway spruce ( Picea abies (L.) Karst.) grown under wide spacing Franka Brüchert, Florian Frisch, Udo H. Sauter IUFRO All Division 5 Conference, Taipei. Introduction. - PowerPoint PPT Presentation
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Abteilung Waldnutzung Wood properties of sawn timber of Norway spruce (Picea abies (L.) Karst.) grown under wide spacing Franka Brüchert, Florian Frisch, Udo H. Sauter IUFRO All Division 5 Conference, Taipei
Transcript
Page 1: Introduction

AbteilungWaldnutzung

Wood properties of sawn timber

of Norway spruce (Picea abies (L.)

Karst.) grown under wide spacing

Franka Brüchert, Florian Frisch, Udo H.

Sauter

IUFRO All Division 5 Conference, Taipei

Page 2: Introduction

AbteilungWaldnutzung

“ If we regard future-crop trees

rather as tamed solitaries than

as partially unshackled captives,

then science must also more

intensly address research on

solitary trees.“

ABETZ 1987

Introduction

Page 3: Introduction

AbteilungWaldnutzung

Silvicultural alternatives

2 trees per site

alternative

A

350 / ha

age 28-29

alternative

B

700 / ha

age 27-29

alternative

FA

1600 / ha

age 42

isolation at age ~ 15 years

Page 4: Introduction

AbteilungWaldnutzung

Test material

stem

dis

c at

1

.30

m

stem

dis

c at

5 m

4 m log, split to 2x2m

2 short logs (1.37 – 2.06 m)

44 cants

5 x 10 cm²

78 laths

3 x 6 cm²

Page 5: Introduction

AbteilungWaldnutzung

Results “Roundwood“

Page 6: Introduction

AbteilungWaldnutzung

Roundwood quality

0 %

25 %

50 %

75 %

100 %

A B C D A B C D

BW grading rules ENV 1927-1: 1998

grade

pro

po

rtio

n o

f lo

gs

in

gra

de

cla

ss

[%

]

alternative A

alternative B

alternative FA

down-grading reasons: knots, ring width, compression wood

Page 7: Introduction

AbteilungWaldnutzung

Branchiness of roundwood

alternative A & B: ca. 80% sound knotsalternative FA : 7.5% sound knots

22.3

34.4

38.7

0

20

40

A B FA

alternative

larg

est

bra

nch

[m

m] threshold

between grade B and C

Page 8: Introduction

AbteilungWaldnutzung

Ring width of roundwood

7.37.9

4.0

0

2

4

6

8

10

A B FA

alternative

rin

g w

idth

wit

ho

ut

juven

ile w

oo

d

[mm

]

threshold between

A & B

threshold between

grade B & C

threshold S 7/ S 10

Page 9: Introduction

AbteilungWaldnutzung

Results “Sawn timber“

Page 10: Introduction

AbteilungWaldnutzung

threshold S 13/ S 10: wide side: 20mm narrow side: 10mm

threshold S 10/ S 7 : wide side: 40mm narrow side: 20mm

26,722,6

17,8

0

10

20

30

A B FA

alternative

mea

n d

iam

eter

of

thic

kest

bra

nch

[m

m]

Knot dimension of sawn timber

Page 11: Introduction

AbteilungWaldnutzung

Knottiness of sawn timber

0

25

50

75

100

S 13 S 10 S 7 S 0 S 13 S 10 S 7 S 0

cant lath

grade

pe

rce

nta

ge

of

pie

ce

s i

n

gra

din

g c

las

s [

%]

A

B

FA

S 0 = reject

Page 12: Introduction

AbteilungWaldnutzung

Ring width of sawn timber (cants)

7,2 7,2

3,7

0

2

4

6

8

A B FAalternative

rin

g w

idth

[m

m]

threshold between

S13 & S10

treshold between S10 & S7

Page 13: Introduction

AbteilungWaldnutzung

Ring width of sawn timber

0

25

50

75

100

S 13 S 10 S 7 S 0 S 13 S 10 S 7 S 0

cant lath

grade

pe

rce

nta

ge

of

pie

ce

s i

n

gra

din

g c

las

s [

%]

A

B

FA

S 0 = reject

Page 14: Introduction

AbteilungWaldnutzung

Twist of sawn timber

0

25

50

75

100

S 13 S 10 S 7 S 0 S 13 S 10 S 7 S 0

cant lath

grade

pe

rce

nta

ge

of

pie

ce

s i

n

gra

din

g c

las

s [

%]

A

B

FA

S 0 = reject

Page 15: Introduction

AbteilungWaldnutzung

Wood density, MOE & MOR of sawn timber

Page 16: Introduction

AbteilungWaldnutzung

Quality trend for future?

branches

ringwidth

density

juvenile core

??


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