Skip to main content

Table 1 Statistics of amounts of sanitary felling due to Ips typographus infestation during the period 1998–2004 in the study region in the Western Beskids Mts

From: Persisting bark beetle outbreak indicates the unsustainability of secondary Norway spruce forests: case study from Central Europe

Year

N

Mean

Median

Minimum

Maximum

25% quartile

75% quartile

Sum

1998

398

55.1/2.8

27.1/1.6

0.3/0.01

810.1/74

4.1/0.4

64.2/3.9

22,056

1999

1,118

59.3/2.9

21.1/1.7

0.6/0.01

2,011.2/100

2.3/0.4

141.4/3.9

66,170

2000

775

40.7/2.6

11.4/1.4

0.2/0.01

499.6/98

3.6/0.3

45.5/3.2

31,006

2001

757

29.2/1.9

5.1/1.2

0.8/0.01

691.4/100

2.4/0.2

31.9/2.6

22,159

2002

658

29.6/1.8

7.2/1.2

0.4/0.01

629.3/100

2.2/0.3

36.8/2.1

19,478

2003

1,012

50.3/2.4

21.6/1.4

0.4/0.01

600.1/100

6.1/0.4

63.4/3.8

50,970

2004

1,782

120.5/5.3

50.1/2.9

0.3/0.01

1,782.2/100

19.7/0.9

131.5/5.2

138,013

  1. N number of forest compartments with reported sanitary felling; sum total felled volume; absolute amount of felling (m3)/per cent of felled volume out of total volume of spruce in a stand (m3/m3 × 100)