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Table 12.4: Estimated change in native vegetation and other native land-cover classes (1997 and 2002) using satellite imagery (LCDB 1 and LCDB 2) and the extent of legal protection for each land cover class

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Native land cover class Area (hectares) Percentage difference (%) Area legally protected in 2006
1997 2002 Hectares Percentage of 2002 area (%)

Alpine grass/herbfield

224,400

224,400

0.00

181,100

80.72

Broadleaved native hardwoods

546,200

539,600

–1.22

199,500

36.97

Depleted grassland

250,500

250,500

0.00

33,300

13.29

Fernland

51,800

51,700

–0.15

8,200

15.82

Flaxland

6,500

6,500

0.00

3,600

55.83

Grey scrub1

72,500

72,400

–0.06

9,800

13.52

Herbaceous freshwater vegetation

88,800

88,700

–0.13

41,400

46.71

Herbaceous saline vegetation

19,300

19,200

–0.45

6,700

34.8

Native forest

6,459,400

6,457,000

–0.04

5,136,600

79.55

Mangrove

26,000

26,000

0.00

2,600

9.8

Mānuka and/or kānuka

1,191,600

1,186,200

–0.45

362,800

30.59

Matagouri2

29,500

29,500

–0.02

3,100

10.32

Sub-alpine shrubland

385,400

385,400

0.00

314,200

81.53

Tall tussock grassland

2,397,100

2,394,600

–0.10

1,175,500

49.09

Total native vegetation cover

11,748,900

11,731,700

–0.15

7,478,300

63.74

Alpine gravel and rock

698,000

698,100

0.01

506,400

72.53

Coastal sand and gravel

51,300

51,300

–0.07

18,900

36.8

Estuarine open water

92,500

92,500

0.00

3,600

3.86

Lake and pond

356,800

357,500

0.20

121,500

33.98

Landslide

17,000

17,000

–0.26

11,600

68.16

Permanent snow and ice

111,000

111,000

0.00

109,200

98.43

River

81,900

81,900

0.00

18,100

22.09

River and lakeshore gravel and rock

179,700

179,700

0.00

45,900

25.56

Total other native land cover

1,588,400

1,589,100

0.04

835,100

52.56

Total native land cover

13,337,300

13,320,800

–0.12

8,313,446

62.41

Notes:

(1) Grey scrub is a classification for areas covered with small-leaved shrubs such as small-leaved Coprosma species.

(2) Matagouri (Discaria toumatou) is a thorny shrub found in open, moist areas, which is known to invade pastures.

(3) Figures rounded to the nearest 100 hectares. Percentages are calculated from unrounded figures.

(4) Any discrepancies between hectares shown for land-cover classes and totals shown on this table are due to rounding.

Data source: Landcare Research.