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Chapter 2 HABITAT MAPPING CATEGORIES

2.1

Finalisation of Habitat Mapping Categories

Habitat categories were developed based on list of land use categories plotted on the WWF habitat map and refined based on the comments received from the Government Departments, and consultation with HKU Biodiversity Survey Team specialists and satellite imagery/aerial photograph experts. A total of 25 habitat categories has been identified and used for mapping.

In initiating work on developing an appropriate list of habitat categories to be mapped, the SUSDEV 21 Study Team began with the original 34 vegetation and land use categories plotted on the WWF habitat map which is based on 1989 data and which was published in 1992 (see Table 9.5a for the 34 land cover categories). These categories were generalised, in some cases, into 27 broader classes (Table 2.1a) which were believed to be more useful, and were supplemented by additional categories to cover coastal areas and more specific land uses such as fishponds and landfills. The resulting list of categories was presented in the Draft Inception Paper for Government review and comment.

At the request of Water Supplies Department, the category "Reservoir" has been moved as an individual category for mapping. As proposed in the Final Inception Paper, reservoirs will be mapped under the category "Modified Watercourse". The list of habitat mapping categories was further revised based on comments received from the ESMG, and consultation with HKU Biodiversity Survey Team specialists and satellite imagery/aerial photograph experts. A total of 23 mapping categories (Table 2.1a) was proposed and presented in the Final Inception Paper.

The list of habitat categories to be mapped has been further modified since production of the Final Inception Paper based on continuing liaison with the HKU Biodiversity Survey Team and satellite imagery/aerial photograph experts. The formal proposed list of categories was presented in Topic Report 1 (TR1) and the definition and rationale for each category (by habitat/feature type) was also discussed in the report. There was a total of 26 habitat categories proposed for mapping and which are listed in Table 2.1a.

As mentioned in Topic Report 2 (TR2), the "Buildings" category could not be successfully identified using classification techniques for preparing the preliminary habitat map, the category was subsumed into the "Other" category. The amendment is unlikely to have effect on the objective of habitat mapping since both categories have indicatively been assigned an ecological value of "negligible" (TR1). Therefore, there was a total of 25 categories mapped on the habitat map.

Table 2.1a Habitat Categories Developed for SUSDEV 21 Habitat Mapping Baseline Survey
Draft Inception Paper	Final Inception Paper	Draft Topic report 1	Final Topic Report 1
Bare rock or soil Grassland (includes short or tall grass, fern and bamboo)	Bare rock or soil Grassland (without visible woody plants) Grassland (with woody plant cover less than 50%)	Bare rock or soil "Early" grassland (without visible woody plants) "Late" grassland (with woody plant cover < 50%)	Bare rock or soil Grassland (without visible woody plants) Shrubby grassland (with woody plant cover < 50%)
Woodland Plantation woodland Tall shrubland Tall shrub/ grassland Tall shrub/ plantation woodland Tall shrub/Low shrub Low shrubland Low shrub/ plantation woodland Low shrub/ grassland	Forest dominated by native species and Fung Shui Woods over 60 years old Montane forest (above 500-600 metres above sea level) Lowland secondary forest (below 500 - 600 metres above sea level) Plantation woodland Shrubland (grass less than 50%, shrubs the major woody form)	Fung shui forest over 60 years old ad dominated by native species Montane forest (above 600 metres above sea level) Lowland forest (below 600 metres above sea level) Plantation or Plantation/mixed forest Mixed shrubland (grass < 50%, shrubs the major woody life form) Baeckia shrubland	Mixed shrubland (grass < 50%, shrubs the major woody life form) Baeckia shrubland Fung shui forest over 60 years old ad dominated by native species Montane forest (above 600 metres above sea level) Lowland forest (below 600 metres above sea level) Plantation or Plantation/mixed forest
Freshwater marsh	Freshwater or brackish marsh/wetland	Fishpond/Gei wai Watercourse (unmodified) Watercourse (modified)	Fishpond/Gei wai Natural watercourse
Reservoir			Modified watercourse
Mangrove Intertidal mudflat Seagrass Sandy shore Rocky shore	Mangrove Intertidal mudflat Seagrass Sandy shore Rocky shore	Mangrove Intertidal mudflat Seagrass Sandy shore Rocky shore Artificial rocky/hard shoreline	Mangrove Intertidal mudflat Seagrass bed Sandy shore Rocky shore Artificial rocky/hard shoreline
Cultivation Abandoned cultivation (flat valley land)	Cultivation Abandoned cultivation (flat valley land)	Cultivation Abandoned cultivation	Cultivation
Golf course Rural industrial storage (containers) Buildings Quarry Landfill Other (urban or other highly modified habitat)	Golf course Rural industrial storage (containers) Buildings Quarry Landfill Other (urban or other highly modified habitat)	Golf course/Urban park Rural industrial storage/containers Buildings Quarry Landfill Other (urban or other highly modified habitat)	Golf course/Urban park Rural industrial storage /containers Buildings Quarry Landfill Other (urban or other highly modified habitat)
Total categories: 27	23	27	26

In addition to the habitat and features listed above, a number of additional features was also digitised and included on the habitat map. These additional features include:

the boundaries of Marine Parks and Reserves;
the boundaries of Country Parks;
the boundaries of Special Areas;
the boundaries of Sites of Special Scientific Interest;
the boundaries of the Mai Po Inner Deep Bay Ramsar Site;
the boundaries of the Wetland Conservation Area and Wetland Buffer Area;
the boundaries of nature reserves outside of Country Parks (including Mai Po Nature Reserve, Tai Po Kau Nature Reserve and Kadoorie Farm); and
documented observations of "rare" species (1).

2005

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最近修訂日期: 二零零五年十二月二十二日