Table 1 Classification of some survey items in the Forest Resource Planning and Design Survey (FRPDS)
Survey items | Classification | Description |
|---|---|---|
Land-use type | Forest land | Areas for forestry ecological construction, production and management, with a minimum area of 667 m2 |
Cropland | Cultivated land, farmland, includes two sub-classes: paddy and dryland | |
Grassland | Pasture, rangeland, grassland | |
Inland water and wetland | Lakes, rivers, reservoirs, wetland, and other water bodies | |
Built-up land | Areas for residential, industrial, commercial, mining, traffic and transport, tourist facilities, parking sites, gardens and parks | |
Bare land | Unused and unproductive land surface with vegetation coverage ≤ 5% | |
Forest land type | Arbour forest land | Forest land composed of arbour species, with a crown density ≥ 20%; or a crown density < 20% but retention rate ≥ 80% with steadily growing young trees in planted stands |
Sparse forest land | Forest land composed of arbour species, with a crown density of 10–19% | |
Bamboo forest land | Forest land composed of bamboos with a minimum diameter at breast height (DBH) of 2Â cm | |
Shrub forest land | Forest land with a minimum crown cover of shrub species of 30%; includes two sub-classes: special shrubs and general shrubs | |
Other forest land | Unclosed afforestation land, nursery land, clear-cut land, burned forest land, and planned forest land | |
Plant type | Arbour species | Trees that have a distinct trunk, with tree height > 5 m and DBH > 5 cm at maturity; includes three sub-classes: coniferous species (i.e. softwoods), broad-leaved species (i.e. hardwoods), and mixed tree species |
Bamboo species | A kind of tall tropical plants with hard, hollow stems | |
Economic plant species | Arbours and shrubs mainly for the production of fruit, edible oil, drinks, flavourings, industrial raw materials, and medicinal materials | |
Shrub species | Large plants that have several woody stems coming from the ground, in addition to the economic shrub species | |
Age class | – | Classification for tree or stand age by a certain number of years according to the forest management requirements and biological characteristics of tree species, denoted by roman numerals I, II, III, IV, V, etc., from young to old; the number of years included in each age class is called the age class period |
Age group | Young | Stand ages that at the youngest stage in tree growth, with stand age in age class I or I–II; the growth of trees is slow in their infancy and increases rapidly after canopy closure |
Middle-aged | Stand ages that have reached the age class lower one or two age class periods than the near-mature age group; trees grow vigorously in diameter, with flowering and fruiting | |
Near-mature | Stand ages that have reached the age class lower one age class period than the mature age group; trees slowdown in growth and are close to be maturely utilised | |
Mature | Stand ages that have reached the age class or one age class period older for harvest; trees are in full maturity and are able to be harvested | |
Post-mature | Stand ages that have reached the age class older than the mature age group; trees are being senescent |