Table 2 Major disturbance types/forest managements in Guizhou’s forest and their description and generation rules
Disturbance type | Land-use type at last year | Land-use type at current year | Age at last year | Age at current year | Current stand origin | Description | Acronym |
|---|---|---|---|---|---|---|---|
Afforestation | Non-forest | Forest land | – | 1 | Planted | Non–forest land converted to forest land, and the stand was established by afforestation | AF |
Natural expansion of forest | Non-forest | Forest land | – | 1 | Natural | Non-forest land converted to forest land, and the stand was initiated naturally | NE |
Deforestation for agriculture | Forest land | Cropland | – | – | – | Forest land converted to cropland after deforestation, which is usually accompanied by salvage, uprooting and burn in Guizhou | DFA |
Deforestation for built-up land | Forest land | Built-up land | – | – | – | Forest land converted to built-up land after deforestation thoroughly | DFB |
Forest conversion to grassland | Forest land | Grassland | – | – | – | Forest land converted or degraded to grassland owing to human activities or natural causes | FCG |
Forest conversion to waters | Forest land | Inland water and wetland | – | – | – | Forest land converted to wetland or reservoirs owing to human activities or natural causes | FCW |
Forest degradation to bare land | Forest land | Bare land | – | – | – | Forest land converted or degraded to bare land owing to human activities or natural causes | FDB |
Harvest logging | Forest land | Forest land | > = harvest age | – | – | A forest management activity of clear-cut logging to the stands that have reached the harvest age. After that, the land-use type still remains as forest land, whereas the stand age will be reset by plantation or natural expansion of forest; the dominant tree species may be changed | HL |
Regeneration logging | Forest land | Forest land | < harvest age | – | – | A forest management activity of regeneration logging to the stands that have not reached the harvest age, in order to restore or enhance the ecological functions of forests. After that, the land-use type still remains as forest land, whereas the stand age will be reset by plantation or natural expansion of forest; the dominant tree species may be changed | RL |