Land Use

1. Sites deemed worthy by the IUCN for national parks or wildlife refuges
3. Forests free from disturbance for long enough to have mature trees.
5. Intensive planting of a single species.
11. Strips of natural habitat that connect two adjacent nature preserves.
15. Mature trees are removed from the forest in a series of two or more cuts, leaving younger trees and some mature trees
16. An open prairie or grassland with scattered groves of trees
18. Degrading a once fertile land and turning it to desert
19. A forest where tree crowns spread over 20 percent of the ground
20. A design for nature preserves that divides protected areas into zones

2. A combination of adventure, travel and nature appreciation
4. A change in species compostion, physical conditions, or other ecological factors at the boundary between two ecosystems
6. A habitat large enough to support a critical mass of species.
7. Harvesting trees in strips narrow enough to minimize edge effects and to allow natural regeneration of the forest
8. A proposal for maintaining essential ecological processes, preserving species
9. An integration of ecological, economic, and social goals in a unified system approach to resource management
10. Removing trees from a forest
12. Allowing livestock to eat so much plants that it degrades the biological community
13. Harvesting only mature trees of certain species and size
14. Confining grazing cattle in a small area for a short time, then rotating them to another area
17. Cutting every tree in a given area regardless of species or size