分类图_竖向时间轴_系统架构图分层_功能图_系统架构分层_层次分析法

upper layer

Total economic value of forest ecosystems

Existence value

Timber

 partial examples of c

Value for future gen-erations

Non-Use value

Use value

lower  layer

Value of existence

Direct use value

Water conser-vation

Guideline layer  B

Bequest value

Event Layer  C

Selection value

Target layer  A

Indirect use value

Future value of C1 or C2