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Modern forestry focusing on ecological dimension needs some new indicators different from those designed for the traditional forestry. On the basis of the evaluation indicators for traditional forestry, such as forest coverage, total standing stock volume and forest volume per unit area, the paper came up with a new indicator called “forest thickness” (FT). FT refers to the thickness which can be got if using total stock volume of forest and trees to cover the total land in a given area, and it is charged by mm. This indicator can be used to solve the long-term problem that the forest coverage can not reflect in a comprehensive way the level of forest ecological development, and provide the easy and clear approach to measuring and comparing the levels of forest ecological development in different periods at different regions. When the indicator value is over 9 mm, the ecosystem is indicated as excellent; when in 6-9 mm, the ecosystem is indicated as good; when in 3-6 mm, the ecosystem is indicated as moderately good; when below 3 mm, the ecosystem is indicated as bad. The indicator values of FT are calculated for the world, 17 countries, and different historic periods and different regions of China, based on which the forestry ecological status in these areas are compared and evaluated.
Modern forestry focusing on ecological dimension needs some new indicators different from those designed for the traditional forestry. On the basis of the evaluation indicators for traditional forestry, such as forest coverage, total standing stock volume and forest volume per unit area, the paper came up with a new indicator called “forest thickness ” (FT). FT refers to the thickness which can be got if using total stock volume of forest and trees to cover the total land in a given area, and it is charged by mm. This indicator can be used to solve the long-term problem that the forest coverage can not reflect a comprehensive way the level of forest ecological development, and provide the easy and clear approach to measuring and comparing the levels of forest ecological development in different periods when the indicator value is over 9 mm, the ecosystem is indicated as excellent; when in 6-9 mm, the ecosystem is indicated as good; when in 3-6 mm, the ecosystem When is below 3 mm, the ecosystem is indicated as bad. The indicator values of FT are calculated for the world, 17 countries, and different historic periods and different regions of China, based on which the forestry ecological status in these areas are compared and evaluated.