Terrestrial Condition Assessment
The Terrestrial Condition Assessment (TCA) is a landscape-scale assessment of ecological integrity across all National Forest System (NFS) lands.
- The TCA uses the Ecosystem Management Decision Support (EMDS) model to evaluate 12 indicators of ecological integrity, including air pollution.
- CLs are used for the Nitrogen Deposition metric associated with the Indicator: Air Pollution.
- You can view the completed assessments for your sites by using the links and guidance below.
Which CLs are included?
- Tree species growth and survival
- Lichen community composition
- Herbaceous species richness
- Aquatic acidification
- Mycorrhizal fungi
- Nitrate leaching
What are the sources of CL data? ⓘ
- Trees ⓘ
- Lichens ⓘ
- Herbs ⓘ
- Aquatic, mycorrhizal fungi, and nitrate leaching ⓘ
How is the scoring developed using CLs? ⓘ
Access the relevant websites and a step-by-step guide for using each website.
What is the Air Pollution Indicator for my Forest? | provides background information on the TCA and forest-level reports |
View the Data (Public) | provides the underlying data input, the output results at the indicator level, and the TCA thresholds |
View the Data (USFS Only) | provides which indicators are and metrics are driving ecological condition at the landscape level |