- Agriculture 21
- Monitoring/Environmental Analysis 11
- Soil Science & Conservation 11
- Landscape Ecology 10
- Sustainable Development 9
- Climate Change/Climate Change Impacts 7
- Landscape/Regional and Urban Planning 7
- Environmental Science and Engineering 6
- Hydrology/Water Resources 6
- Analytical Chemistry 5
- Environmental Geography 5
- Environmental Management 5
- Agricultural Economics 1
- Climate Change 1
- Engineering, general 1
- Geoecology/Natural Processes 1
- Geography, general 1
- Nature Conservation 1
- Oceanography 1
- Regional/Spatial Science 1