1. Department of Soil and Crop Sciences, Colorado State University , Fort Collins, CO 80523 , United States
2. Rocky Mountain Research Station, US Forest Service , Fort Collins, CO 80526 , United States
3. Division of Biological Sciences, Pacific Northwest National Laboratory , Richland, WA 99354 , United States
4. Department of Microbiology and Plant Pathology, University of California Riverside , Riverside, CA 92521 , United States
5. Department of Chemistry, Colorado State University , Fort Collins, CO 80523 , United States
6. The Environmental Studies Program, Colorado College , Colorado Springs, CO 80946 , United States
7. Department of Civil and Environmental Engineering, Colorado State University , Fort Collins, CO 80523 , United States