1. Earth and Environmental Sciences Division; Los Alamos National Laboratory; Los Alamos; NM; 87545; USA
2. Department of Integrative Biology; University of California; Berkeley; CA; 94720; USA
3. Natural Resource Ecology Lab; Colorado State University; Fort Collins; CO; 80523; USA
4. Department of Geography; University of California; Santa Barbara; CA; 93106; USA
5. Biosystems Engineering and Soil Science Department; University of Tennessee; Knoxville; TN; 37996; USA
6. Department of Ecology, Evolution and Marine Biology; University of California; Santa Barbara; CA; 93106; USA