1. Dep. of Plant and Environmental Sciences; Norwegian Univ. of Life Sciences; PO Box 5003 1432 Ås Norway
2. Dep. of International Environment and Development Studies, NORAGRIC; Norwegian Univ. of Life Sciences; PO Box 5003 1432 Ås Norway
3. Carbon Management and Sequestration Ctr; Ohio State Univ.; Columbus OH 43210
4. Dep. of Biological and Environmental Sciences; School of Science, Kathmandu Univ.; Dhulikhel Nepal