1. Department of Soil and Water Conservation; National Pingtung University of Science and Technology; Pingtung 912-01 Taiwan
2. National Soil Resources Institute; Cranfield University; Cranfield MK43 0AL UK
3. Department of Geography; National Changhua University of Education; Changhua 500 Taiwan
4. Institute of Physics; Academia Sinica; Taipei 115-29 Taiwan
5. Biodiversity Research Center; Academia Sinica; Taipei 115-29 Taiwan