1. Department
of Ecosystem Science and Management, University of Wyoming, Laramie, Wyoming 82071, United States
2. Department
of Geological Sciences, University of Texas at El Paso, El Paso, Texas 79968, United States
3. Department
of Chemistry, Umeå University, Umeå SE-901 87, Sweden
4. Energy
Geosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
5. Canadian
Light Source, University of Saskatchewan, Saskatoon, Saskatchewan S7N 2V3, Canada
6. Key
Laboratory of Arable Land Conservation (Middle and Lower Reaches of
Yangtze River), Ministry of Agriculture, College of Resources and
Environment, Huazhong Agricultural University, Wuhan, Hubei 430070, People’s Republic of China