1. Key Lab. of Soil Environ. & Pollut. Rem.; Inst. of Soil Sci., Chinese Academy of Sci.; Nanjing 210008 China
2. Univ. of Chinese Academy of Sci.; Beijing 100049 China
3. Nanjing Inst. of Environ. Sci. State Environ. Protection Admin.; Nanjing 210042 China
4. Dep. of Exact Sciences ‘Luiz de Queiroz’; Agricultural College-ESALQ/USP; Piracicaba SP 13418-900 Brazil
5. Inst. of Soil, Water, & Environ. Sci. Agric. Res. Organization; Volcani Center; Rishon LeZion 7505101 Israel
6. Delaware Environ. Inst.; Dep. of Plant and Soil Sci.; Univ. of Delaware; Newark DE 19717