1. Inst. of Soil and Water Resources and Environmental Science, Zhejiang Univ.; Hangzhou 310029 China
2. Zhejiang Provincial Key Lab. of Subtropical Soil and Plant Nutrition; Hangzhou 310029 China
3. Dep. of Environmental Sciences; Univ. of California; Riverside CA 92521
4. USDA-ARS; Salinity Lab.; Riverside CA 92507
5. Inst. of Soil Science; Chinese Academy of Sciences; State Key Lab. of Soil & Sustainable Agriculture; Nanjing 210008 China
6. Inst. of Nuclear-Agricultural Science, Zhejiang Univ.; Hangzhou 310029 China