1. Key Laboratory of Agro‐Environment in Downstream of Yangtze Plain, Ministry of Agriculture, Institute of Agricultural Resources and Environment Jiangsu Academy of Agricultural Sciences Nanjing 210014 China
2. Graduate School of Agriculture Hokkaido University Sapporo 060‐8589 Japan
3. Centre of Integrated Water‐Energy‐Food Studies, School of Animal, Rural and Environmental Sciences Nottingham Trent University, Brackenhurst Campus Nottinghamshire NG25 0QF UK
4. Graduate School of Agriculture and Biology Shanghai Jiao Tong University Shanghai 200240 China