Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China; Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, China. Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China. Department of Environmental and Biological Sciences, University of Eastern Finland, P. O. Box 1672, 70211 Kuopio, Finland. Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China. Electronic address: qian_tan@gdut.edu.cn. Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, United States. The Connecticut Agricultural Experiment Station, New Haven, CT 06504, United States.