1 State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Shuangqing Road 18, Haidian District, Beijing, 100085, China. Electronic address: fzz@rcees.ac.cn.
2 IPSP-CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino, Florence, Italy.
3 US Forest Service, Pacific Southwest Research Station, 4955 Canyon Crest Drive, Riverside, CA, USA.
4 Centre for Ecology and Hydrology, Environment Centre Wales, Deiniol Road, Bangor, Gwynedd, LL57 2UW, UK.