1. Institute of Urban Environment; Chinese Academy of Science; Xiamen 361021 China
2. Institute of Botany; The Czech Academy of Sciences; 25243 Pruhonice Czech Republic
3. Xiamen Botanical, Garden; Xiamen 361003 China
4. Faculty of Biological and Environmental Sciences; Ecosystems and Environment Research Programme; Univ. of Helsinki; FI-15140 Lahti Finland
5. Quanzhou Normal Univ; Quanzhou 362000 China
6. Dep. of Environmental Science and Engineering; Huaqiao Univ; Xiamen 361021 China