Study on the Coupling Development between Urbanization and Ecosystem-- The Comparative Analysis Based on Guizhou, Yunnan, Hunan and Zhejiang ProvinceLingyun Luo, Chenggang Li, Jue Hu, Bing Yang and Kang PanMATEC Web Conf., 100 (2017) 05030DOI: https://doi.org/10.1051/matecconf/201710005030