Spatial-temporal differentiation characteristics of county-level urban ecosystem services value：A case study of Qianjiang city in Hubei province
LIU Yuan, REN Yi, ZHOU Yong, LI Xi-gui
HUBEI AGRICULTURAL SCIENCES . 2019, (5): 47 -53 .  DOI: 10.14088/j.cnki.issn0439-8114.2019.05.011