The evolution and influencing factors of the temporal and spatial differences of county economy in less developed river basin：Taking the Lancang River Basin in Yunnan Province as an example

WU Yan, WU Ying-mei

HUBEI AGRICULTURAL SCIENCES . 2023, (6): 226 -232 . DOI: 10.14088/j.cnki.issn0439-8114.2023.06.040