title: [Identification of coupling relationship between urbanization and ecological environment in Jilin from entropy change perspective].
abstract: By using the entropy change equation of the second law of thermodynamics, entropy method and PSE model, this article made an analysis on coupling relationship between urbanization and ecological environment in Jilin Province from 2001 to 2011. In the study period, the urbanization development had been out of normal evolution track: The economic urbanization and space urbanization dominated the whole urbanization process, while population urbanization was neglected too seriously, with an apparent characteristic of extensive and inefficient input of resources (especially land resource). According to the levels of ecological environment on the basis of PSE model, not only the pressure index, sensitivity index and the elasticity index, but also the comprehensive index showed considerable growth with obvious stage characteristics: ascending-descending-ascending. The total entropy values of the urbanization were less than zero during the time, which meant an unstable rising curve. While the total trophy values of the ecological environment varied below and above zero, and 2003, 2006, 2010 and 2011 were the "turning points", reflecting the instability of the ecological environment. The coupling total entropy values between urbanization and ecological environment had the same characteristics with the ecological environment: the same "turning points" and shape of the curve, in which, the "turning points" corresponded to the type of antagonistic evolution pattern, while the rest of years responded to the type of coordination evolution pattern.
authors.forename: Ping-Jun
authors.initials: PJ
authors.lastname: Sun
authors.forename: Chun-Liang
authors.initials: CL
authors.lastname: Xiu
authors.forename: Tian-Jiao
authors.initials: TJ
authors.lastname: Zhang
mesh_terms: D002681:China; D017753:Ecosystem; D019277:Entropy; D014507:Urbanization