|
Author(s): |
Yuan Zhao, College of Geographic Science, Nanjing Normal University, Nanjing, China
Hailing Niu, College of Geographic Science, Nanjing Normal University, Nanjing, China
Zuying Yang, College of Geographic Science, Nanjing Normal University, Nanjing, China |
|
Abstract: |
This paper takes China crude oil flow as the research subjects, and takes Provincial-level administrative units as the nodes of crude oil flow. At first, selecting five typical time points from 1985 to 2007, this paper divides the provinces in which the oil flow exists into four oil balancing types: basic self-sufficiency, half self-sufficiency, net payout and net supply. Meanwhile, this paper divides the provinces into three flow function regions: source region, collection region and complex region. Then this paper analyzes the five time points and reveals the evolution characteristics of the spatial structure of crude oil flow source-collection system. (1)The quantity of source region of crude oil flow is on the decrease. And the spatial structure of source-region system appears like a right-angle triangle of one main body and two wings and the triangle’s form and range changes sharply from 1985 to 2007. Specifically, one main body is always Northeastern China; however, the two wings are subject to variation from Central and Eastern China in 1985, through Northwestern and Eastern China in 1995 and in 1999, then to Northwestern and Northern China in 2003 and in 2007. Besides, it is a continuous decline in the crude oil output scale of source-region system. (2)The quality of confluence region of crude oil flow is on the increase. And the spatial structure of collection-region system appears like a trapezium. Specifically, in 1985 and in 1995, it appeared like a east-west narrowed and north-south extended trapezium; in 1999 and in 2003, it appeared like a north-south narrowed and east-west extended trapezium; then in 2007, it also appeared like a south extended trapezium. Besides, it is a continuous increase in the crude oil input scale of confluence-region system. (3)The quality of complex region of crude oil flow is least. And the spatial structure of complex-region system changes largely, such as the forms of line, point, and triangle in different time points.
|