经济发达地区大城市城乡系统耦合程度随着国家经济社会转型而不断变化,测度城乡系统耦合(以耦合度表示)旨在揭示不同时期城乡相互作用和影响程度,从而为进一步调控城乡互动关系提供科学依据。本文以无锡市为案例,以系统科学理论为基础,构建城乡系统耦合测度模型,对无锡市1979至2008年8个时期的城乡系统耦合程度进行测度,并分析耦合度变化原因和规律。结果表明:无锡市城乡系统耦合度变化过程明显分为三个阶段,呈现拉平"S"型。在1990s初期以前耦合度较低,反映城乡系统较为独立发展;1990s初期以后耦合度快速提高,城乡互动关系加强;进入21世纪耦合度缓慢上升趋于停滞,城市系统在持续加速发展的同时,乡村系统发展趋缓并呈下降趋势。伴随乡村系统发展速度的下降,城乡系统潜伏着二者不协调的危机,为保证其可持续发展,国家公共政策需要加强对乡村发展的扶持和引导,以促进城乡系统良性互动。

The coupling degree of metropolitan urban and rural system in developed areas changes along with national economic and social transformation. It aims at revealing the interaction and impact between urban and rural area of different period to test the coupling of urban and rural system which is expressed by coupling degree. The coupling degree can also provide a scientific basis for the further regulation of interaction between urban and rural areas. Based on the theory of systematic science, this paper took Wuxi as an example to construct a coupling measurement model of urban and rural system. It measured the coupling degree of urban and rural system in Wuxi of 8 periods which is from 1979 to 2008 on the base of coupling degree measure system, and described the track of development of urban and rural system according to the coupling degree of Wuxi. The measure results shows that:from 1979 to 2008, the changing progress of the coupling degree in Wuxi urban and rural system can be divided into three stages, which presented as a shape of flattening "S". Before the early 1990s, the coupling degree keeps a low increase trend which reflects a more independent development of urban and rural systems; after the early 1990s, the coupling degree increases rapidly which reflects that the interaction between urban and rural areas is strengthened; in the 21st century, the coupling degree tends to keep a slow rising. As the development of the urban system is accelerated continuously, the development of the rural system is declining and even slowing down. Along with the slowing down of the development of rural system, there is a crisis of in compatibility between the urban and rural system. Aiming at the sustainable development of urban and rural system, the government needs to strengthen the support and guidance in public policies to rural development to promote the positive interaction between the urban and rural system.