| 区域人口迁移时空溢出效应与动力机制分析 |
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| 引用本文： | 赵心怡,蒲英霞. 区域人口迁移时空溢出效应与动力机制分析[J]. 地球信息科学学报, 2018, 20(6): 817-826. DOI: 10.12082/dqxxkx.2018.180015 |
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| 作者姓名： | 赵心怡 蒲英霞 |
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| 作者单位： | 1. 南京大学地理与海洋科学学院,南京 2100232. 江苏省地理信息技术重点实验室,南京2100233. 江苏省地理信息资源开发与利用协同创新中心,南京 210023 |
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| 基金项目： | 国家自然科学基金项目（41271388、41771417）;江苏高校优势学科建设工程资助项目;江苏省地理信息资源开发与利用协同创新中心资助项目 |
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| 摘 要： | 区域人口迁移流的规模不仅取决于迁出地与目的地的“双边”要素,也与前期迁移流和周边迁移流息息相关。传统重力模型揭示了区域人口迁移过程的“推-拉”机制,但受制于对时空维度的忽视,无法有效表达迁移流之间的时空依赖关系,因而难以度量区域要素变化对迁移流产生的时空溢出效应。本文引入多种形式的时空依赖结构,构建迁移流时空重力模型,并采用贝叶斯马尔可夫链蒙特卡洛（MCMC）方法进行估计。在此基础上,结合时空效应框架量化区域要素对迁移流的影响,定量分析人口迁移过程的时空溢出效应与动力机制。本文以1985-2015年中国省际人口迁移为例,通过与非空间的动态重力模型估计结果比较,初步表明时间依赖、空间依赖以及时空扩散依赖在区域人口迁移过程中不容忽视;时空维度上,区域要素变化在初期对迁移网络的溢出效应超过对该区域迁移流的直接影响;逐渐衰减的时空溢出效应维持了区域人口迁移规模发展的相对稳定,与动态重力模型估计结果形成了鲜明对比。区域人口规模、人均GDP水平及其时空溢出效应共同驱动中国省际人口迁移系统的发展。耦合时空维度依赖关系的时空重力模型能更好地理解区域人口迁移过程的演化特征,为促进区域人口均衡发展提供科学的决策依据。
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| 关 键 词： | 区域人口迁移 时空重力模型 网络系统 时空溢出效应 中国 |
| 收稿时间： | 2018-01-02 |
Space-time Spillover Effects and Driving Forces of Regional Migration Process |
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| ZHAO Xinyi,PU Yingxia. Space-time Spillover Effects and Driving Forces of Regional Migration Process[J]. Geo-information Science, 2018, 20(6): 817-826. DOI: 10.12082/dqxxkx.2018.180015 |
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| Authors: | ZHAO Xinyi PU Yingxia |
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| Affiliation: | 1. School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China2. Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing 210023, China3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China |
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| Abstract: | Interregional migration is a significant component of regional population growth as well as a major driving force in urbanization process. The evolution of migration flows is not only related to the characteristics of origin and destination regions, but also the past and surrounding migration flows. Most empirical migration studies based on traditional gravity models have failed to capture space-time spillover effects during the migration process due to ignoring time or spatial dependence among migration flows. By introducing several space-time interaction effects, this paper constructed the space-time gravity model of interprovincial migration flows in China over the period of 1985-2015 and estimated the model using Bayesian Markov Chain Monte Carlo (MCMC) method. The space-time spillover effects evaluation framework further explained the space and time dynamics in the evolution of interprovincial migration associated with changes in regional GDP per capita and population size. The preliminary results are as follow: firstly, the estimates of time, spatial and space-time diffusion dependence are all significant, which can provide powerful means for exploring complex and systematic behaviors among regional migration flows. Secondly, regional population size dominates the Chinese interprovincial migration process more than twice the influence of regional GDP per capita. Thirdly, the spillover effects of regional socio-economic factors play a quite significant role during regional migration process, which are greater than the corresponding origin and destination effects in the short term. More importantly, the decaying spillover effects through the whole space-time network will help the migration system stay at an equilibrium state over the long term. All in all, the coupled space-time gravity model contributes to capture the space-time spillover effects and driving forces during the regional migration process, which provides a scientific basis for predicting future migration trends and promoting balanced regional population development. |
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| Keywords: | regional migration space-time gravity model network system space-time spillover effects China |
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