Assessment of landscape ecological risk and its dynamic response with urbanization development of Jiangsu Province

MA Yingyi, LIU Zhifeng

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (5) : 185-194.

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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (5) : 185-194. DOI: 10.12302/j.issn.1000-2006.202008049

Assessment of landscape ecological risk and its dynamic response with urbanization development of Jiangsu Province

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Abstract

【Objective】 This paper assessed landscape ecological risk and explored the response with urbanization, aiming to provide the basis for Jiangsu’s scientific regulation and control of high-level ecological environment protection and high-quality development of urbanization. 【Method】 Using remote sensing image data of Landsat TM of 2010 and Landsat OLI of 2018, and with help of ENVI 5.3 and ArcGIS 10.2, we analyzed changes in landscape pattern through landscape pattern indices, made comprehensive assessment of landscape ecological risk and probes into hierarchical structure and its characters, and made quantitative measurement of response type and dependency relationship between increment of both landscape ecological risk and urbanization. 【Result】 Jiangsu’s main landscape types included cultivated land, built-up land and water, with cultivated land as base landscape. In the evolution of landscape pattern, cultivated land’s heterogeneity increases, built-up land was mainly used for external expansion, and water basically remained the same. Landscape ecological risk increased significantly, and average value raised from 0.123 6 to 0.149 9. The TOP 3 cities of current landscape ecological risk were Suzhou, Wuxi and Changzhou, and the high risk area was located in southern Jiangsu while the low risk area lied in northern Jiangsu. The value of landscape ecological risk increased gradually from northern Jiangsu to southern Jiangsu with the passage of time. There were distinctive characters of agglomeration distribution situation and economic development tendency. Coupling degrees of incremental landscape ecological risk and incremental urbanization level were greater than 0.8. Built-up urban land expansion came up with a great contribution rate to increment of landscape ecological risk. And the correlation coefficient reached 0.83. 【Conclusion】 Jiangsu’s landscape pattern changed significantly. Landscape ecological risk and urbanization level displayed the response pattern of homodromous ascending and their increments were high coupling. Dynamic response types contained low-sensitive region of Xuzhou, Suqian, Huai’an and Yancheng in northern Jiangsu and Yangzhou, mid-sensitive region of area along the Yangtze River and Lianyungang, high-sensitive region of Suzhou and Wuxi. Land urbanization of “spreading out the pies” type developed rapidly in five cities of southern Jiangsu and Nantong City. Southern Jiangsu area of high-level economic development was with high landscape ecological risk. Land urbanization would accelerate ecological environment degradation, while population urbanization could slow down the deterioration rate, and economic restructuring made less disturbance.

Key words

landscape ecological risk / landscape pattern / urbanization / dynamic response / Jiangsu Province

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MA Yingyi , LIU Zhifeng. Assessment of landscape ecological risk and its dynamic response with urbanization development of Jiangsu Province[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2021, 45(5): 185-194 https://doi.org/10.12302/j.issn.1000-2006.202008049

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Using data for Chongqing Municipality, China, we conducted a coupling analysis of key indexes to accomplish the following objectives. We aimed to identify a coupling mechanism for the bearing capacity of the ecological environment (BCEE) and the quality of new urbanization based on an examination of the degree of their coupling in Chongqing during the period 2000-2012. We further aimed to evaluate the level of regional coupling and to determine the stage of urbanization at which an optimal outcome could be achieved to ensure sustainable urbanization within the region. Applying an analytic hierarchy process (AHP), we assessed the main indicators of BCEE and the quality of new urbanization in Chongqing. Accordingly, we constructed a model of ecological environment coupling coordination for analyzing the degree of regional coupling between the ecological environment and urbanization quality for evaluating the BCEE of Chongqing's cities and towns in 2000-2012. We obtained the following results for the study period. First, the overall degree of regional coupling of the quality of new urbanization and the BCEE was between 0.967 and 1.000, implying an advanced stage of coupling. Second, the coupling degree ranged between 0.884 and 1.000 in all of the districts and counties of Chongqing, implying a further advanced stage of coupling with a distinct spatial pattern of "one circle and two wings." Third, the coupling degree for all districts and counties matched that of the overall degree of regional coupling, barring obvious spatial variation, especially in relation to BCEE indicators. All of the districts and counties were classified into four types according to the degree of coupling between new urbanization quality and the BCEE. The findings indicate that rapid urbanization has led to increased ecological pressure within the Chongqing metropolitan area because of a concentration of the population within the central city. Moreover, with the fast pace of development in central city districts, their BCEE differs from that of other districts and counties. This will create a pattern of primary urbanization that can lead to an unsustainable situation in the near future. Local governments should, therefore, modify present urban development patterns accordingly. Optimization of resources utilization as well as adjustments in industrial distribution and industrial upgrading are recommended as effective measures that can disperse the population and reduce the pressure exerted by urbanization on the ecological environment.

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城镇化与生态环境耦合系统是人地关系地域系统的重要一环,面对新时代全球尺度的远程联系、时空压缩与社会经济重构,传统的研究框架急需转型和升级。借鉴人地关系地域系统、远程耦合和星球城市化等理论,从复杂性科学视角出发,首先解析了城镇化与生态环境耦合系统的内涵,进而从空间、时间、表象和组织四个维度,提出了一个解释城镇化与生态环境耦合机理的分析框架——“耦合魔方(CHNC)”,并论述了其概念、内涵、演化规律和分析框架:魔方中的系统与系统、系统与要素、要素与要素间通过各种“耦合线”相互联系与作用,形成一个彼此嵌套、相互联系、对立统一的有机整体;魔方的旋转代表了不同地域间城镇化与生态环境的时空非线性耦合作用,系统通过不断能量交换,产生临界相变与整体涌现性,长期处于有序与无序之间的中间状态;“耦合魔方”包括近远程耦合、近远期耦合、组内间耦合和显隐性耦合,共四个维度,八种类型。重点剖析了远程、远期、组间和隐性耦合的科学内涵、研究方法与典型案例,并形成更具普遍意义的人地关系耦合矩阵。“耦合魔方”为揭示城镇化与生态环境耦合系统的演化和机理提供一个更加全面系统的跨学科研究范式,拓展了人地系统耦合研究的分析维度,为面向人类福祉的区域可持续发展政策制定提供科学支撑。
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Abstract
研究基于出口距离的基本定义及衍生的出口偏移指数(IMEO),探讨了2005—2016年中国317个市域单元的货物出口格局演化。同时,以一般公共预算支出、规模以上工业总产值、互联网宽带用户数表征财政投入、工业水平、通信技术,利用时空地理加权回归模型(GTWR)分析了其对于地区货物出口的影响。研究得出以下结论:① 2005—2016年IMEO呈现正余弦叠加振荡,外贸货物出口格局的演化态势为:重心西移→重心东移→重心西移→重心东移,表明西部地区的货物出口贸易受经济转型和国际环境的冲击更大;② 在对外贸货物出口的整体影响上,财政投入>工业水平>通信技术。政府财政投入对货物出口贸易的影响已经式微,通信技术发展对西部外贸货物出口的促进作用较东南部更为显著。研究认为未来东部应当加大高新技术产品的出口,增加对贸易风险的管控。西部则应加大基础设施建设,提升工业生产能力。
LI E K, LU Y Q, CHEN Y. Geographic pattern evolution of China’s merchandise export and its influencing factors:based on the analysis of merchandise export distance and the GTWR model[J]. Geogr Res, 2019, 38(11):2624-2638.DOI: 10.11821/dlyj020181007.

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