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Ezeonu, Ifeanyi; Ezeonu, F. C.

doi:10.1023/a:1006651927333

Cited by 47 publications

(14 citation statements)

References 2 publications

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“…In the middle of the twentieth century, concerns began to mount over problems caused by ecological degradation, and ecological security has become a common interest for many countries and organizations [1]. Ecological security, a concept first proposed by the United States government [2], has been linked with national security, economic security, and human well-being [3]. In addition, urban ecological security, a spatial concept, is the possibility of variation trends, guaranteed by a complex system of humans and the environment within an urban region, which prevents potential risks to the human ecological security space caused by natural and human activities or a combination thereof.…”

Section: Introductionmentioning

confidence: 99%

Development and Application of a New Grey Dynamic Hierarchy Analysis System (GDHAS) for Evaluating Urban Ecological Security

Shao

Tian²,

Guan

et al. 2013

IJERPH

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Selecting indicators based on the characteristics and development trends of a given study area is essential for building a framework for assessing urban ecological security. However, few studies have focused on how to select the representative indicators systematically, and quantitative research is lacking. We developed an innovative quantitative modeling approach called the grey dynamic hierarchy analytic system (GDHAS) for both the procedures of indicator selection and quantitative assessment of urban ecological security. Next, a systematic methodology based on the GDHAS is developed to assess urban ecological security comprehensively and dynamically. This assessment includes indicator selection, driving force-pressure-state-impact-response (DPSIR) framework building, and quantitative evaluation. We applied this systematic methodology to assess the urban ecological security of Tianjin, which is a typical coastal super megalopolis and the industry base in China. This case study highlights the key features of our approach. First, 39 representative indicators are selected for the evaluation index system from 62 alternative ones available through the GDHAS. Second, the DPSIR framework is established based on the indicators selected, and the quantitative assessment of the eco-security of Tianjin is conducted. The results illustrate the following: urban ecological security of Tianjin in 2008 was in alert level but not very stable; the driving force and pressure subsystems were in good condition, but the eco-security levels of the remainder of the subsystems were relatively low; the pressure subsystem was the key to urban ecological security; and 10 indicators are defined as the key indicators for five subsystems. These results can be used as the basis for urban eco-environmental management.

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Section: Introductionmentioning

confidence: 99%

Development and Application of a New Grey Dynamic Hierarchy Analysis System (GDHAS) for Evaluating Urban Ecological Security

Shao

Tian²,

Guan

et al. 2013

IJERPH

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“…AHP is trying to find a solution that best suits the needs of the decision makers according to their understanding and attitude to the problem. Normally, the AHP includes five steps [12]: (1) decomposing the decision problem into a hierarchy of simpler sub-problems, usually a hierarchy of evaluation indices is established; (2) Building pair-wise comparison matrix in different levels to judge the importance of the elements by paired comparison using the scale method [1, 9]; (3) Determining the relative weight of one element to another through calculating the priority vector and maximum eigenvalue of the comparison matrix; (4) Examination the consistency of the pair-wise comparison matrix in different levels by calculating the consistency index ( CI ) for each level of the hierarchy structures; (5) Calculation the relative weight of the each element to the whole target and examination the consistency of the whole hierarchical matrix. Herein, the process of the weight determining has been programmed using Matlab Soft (Version 7.0).…”

Section: Study Area and Evaluation Methodsmentioning

confidence: 99%

“…For positive indices, data standardization is carried out according to formula (1), while it is carried out according to formula (2) for the negative indices. Through the standardization process, the standardized values are in the range of 0[1]. As the topmost index is 'Ecological Unsafety Index'.…”

Section: Study Area and Evaluation Methodsmentioning

confidence: 99%

“…The concept of ecological security has been widely considered after it was proposed by the government of the United States [1]. Generally, the broad-sense conception of ecological security includes the complex systems of natural, economic and social system, while the narrow-sense conception of ecological security focused on the natural and human influenced ecosystems [2, 3].…”

Section: Introductionmentioning

confidence: 99%

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Temporal variations of ecological security with soil and water loss stress in black soil region of northeast China: a case study on Baiquan County

et al. 2013

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The deterioration of ecological situation with serious soil and water loss in black soil region of northeast China has attracted more attention due to its significant role on food security of China. To investigate the temporal characteristics of ecological status in typical black soil areas, Baiquan County is selected. Based on the model of Press-Status-Response (P-S-R), indicators are established and the ecological security situations with soil and water loss of Baiquan County are evaluated for the years of 1979, 1990, 2000 and 2005. The results show that the ecological insecurity indicator changes from 0.701 to 0.435 from 1979 to 2005, with a decrease of 37.9% for Baiquan County. And the contributions of physical and human factors to the temporal variations of the ecological security are discussed in detail. Moreover, several problems are recognized to be the potential threats to the ecological security in Baiquan county, including reduction of the effective thickness, excessive application of the fertilizer and low efficiency of the agricultural irrigation system. It is found that effective soil and water loss control actions have made great contribution to the improvement of the ecological security in Baiquan county. All these results and discussions are very helpful for the further investigation on the quantitative relationship between soil and water loss and ecological security in black soil region of northeast China.

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“…Eco-security is defined as the "ecologically sustainable development that meets the environmental and ecological needs of the present generation without compromising the ability of future generations to meet their own environmental and ecological needs" [1,2], which was first introduced by the Insurance Accounting and Systems Association (IASA) in the global eco-security monitoring system of 1989 [3]. Land is a scarce resource at a global scale, and the space carrier of human activities, so it is fundamental in all human existence and development [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Land Eco-Security Assessment Based on the Multi-Dimensional Connection Cloud Model

Liu¹,

Wang²,

Wang³

et al. 2018

Sustainability

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Abstract:The evaluation of land eco-security is challenging because it is involved with various uncertainty factors. Although the normal cloud model provides an idea for dealing with the randomness and fuzziness of indicators for the evaluation of land eco-security, it cannot simulate the distribution state of the evaluation indicators in a finite interval and their calculation process is complicated for multi-factor problems. Herein, a novel multi-dimensional connection cloud model is discussed to remedy these defects. In this model, combined with the range of evaluation factors in each grade, the identity-discrepancy-contrary principle of set pair theory is adopted to determine the digital characteristics of the multi-dimensional cloud model, which can uniformly describe the certainty and uncertainty relationships between the measured indices and the evaluation criteria and also improve the fuzzy-randomness of evaluation indicators closer to the actual distribution characteristics. The case study and the comparison of the proposed model with the normal cloud model and the matter element model were performed to confirm the validity and reliability of the proposed model. Results show that this model can overcome the subjectivity in determining the digital characteristics of the normal cloud model, providing a novel method for the comprehensive evaluation of land eco-security.

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Cited by 47 publications

References 2 publications

Development and Application of a New Grey Dynamic Hierarchy Analysis System (GDHAS) for Evaluating Urban Ecological Security

Development and Application of a New Grey Dynamic Hierarchy Analysis System (GDHAS) for Evaluating Urban Ecological Security

Temporal variations of ecological security with soil and water loss stress in black soil region of northeast China: a case study on Baiquan County

Land Eco-Security Assessment Based on the Multi-Dimensional Connection Cloud Model

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