scholarly journals Analysis of the Characteristics of Ecological Security Zoning and Its Dynamic Change Pattern: A Case Study of the Weibei Area

2020 ◽  
Vol 12 (17) ◽  
pp. 7222
Author(s):  
Yue Zhang ◽  
Liyuan Zhang ◽  
Kanhua Yu ◽  
Yifan Zou
Keyword(s):  
Dynamic Change ◽  
Principal Component ◽  
Ecological Security ◽  
Security Assessment ◽  
Climate Data ◽  
Buffer Region ◽  
Security Index ◽  
Index Value ◽  
High Level

The development pattern of agriculture and energy exploitation in the southern marginal area of the Loess Plateau is widespread in the northern part of China. As a typical example, the fragile ecological area in the Weibei region is greatly affected by human factors, which makes the local ecological environment and social sustainability disturbed to varying degrees. Taking the Weibei region as the study area, through the comprehensive analysis of social, economic, and climate data, an index system suitable for the ecological security assessment of the Weibei region was constructed. The ecological security of this region was quantitatively evaluated by spatial principal component analysis (SPCA), and its ecological security partition was divided and analyzed. There were five zones at different levels, and I to V represented the development of ecological security from a low level to a high level. The results showed that from 1997 to 2017, the ecological security of different districts and counties in the Weibei region showed different trends. For example, the ecological security index of Tongguan County, Chengcheng County, and Pucheng County continued to decrease, but the overall index value was still high, and the ecological security index of Dali County, Fuping County, and Hancheng County increased. During this period, the ecological security of regions I and II continued to increase, while regions IV and V first decreased and then increased. At the same time, the area of the ecological security buffer region increased year by year. This study can provide a feasible method for assessing ecological security of the current regional model of mixed agriculture and energy extraction industry.

scholarly journals Environmental efficiency measurement based on DEA Malmquist model: a case study of Henan Province

2021 ◽  
Vol 248 ◽  
pp. 01030
Author(s):  
Zijing Zhang
Keyword(s):  
Panel Data ◽  
Technical Efficiency ◽  
Technological Progress ◽  
Dynamic Change ◽  
Malmquist Index ◽  
Henan Province ◽  
Environmental Efficiency ◽  
Index Model ◽  
High Level

Based on the panel data of different cities in Henan Province from 2010 to 2016, DEA model with variable scale compensation and Malmquist index model are used to measure environmental efficiency from static and dynamic perspectives. The results show that the overall environmental efficiency of Henan Province is at a high level, the technical efficiency is slightly improved, the allocation of input factors tends to be reasonable; the environmental efficiency is rising in dynamic change, among which the influence of technological progress on the environmental efficiency of Henan Province is more critical.

Ecological security assessment for environmental restoration and management in SW China

2020 ◽  
Author(s):  
xiaoyong Bai ◽  
huan Chen
Keyword(s):  
Environmental Management ◽  
Clustering Algorithm ◽  
Safety Evaluation ◽  
Principal Component ◽  
Vegetation Coverage ◽  
Ecological Security ◽  
Security Assessment ◽  
Single Method ◽  
Regional Ecological Security ◽  
Basic Prerequisite

<p>Regional ecological security diagnosis is the most basic prerequisite for environmental management and restoration. However, the traditional single method is greatly affected by human and difficult to quickly identify. Thus, This paper combined principal component analysis and unsupervised k-means clustering algorithm to provide a fast and efficient method for  safety evaluation of environmental management. Basing on this method, the clustering result was defined as five different levels of ecological safety zone combining with the principle of place name + landform + danger degree. The results showed that there were more than half of the study area were unsafe (56.3%), what was even more surprising was that there were many high-value of NDVI and NPP in these areas. The partition result was finally verified in order to ensure the accuracy of the partition, and it had been proved that the ecological environment is not necessarily safe where in the areas with good vegetation coverage. This article provided a new technical reference for the evaluation of ecological areas.</p>

scholarly journals Potential daylight resources between tropical and temperate cities – a case study of Ho Chi Minh City and Moscow

2018 ◽  
Vol 193 ◽  
pp. 04013 ◽  
Author(s):  
Nguyen Phuong Khanh Thi ◽  
Aleksei Solovyov
Keyword(s):  
Ho Chi Minh City ◽  
The Sun ◽  
Light Climate ◽  
Climate Data ◽  
Important Indicator ◽  
Luminous Efficacy ◽  
Latitudinal Difference ◽  
Modern Level ◽  
High Level

Horizontal illuminance is an important indicator, which shows the resources of the light climate of each region. Meticulous consideration of the light-climate data allows us to develop graphs of diffuse and global illuminance (ED and EG) and go to the territorial norms of daylight spaces at the modern level. Measurements of horizontal illuminance in Vietnam are not available; therefore, the calculation of the determination horizontal illuminance from solar radiation by light equivalents using the values of the luminous efficacy is widely used now. The paper contains calculation of the luminous efficacy for Vietnam, the results are graphs of horizontal illuminance for Ho Chi Minh. Comparative analysis with horizontal natural illuminance of Moscow shows a high level and uniform distribution of outdoor illuminance in the tropical sky in Vietnam. The maximum values of ED and EG for Ho Chi Minh City are 42.01 Klux and 87.17 Klux; for Moscow these values are equal to 28.3 Klux and 53.1 Klux, respectively. In addition, the levels of illuminance in the winter months in Ho Chi Minh are much higher than in Moscow, which is explained by the latitudinal difference in the location of these cities and the corresponding movement of the Sun.

scholarly journals The Effect of Urban-Suburban Interaction on Urbanization and Suburban Ecological Security: A Case Study of Suburban Wuhan, Central China

2020 ◽  
Vol 12 (4) ◽  
pp. 1600 ◽  
Author(s):  
Yasi Tian ◽  
Lei Wang
Keyword(s):  
Urban Expansion ◽  
Central China ◽  
Ecological Security ◽  
Security Assessment ◽  
Land Use Optimization ◽  
Ecological Protection ◽  
Rapid Pace ◽  
Basic Characteristics ◽  
The Relationship

In developing countries like China, urbanization is still occurring at a rapid pace. During urbanization, the urban land expands drastically, which makes suburbs the most affected area facing urban expansion. The land transition has proven to threaten the function and security of ecosystems, and therefore the topics of suburban land transition and ecological security have raised much attention. However, the urban-suburban interaction, which is one of the basic characteristics of suburbs, has been insufficiently considered. The urban-suburban interaction is developed based on the flows of people, materials, and information between urban and suburban areas, and it essentially reveals the relationship between human activities and land-use optimization. To fill the research gap, this study adopts a case study of Wuhan city, and first quantifies the urban-suburban interactions from a symbiotic perspective, and investigates rural residents and public buses to verify the estimated interactions. The results show that there is obvious heterogeneity in urban-suburban interactions in different suburban towns. Correlation analysis and geographic weight regression are then applied to demonstrate the relationship between the urban-suburban interaction and urbanization in the suburbs. Additionally, urbanization potential in the suburbs is estimated. Then, a suburban ecological security assessment is conducted by a “pressure-status-response” (PSR) model, and the urbanization potential that is estimated based on urban-suburban interaction is integrated as a “pressure” indicator. The comparison between the suburban ecological security assessment results based on considering and not considering urban-suburban interaction demonstrates the importance of considering urban-suburban interaction. This study contributes to the understanding of the complicated relationships of urban-suburban socio-economic, spatial, and ecological environments, and offers suggestions for suburban planning and ecological protection.

Sign in / Sign up

Export Citation Format

Share Document