scholarly journals Evaluation of Resource and Environmental Carrying Capacity of China’s Rapid-Urbanization Areas—A Case Study of Xinbei District, Changzhou

Land ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 69 ◽  
Author(s):  
Kaiyuan Li ◽  
Xiaolong Jin ◽  
Danxun Ma ◽  
Penghui Jiang
Keyword(s):  
Carrying Capacity ◽  
Urban Areas ◽  
Assessment Model ◽  
Current Status ◽  
Land Resource ◽  
Estimation Model ◽  
Mountain Areas ◽  
Rapid Urbanization ◽  
Environmental Carrying Capacity ◽  
Resource Characteristics

The evaluation of resource and environmental carrying capacity (RECC) is the foundation for the rationale behind the arrangement of land spaces for production, living, and ecological uses. In this study, based on various natural, economic, and social factors, an integrated Multi-Factor assessment model was developed to evaluate the RECC of Xinbei district of Changzhou. Meanwhile, we also calculated the population carrying capacity estimation model restricted by food security. The study comprehensively analyzed the current status and land resource characteristics of a rapid urbanization area and the RECC restrictions for protection and development. The results indicate that the comprehensive carrying capacity of Xinbei showed distinct spatial heterogeneity, with a decreasing trend from the riverside protection area to urban areas, then to mountain areas. Combined with the secure food supply provided by future land resources, it was estimated that the population carrying index of Xinbei would be as high as 1.25 and 1.22 in 2035 and 2050, respectively, indicating that both years would experience a population overload. Therefore, an urgent adjustment to the structure and layout of territorial space and resources of the Xinbei District is necessary.

Application of Cloud Theory and Set Pair Analysis Coupled Model for Evaluating Environmental Carrying Capacity in Tianjin

2014 ◽  
Vol 675-677 ◽  
pp. 377-381 ◽  
Author(s):  
Qi Si ◽  
Ming Chang Li
Keyword(s):  
Carrying Capacity ◽  
Coupled Model ◽  
Assessment Model ◽  
Set Pair Analysis ◽  
Membership Degree ◽  
Analysis Method ◽  
Environmental Carrying Capacity ◽  
Degree Function ◽  
Cloud Theory ◽  
Pair Analysis

Following the development of national economy, environmental pollution and ecological hazards has been resulted from the pollutant discharge and reclamation etc. So it is very important for evaluating the environmental carrying capacity for guiding the environmental management and control. In this paper, a systematic assessment model with detailed procedure for environmental carrying capacity is proposed, based on the combination of set pair analysis method and cloud theory. The membership degree function obtained from bell function in cloud theory is used for connection degree function in set pair analysis method. The normalization means of membership degree has advantageous of improving the reasonability of membership space. The calibration results of case study work well in Tianjin Binhai New District. This shows the coupled model has advantages of concision, easy-operation and high precision of set pair analysis method, and the randomness and ambiguity of assessment indexes’ membership can be reflected in the assessment procedure by using the cloud theory, so the assessment results are reliable and practical significance.

An evolving assessment model for environmental carrying capacity: A case study of coral reef islands

2019 ◽  
Vol 233 ◽  
pp. 543-552 ◽  
Author(s):  
Fei Cheng ◽  
Fenzhen Su ◽  
Ming Chen ◽  
Qi Wang ◽  
Huiping Jiang ◽  
...  
Keyword(s):  
Coral Reef ◽  
Carrying Capacity ◽  
Assessment Model ◽  
Environmental Carrying Capacity ◽  
Reef Islands

Urbanization and Changes in Cropping Patterns at Kathmandu Valley

2007 ◽  
Vol 7 ◽  
pp. 113 ◽  
Author(s):  
Raj Man Shrestha
Keyword(s):  
Urban Areas ◽  
Cropping System ◽  
Considerable Change ◽  
Rapid Expansion ◽  
Leafy Vegetables ◽  
Kathmandu Valley ◽  
Rapid Urbanization ◽  
Average Growth ◽  
Cropping Patterns ◽  
Agriculture Land

The increase of population in Kathmandu valley is bringing a considerable change in cropping system. Rapid urbanization and introduction of new agriculture technology have encouraged the valley’s farmers to change their cropping patterns from traditional (low value crops) to new crops (high value crops). According to numerous studies made in Nepal, the change is seen considerably in winter crops than in summer crops and the land under cultivation of green leafy vegetables is increasing rapidly in the urban and semi-urban areas. An average growth of population at 3 % in the valley during the period 1951-2001 has resulted in the rapid expansion of area under urban coverage (24.6 % growth per year from 1984 - 2000) has made agriculture land of Katmandu valley to decline per year by 2.04 % (836.27 ha per year). If this trend of decline in agriculture land in Kathmandu valley continues in future too, it is expected that there will be no agriculture land left over by two and half decades in the valley. The planners should take note of this fact that if fertile land of Katmandu valley is to be preserved for agriculture necessary planning is urgently needed. <i>Nepal Journal of Science and Technology</i> Vol. 7, 2006

Grassland resource evaluation based on improved bp network model and analytic hierarchy process

2020 ◽  
pp. 1-12
Author(s):  
Zhou Jiang ◽  
Zhenwu Wei
Keyword(s):  
Sustainable Development ◽  
Analytic Hierarchy Process ◽  
Carrying Capacity ◽  
Index System ◽  
Evaluation Index System ◽  
Analytic Hierarchy ◽  
Bp Network ◽  
Resource Evaluation ◽  
Environmental Carrying Capacity ◽  
Hierarchy Process

Grassland resources are an important part of land resources. Moreover, it has the functions of regulating the climate, windproof and sand fixation, conserving water sources, maintaining water and soil, raising livestock, providing food, purifying the air, and beautifying the environment in terrestrial ecosystems. Grassland resource evaluation is of great significance to the sustainable development of grassland resources. Therefore, this paper improves the BP neural network, uses the comprehensive index method to calculate the weights in the analytic hierarchy process, and constructs a water resources carrying capacity research and analysis system based on the entropy weight extension decision theory. Meanwhile, this paper analyzes different levels of resource and environmental carrying capacity to achieve the purpose of comprehensive evaluation of resource and environmental carrying capacity. In addition, based on the theory of sustainable development, under the guidance of the principle of index system construction, this paper studies the actual situation of grassland resources and the availability and operability of data, and combines with the opinions given by experts to form an evaluation index system of grassland resources and environmental carrying capacity. Finally, through the actual case study analysis, it is concluded that the model constructed in this paper has a certain effect.

scholarly journals Where Do I Allocate My Urban Allotment Gardens? Development of a Site Selection Tool for Three Cities in Benin

Land ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 318
Author(s):  
B. G. J. S. Sonneveld ◽  
M. D. Houessou ◽  
G. J. M. van den Boom ◽  
A. Aoudji
Keyword(s):  
Food Insecurity ◽  
Urban Agriculture ◽  
Low Income ◽  
Urban Areas ◽  
Urban Poor ◽  
Site Suitability ◽  
Rapid Urbanization ◽  
Middle Income ◽  
Support Tool ◽  
Allotment Gardens

In the context of rapid urbanization, poorer residents in cities across low- and middle-income countries increasingly experience food and nutrition deficiencies. The United Nations has highlighted urban agriculture (UA) as a viable solution to food insecurity, by empowering the urban poor to produce their own fresh foods and make some profit from surplus production. Despite its potential role in reducing poverty and food insecurity, there appears to be little political will to support urban agriculture. This is seen in unclear political mandates that are sustained by information gaps on selection criteria for UA sites. The research reported here addresses this issue in the form of a decision-making support tool that assesses the suitability of cadastral units and informal plots for allotment gardens in urban and peri-urban areas. The tool was developed and tested for three rapidly expanding cities in Benin, a low-income country in West Africa, based on an ordered logit model that relates a set of 300 expert assessments on site suitability to georeferenced information on biophysical and socio-economic characteristics. Soil, land use, groundwater depth, vicinity to market and women’s safety were significant factors in the assessment. Scaled up across all cadastral units and informal sites, the tool generated detailed baseline maps on site suitability and availability of areas. Its capacity to support policymakers in selecting appropriate sites comes to the fore by reporting changes in site suitability under scenarios of improved soil fertility and enhanced safety for women.

scholarly journals Carrying capacity for ecotourism development in Tahura K.G.P.A.A. Mangkunagoro I

2018 ◽  
Vol 73 ◽  
pp. 02007
Author(s):  
Ari Wulandari ◽  
Maryono Maryono ◽  
Agus Setyawan
Keyword(s):  
Carrying Capacity ◽  
Negative Impact ◽  
Environmental Conservation ◽  
Conservation Areas ◽  
Nature Tourism ◽  
Mass Tourism ◽  
Environmental Carrying Capacity

The development of nature tourism in conservation areas such as in Taman Hutan Raya (Tahura) should be able to minimize the negative impact for the ecosystem. Tourism activities on the utilization block of Tahura must be limited by applying ecotourism concept which is concerned with environmental conservation and not the concept of mass tourism that is oriented on the number of visitors. Tahura K.G.P.A.A. Mangkunagoro I, every year has increased the number of tourist arrivals, most occur in 2016 and 2017 that is equal to 62.8% and 63.5%. This condition harmful the environment if it is not managed in a sustainable way that considers the carrying capacity of its environment. Therefore, a study was conducted to calculate the environmental carrying capacity in the utilization blocks of Tahura K.G.P.A.A. Mangkunagoro I using the method of calculating the physical carrying capacity (PCC), real carrying capacity (RCC) and effective carrying capacity (ECC) with the formula developed by Cifuentes (1992). The results of the calculation of environmental carrying capacity can be used as recommendation of the types of tourist activities that can be done, the arrangement of tourist visits, the type of facility that can be built in accordance with the rules of conservation and the number of officers required.

scholarly journals Evidence for Range Expansion and Origins of an Invasive Hornet Vespa bicolor (Hymenoptera, Vespidae) in Taiwan, with Notes on Its Natural Status

Insects ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 320
Author(s):  
Sheng-Shan Lu ◽  
Junichi Takahashi ◽  
Wen-Chi Yeh ◽  
Ming-Lun Lu ◽  
Jing-Yi Huang ◽  
...  
Keyword(s):  
Range Expansion ◽  
Ecological Niche Modeling ◽  
Phylogenetic Analyses ◽  
Current Status ◽  
Mountain Areas ◽  
Colony Losses ◽  
Short Branch ◽  
Branch Lengths ◽  
The Government ◽  
Central Taiwan

The invasive alien species (IAS) Vespa bicolor is the first reported hornet that has established in Taiwan and is concerning as they prey on honeybee Apis mellifera, which leads to colony losses and public concerns. Thus, the aim of this study was to assess the current status of V. bicolor abundance, dispersal, and impact and to trace the origins of Taiwan’s V. bicolor population. Our studies took place in five areas in northern to central Taiwan. We used mtDNA in the phylogenetic analyses. Field survey and ecological niche modeling (ENM) were used to understand the origins and current range of the invasive species. Two main subgroups of V. bicolor in the phylogenetic tree were found, and a clade with short branch lengths in Southeastern China and Taiwan formed a subgroup, which shows that the Taiwan population may have invaded from a single event. Evidence shows that V. bicolor is not a severe pest to honeybees in the study area; however, using ENM, we predict the rapid dispersion of this species to the cooler and hilly mountain areas of Taiwan. The management of V. bicolor should also involve considering it a local pest to reduce loss by beekeepers and public fear in Taiwan. Our findings highlight how the government, beekeepers, and researchers alike should be aware of the implications of V. bicolor’s rapid range expansion in Taiwan, or in other countries.

scholarly journals Assessment on Global Urban Photovoltaic Carrying Capacity and Adjustment of Photovoltaic Spatial Planning

2021 ◽  
Vol 13 (6) ◽  
pp. 3149
Author(s):  
Siyuan Chen ◽  
Yukun Zhang ◽  
Jie Zheng
Keyword(s):  
Carrying Capacity ◽  
Urban Areas ◽  
Spatial Planning ◽  
Influence Factors ◽  
Equilibrium Analysis ◽  
Solar Pv ◽  
Large Cities ◽  
Effective Combination ◽  
High Efficient ◽  
Sample Country

To promote the effective combination of photovoltaic (PV) utilization and urban development, this study proposes that solar PV generation should be taken as an important resource and environmental carrying capacity factor, which is defined as “Photovoltaic Carrying Capacity (PVCC)”, to be integrated into future urban planning. According to the PVCC assessment on global cities, the sensitivity of PVCC to different influence factors is analyzed and the benefits of different optimization strategies on PVCC are also discussed. Additionally, in an equilibrium analysis of PVCC distribution in six sample countries, we discuss both the causes and impact of their distribution gap. That analysis shows that the average PVCC in global urban areas can reach 23.13%, which approaches the anticipated needs of PV development in cities by 2050.Though different optimization strategies may be feasible to promote urban PVCC, they might only make significant changes in medium or large cities. When considering the high-efficient utility of local energy, dispersed layout of cities and population is necessary to implement PV spatial planning. According to the assessment and analysis results, the adjustment suggestions of PV spatial planning in each sample country are also discussed. Finally, it is pointed out that the proactive PV spatial may be of great significance to achieve higher solar energy supply and PVCC will be an available cognition in guiding this planning in the future.

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