Integrating the MCR and DOI models to construct an ecological security network for the urban agglomeration around Poyang Lake, China

Dai, Lu; Liu, Yaobin; Luo, Xiaoling

doi:10.1016/j.scitotenv.2020.141868

Cited by 259 publications

(123 citation statements)

References 77 publications

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“…Besides, it was used in many fields such as urban growth boundaries and biodiversity protection. At present, scholars have adopted a wide range of research paradigms for optimizing the landscape pattern by identifying the source area, constructing the landscape cumulative resistance surface to find the path of least cost, and then extracting corridors and ecological nodes to optimize the landscape pattern [19,20]. Nevertheless, there are relatively few studies on landscape pattern construction and ecological restoration based on regional ecological security evaluation.…”

Section: Introductionmentioning

confidence: 99%

Research on Landscape Pattern Construction and Ecological Restoration of Jiuquan City Based on Ecological Security Evaluation

et al. 2021

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Jiuquan City is a typical ecologically fragile area in the arid areas of Northwest China, and unreasonable human activities directly affect the regional ecological security. Scientifically, it is necessary to construct an ecological landscape pattern on the basis of ecological security evaluation. This paper selected evaluation factors based on the perspective of “environmental base and human interference”, used spatial principal component analysis (SPCA) to comprehensively evaluate the regional landscape ecological security, and used the minimum cumulative resistance (MCR) model to construct the regional ecological security pattern. The results show that the overall ecological security level of the study area is low, and the area with a moderate safety level and below is 122,100 km2, accounting for 72.57% of the total area of the study area. The total area of the identified ecological source area is 6683 km2, the spatial distribution is extremely uneven, and it is extremely concentrated in the southern region; 32 ecological corridors with a total length of 3817.8 km are identified, of which corridor NO. 1–4 run through the Qilian Mountains, 11 oasis areas, and 14 nature reserves. The length of ecological corridors is 1376.1 km, accounting for 36.04% of the total. Forty-two ecological nodes are identified, and the central corridor area is more distributed; four ecological restoration zones are divided, including an ecological conservation zone, ecological improvement zone, ecological control zone, and ecological restoration zone, with areas of 34,380.3 km2, 61,884.4 km2, 21,134.4 km2, and 50,648.3 km2, respectively. Through the delineation of the urban ecological network pattern composed of source areas, corridors, and nodes, as well as the delineation of ecological restoration zones, the ecological security level of the study area will be effectively improved. Furthermore, a new method of ecological restoration zoning will be used, hoping to provide a useful reference for improving the quality of the ecological environment in arid areas and optimizing the spatial pattern of the land.

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Section: Introductionmentioning

confidence: 99%

Research on Landscape Pattern Construction and Ecological Restoration of Jiuquan City Based on Ecological Security Evaluation

et al. 2021

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“…Therefore, the urgent task for the Chinese government is to use more types of environmental regulation instruments, such as market-incentive policies and voluntary policies, to transform from a one fold, government-oriented environmental regime to a multi-fold, market-oriented environmental management regime. (3) Firms with different characteristics respond heterogeneously to the water quality regulations [41]. To make differential water quality regulations for firms from different industries, with different sizes and ownership structures, can improve the efficiency of water environmental regulations.…”

Section: Discussionmentioning

confidence: 99%

Can China’s Government-Oriented Environmental Regulation Reduce Water Pollution? Evidence from Water Pollution Intensive Firms

2020

Self Cite

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China’s environmental regulation regime remains mainly government-oriented, consisting of the government environmental investment policy and the command–control policy. This paper first improves the traditional environment Copeland-Taylor model by including the above two types of government-oriented environment instruments. Then, based on a comprehensive firm-level dataset, we examine the effects of government-oriented environmental instruments on firms’ water pollutant emission abatement in the Yangtze River Economic zone. We find robust evidence of a significant decrease of 2.99% in chemical Oxygen Demand(COD) discharge and of 3.55% in ammonia nitrogen(NH3) discharge of firms in response to the government environmental investment policy, whereas the command–control instrument shows little effect on firms’ water pollutant emission reduction. Our results are robust when using alternative measurements for two types of environmental instruments. Additionally, we also find there exist heterogeneous effects across sub-samples: (1)comparing with large and medium firms, small and micro firms are more liable to be influenced by the two types of government-oriented environmental instruments; (2) the effect of two types of government-oriented environmental instruments is obviously significant in the intensive-water-pollution industry, whereas it is not obvious in other industries; (3) the effect of government environmental investment is obvious on state-owned enterprises and domestic joint ventures, whereas the command–control policy has effectively reduced the water pollutant discharge for domestic joint ventures and private firms. Finally, this study also presents some future policy implications.

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“…For example, it has been used by Yang et al [ 26 ] to identify the ecological corridor of Wuhan City, China, with the aim to construct an ecological network of urban agglomeration. Similarly, Dai et al [ 41 ] combined the MCR model and the DOI (Duranton and Overman Index) to construct the ecological network of the Poyang Lake urban agglomeration in China.…”

Section: Introductionmentioning

confidence: 99%

Identifying Ecological Corridors and Networks in Mountainous Areas

Zhou

Song

2021

IJERPH

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Since the 1950s, human activities have been driving economic development and land changes, hindering the conservation of biological habitats and landscape connectivity. Constructing ecological networks is an effective means to avoid habitat destruction and fragmentation. Mountain areas are hotspots of biological habitats and biodiversity; however, the pace of urbanization in mountain areas is also accelerating. To protect an ecosystem more effectively, it is necessary to identify ecological corridors and ecological networks. Therefore, based on the Minimal Cumulative Resistance model and taking Chongqing in China as an example, the identification of potential ecological corridors and the construction of an ecological network in Chongqing were realized using the Linkage Mapper software. The results were as follows: (1) From 2005 to 2015, the patch area of cultivated land and grassland in Chongqing decreased by 0.08% and 1.46%, respectively, while that of built-up areas increased by 1.5%. The fragmentation degree of cultivated land was higher, and the internal connectivity of forestry areas was worse. (2) In total, 24 ecological sources were selected, and 87 potential ecological corridors and 35 ecological nodes were generated using the Morphological Spatial Pattern Analysis and the Conefor2.6 software. The total length of the ecological network in Chongqing is 2524.34 km, with an average corridor length of 29.02 km. (3) The overall complexity and network efficiency are high, but the spatial distribution of ecological corridors is uneven, especially in the southwest of Chongqing.

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Integrating the MCR and DOI models to construct an ecological security network for the urban agglomeration around Poyang Lake, China

Cited by 259 publications

References 77 publications

Research on Landscape Pattern Construction and Ecological Restoration of Jiuquan City Based on Ecological Security Evaluation

Research on Landscape Pattern Construction and Ecological Restoration of Jiuquan City Based on Ecological Security Evaluation

Can China’s Government-Oriented Environmental Regulation Reduce Water Pollution? Evidence from Water Pollution Intensive Firms

Identifying Ecological Corridors and Networks in Mountainous Areas

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