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The Construction of Regional Ecological Security Pattern Based on a Multi- Factor Comprehensive Model and Circuit Theory

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The Construction of Regional Ecological Security Pattern Based on a Multi- Factor Comprehensive Model and Circuit Theory Some Tables in the form of Figs. p-ISSN: 0972-6268 Nature Environment and Pollution Technology (Print copies up to 2016) Vol. 20 No.3 pp. 1115-1126 2021 An International Quarterly Scientific Journal e-ISSN: 2395-3454 Original Research Paper Originalhttps://doi.org/10.46488/NEPT.2021.v20i03.019 Research Paper Open Access Journal The Construction of Regional Ecological Security Pattern Based on a Multi- Factor Comprehensive Model and Circuit Theory H.R. Yu*, Y.Z. Wang*(**) †, Z. Liang*and C.K. Min*** *School of architecture and planning, Anhui Jianzhu University, Hefei 230022, China **Anhui Urbanization Development Research Center, Hefei 230022, China ***School of English, Welsh School of Architecture, Cardiff University, Cardiff CF10 3BA, UK †Corresponding author: Y.Z. Wang; [email protected] ABSTRACT Nat. Env. & Poll. Tech. Website: www.neptjournal.com Various ecological problems have become increasingly prominent due to the accelerated growth of urbanization. Ecological security and ecological conservation have become an important topics in Received: 19-11-2020 the current scenario. This study took southern Anhui as an example, constructing comprehensive Revised: 09-12-2020 assessment models to conduct source identification from three perspectives, i.e. ecosystem services, Accepted: 22-02-2021 ecological sensitivity and residents’ ecological needs. Landscape resistance surface was built based on Key Words: the reciprocal of habitat quality and night-time light data. According to the circuit theory, the ecological Regional Security pattern process in the heterogeneous landscape was simulated to identify ecological corridors, extract pinch Circuit theory points and divide barriers that need improvement, thereby to construct the southern Anhui ecological Residents’ needs security pattern (ESP). The pattern comprised 20 ecological sources, 37 ecological corridors, 9 pinch Development strategy points and 2 levels of improvement areas. Specifically, ecological sources were mainly distributed within the area of Huangshan city and Xuancheng city, mostly covered with trees; ecological corridors were mostly located in the northern part of the research area; pinch points were mainly farmland or beside construction land; the primary improvement area was mainly in Chaohu city and Maanshan city, while the secondary improvement area was distributed around the primary area. The study discussed the diversified improvement strategies of different barriers and introduced the optimization scheme “one centre, two wings, one belt”, providing planning advice for decision-makers. The study expanded the construction of regional ESP, and partly guided the steady development of ESP of southern Anhui. INTRODUCTION Currently, scholars in various fields at home and abroad have discussed the structure (He et al. 2020) and function The rapid development of urbanization has caused an increas- (Song et al. 2020) of ESP, as well as its construction (Xun ingly intense contradiction between economic development et al. 2018) and assessment (Yin et al. 2011, Schröter et al. and ecological conservation. Ecological systems like forests, 2020). In addition, scholars have conducted massive research waters, and wetlands have been destroyed, causing deterio- concerning biodiversity conservation (Chen et al. 2017), na- ration in the habitat quality and a decline in the biodiversity. ture reserve planning (Jia et al. 2005), remedy for ecosystem On the other hand, people have higher needs for life thanks (Meng et al. 2012), etc. The research on ESP construction in to the economic development, as well as new demands for China has formed a mainstream paradigm of “source iden- ecosystem services. Ecological security pattern, the bridge tification—resistance surface construction—corridor con- between ecosystem services and societal development, is struction”. Generally speaking, the identification of sources regarded as a crucial strategic tool to guarantee regional should provide important ecological services and own nice ecological security and increased well-being. The planning landscape connectivity, greatly needed in regions. Traditional of ecological security pattern (ESP) has become a key for the ecological source identification mostly comprises two meth- Chinese governments at all levels to ensure the sustainable ods: the first is to directly determine natural reserves, national development of the regional economy, and coordinate the parks, scenic spots, etc. as an ecological source. Though relationship between ecosystem and economic society. Also, convenient to operate, it may lack the accuracy of patch it is regarded as a fundamental and a crucial method to realize assessment. Some scholars chose patches with a relatively regional ecological security, and one of the strategic modes stable type of eco-utilization in the long term as ecological for national land development and protection (Nathwani et sources, for example, woodland, grassland, farmland, etc. al. 2019, Huang et al. 2020). However, this method does not take land-use heterogeneity 1116 H.R. Yu et al. into account, as a land of the same type in different regions of ecological flow in a heterogeneous landscape, identify still differs to a certain degree. Another more scientific meth- important patches and corridors by calculating isolation od is to construct a comprehensive indicator system to assess degree between patches, and then determine the range of regional parcels, and then to determine ecological sources. corridor. For resistance surface construction, researchers The chosen indicators are determined by the functional im- often determine the resistance value of each patch based portance of ecosystem services, ecological sensitivity, etc. on their experience, leading to relatively large differences (Peng et al. 2018). The weight and constitution of indicators in the resistance value of different regions. The relatively in different areas are determined according to the local sit- more scientific method at present is to construct a resistance uation. Specifically speaking, indicators comprises impor- surface based on the reciprocal of habitat quality coupling tant ecosystem services indicators like water conservation, with night-time light data (Wang et al. 2019). biodiversity, carbon fixation ability, soil conservation, etc. This study chose southern Anhui as a research area and (Gao et al. 2020), and ecological sensitivity indicators like attempted to: (1) comprehensively consider the coordination elevation, slope, etc. However, scholars at home and abroad between ecosystem services and residents’ needs in the con- have not thoroughly considered the relationship between struction of ESP, determine ecological sources and verify ecosystem services, ecological sensitivity and residents’ their rationality; (2) based on the reciprocal of habitat quality, needs for ecosystem services. The natural ecosystem cannot utilize the modification of night-time light data to construct survive without “people”, which means that a sustainable regional landscape resistance surface; (3) based on circuit society needs a balanced development between ecological theory, select ecological corridor and its range, determine the basic services and residents’ ecological needs (Li et al. 2020). pinch points that could influence the connectivity of ecolog- The construction of ESP is a multi-goal optimization process ical corridor and barrier, and study diversified strategies of based on the coordinated “society-economy-ecology” devel- ecological conservation, to provide advice for the planning opment. In this regard, this study considered residents’ needs of regional ecological conservation. for ecosystem services when selecting ecological sources. The key to the ecological corridor selection is to sim- MATERIALS AND METHODS ulate species migration and construct a resistance surface. Study Area and Data Sources Currently, scholars mainly apply circuit theory (Guo et al. 2020), minimum cumulative resistance (MCR) model (Li Southern Anhui, located in southern Anhui Province et al. 2007), and cellular automaton (Zhou et al. 2020) to (29°31'-31°N, 116°31'-119°45'E) (Fig. 1), has an area of simulate the movement of species migration. MCR model 31.2 thousand km2. It has abundant forest resources and and ant colony optimization algorithms can only determine soils, with 20.5 thousand km2 forest area, accounting for the position of the ecological source, as well as the posi- 45.7% of the total forest area in Anhui province. Southern tion and direction of ecological corridor, unable to further Anhui is an important ecological source of the Yangtze identify patches and corridors that are more crucial. While River Delta, and also one of the most famous tourist spots circuit theory can be applied to study the movement pattern in China. Long-term land development has caused severe Fig. 1: Land-use type and elevation in southern Anhui The data sources used in this Fig.study 1: Land-use were as type follows(1) and elevation the in 2018 southern land Anhui. use and NDVI database was provided by the Resource and Environment Data Cloud Platform; (2) digital elevation model (DEM) data was obtained Vol. 20,from No. the 3, 2021 Geospatial • Nature Data Environment Cloud website and Pollution at a spatial Technology resolution of 90m; (3) meteorological data from National Tibetan Plateau Data; (4) soil data from Food and Agriculture Organization of the United Nations (FAO). (5) the 2018 NPP-Virrss was provided by the National Oceanic and Atmospheric
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