Abstract
Quantifying the dynamics of green infrastructure (GI) in agricultural peri-urban areas is of great significance to the regional ecological security, food security, and the sustainable development of urban integration. Based on remote sensing images, this study aims to provide a spatiotemporal dynamic assessment of the GI in Baisha District from 2007 to 2018 to improve the layout of GI and planning policies from the perspective of ecological security and food security. Research methods include landscape pattern indices, spatial autocorrelations, and grid analyses in this case study. The results suggest that ensuring the dominant position of farmland is critical to maintaining the composition and connectivity of the overall GI. The recreation, inheritance of farming culture, and ecosystem service functions of farmland should be improved to meet the growing needs of urban residents. GI includes the farmland, greenspace, and wetland on both sides of the Jialu River that should be retained and restored as much as possible to protect natural ecological processes. Simultaneously, construction of important urban facilities and residential areas in flooded areas should be banned. A part of the evenly distributed large greenspace patches should be moved to both sides of the Jialu River to increase the agglomeration effect of GI. Optimization measures in this case study also offer a perspective for other agricultural peri-urban areas that have experienced similar urbanization.
Highlights
Due to the sobering impacts on the geography, demographics, economies, and spatial evolution of cities [1], urbanization has received great attention in recent years by increasingly more social scientists, urban planners, and geographers [2,3,4] Earth is becoming urbanized on a scale unprecedented in history
The percentage of high-high clusters of Percentage of Landscape (PLAND) and COHESION in 2018 decreased with the increase of scale, while the percentage of high-high clusters of Landscape Shape Index (LSI) behaved contrarily; in addition, the percentage of low-low clusters of PLAND increased by 14% on the 1.5 km grid scale and the percentage of high-high clusters increased by 5% on the 0.5 km grid scale
The agricultural peri-urban area has often not formed a complete green infrastructure (GI) system, unlike the city center [58], as we found that the high-connectivity clusters for farmland, water areas, and forestland are concentrated in the north, while low-connectivity clusters are distributed in the south
Summary
Due to the sobering impacts on the geography, demographics, economies, and spatial evolution of cities [1], urbanization has received great attention in recent years by increasingly more social scientists, urban planners, and geographers [2,3,4] Earth is becoming urbanized on a scale unprecedented in history. Urban integration has become an important feature of urbanization, emphasizing extensive union and integration between cities [6,7] The peri-urban area is the main spatial connection region between cities; its land-use changes rapidly with the deepening of urban integration [8,9,10,11] and its green infrastructure (GI), known as natural life support systems including farmlands, forestlands, and wetlands have undergone major changes [8,12,13]. In peri-urban areas dominated by agricultural land, prominent changes in GI are mainly manifested in the continuous reduction of farmland, which is evident in Sweden [14], Australia [15], Ghana [16], and other countries.
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