Determination of Landscape Ecological Network of Wetlands in the Yellow River Delta
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DEGRADATION AND ECOLOGICAL RESTORATION OF ESTUARINE WETLANDS IN CHINA
Determination of Landscape Ecological Network of Wetlands in the Yellow River Delta Pifu Cong 1 & Kexin Chen 2 & Limei Qu 1 & Jianbo Han 1 & Zhengxian Yang 1 Received: 14 November 2019 / Accepted: 12 August 2020 # Society of Wetland Scientists 2020
Abstract Many wetlands in the Yellow River Delta have degraded as a result of drainage and conversion for development and other land uses in recent years. To provide information for targeted protection and restoration of degraded wetlands, we explored the landscape ecological network based on the wetland classification data in 2016 by using landscape connectivity index, leastcost distance model, gravity model and digital elevation model hydrological analysis. The landscape ecological network consisted of 10 ecological sources, 35 ecological corridors (13 primary ecological corridors, 22 secondary ecological corridors) with a width of 200 m and 5 ecological nodes. The corridors constructed with patch and patch centroid were different, and the ecological corridors constructed with patch unit show a minimum accumulated resistance. The distribution of ecological sources and nodes was in good agreement with the actual conditions, and the network was reliable. The establishment of this ecological network will play a key role in the improvement of landscape connectivity, optimization of the ecological environment and increase in species diversity in the wetland, which can provide a reference for the optimization and restoration of the overall landscape pattern in this region. Keywords Yellow River Delta wetland . Landscape connectivity . Least-cost distance model . Landscape ecological network
Introduction Wetlands are important features in the landscape, providing numerous beneficial services for people and wildlife. Some of these services include protecting and improving water quality, providing fish and wildlife habitats, storing floodwaters and maintaining surface water flow during dry periods. Wetlands perform hydrologic, biogeochemical and biological functions that provide ecosystem services linked to human health and well-being (Junk et al. 2013). Ecological environment safety is a vital component of national security and an essential guarantee for sustained and healthy economic and social development (Cao et al. 2019). In recent years, excessive farmland reclamation, artificial construction, oil exploration, environmental pollution and other human activities in the Yellow
* Limei Qu [email protected] 1
National Marine Environmental Monitoring Center, Dalian, China
2
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China
River Delta area have brought about a series of ecological problems, such as loss of soil and water, land desertification, reduced grassland resources, reduced biodiversity and significantly changed wetland landscape pattern, and they have caused serious destruction to the ecological environment (Ma et al. 2019). It is urgent to
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