Urban expansion simulation and the spatio-temporal changes of multiple ecosystem services in Atlanta Metropolitan area, USA

Authors: XIAO SUN*, , John Crittenden, School of Civil & Environmental Engineering, Georgia Institute of Technology
Topics: Landscape, Urban and Regional Planning, Spatial Analysis & Modeling
Keywords: Ecosystem services, Land use simulation, InVEST model, Scenarios
Session Type: Poster
Day: 4/6/2019
Start / End Time: 9:55 AM / 11:35 AM
Room: Lincoln 2, Marriott, Exhibition Level
Presentation File: Download

Understanding the effects of urbanization on ecosystem services (ESs) can provide scientific guidance for land use planning and the protection of ESs. We established a framework to assess the spatial distributions of ESs in the Atlanta Metropolitan area (AMA) from 1985 to 2012. A comprehensive ecosystem service (CES) index was developed to reflect the total supply of ESs. Associated with the influential factors, we simulated the business as usual scenario in 2030. Four alternative scenarios, including more compact growth (MCG), riparian vegetation buffer (RVB), soil conservation (SC), and combined development (CD) scenarios were developed to explore the optimal land use strategies which can enhance the ESs. The results showed that the CES and most of ESs decreased significantly due to the sprawling expansion of built-up land. Scenario analysis revealed that the CD scenario performs best in CES value, while it performs the worst in food supply. Compared with the RVB and SC scenarios, MCG scenario is a more optimal land use strategy to enhance the ESs without at the expense of food supply. To integrate multiple ESs into land use planning, corresponding ecological measures should be implemented to enhance: (1) the water yield and water purification in urban core counties, (2) the carbon storage, habitat quality, and recreational opportunity in counties around the core area, and (3) the soil conservation and food supply in surrounding suburban counties. The land use strategies and ecological measures can provide references for enhancing the ESs in the AMA and other metropolitan areas.

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