Assessing and Forecasting the Health of Fragile Ecosystems

Greg Howard
22nd February, 2024

Assessing and Forecasting the Health of Fragile Ecosystems

Ningxia Hui Autonomous Region (NHAR), China.

Photo adapted from: Matthew Summerton / CC BY SA (Source)
Ecological security – the ability of ecosystems to maintain their functions and provide essential services – is increasingly threatened by land use changes, particularly in ecologically fragile regions. These regions often face challenges like desertification, soil erosion, and biodiversity loss, impacting both the environment and human wellbeing. Traditional approaches to ecological restoration often focus on repairing damaged land without fully considering how future development will affect the overall landscape[2]. This can lead to restoration efforts being undermined by subsequent land use decisions. A team from China University of Mining and Technology, Beijing, recently addressed this issue with a new framework for assessing ecological security in the Ningxia Hui Autonomous Region (NHAR) of China[1]. The study aimed to develop a more comprehensive method for evaluating ecological security, taking into account potential future land use scenarios. The researchers recognized that existing models for assessing ecological security in fragile areas tend to be similar, and a more integrated approach was needed to address complex ecological issues. Their solution involved combining three modelling techniques: PLUS, Ecological Security Index (ESI), and Circuit Theory. The PLUS model (Policy-induced Urbanization and Land Use Simulation) was used to predict how land use might change in the NHAR under four different scenarios: economic development, ecological protection, balanced development, and a continuation of current trends. This model simulates future land use patterns based on various factors, such as population growth, economic policies, and environmental regulations. The researchers then created a new Ecological Security Index (ESI). This index isn’t a single measurement, but a combination of three factors: how well the ecosystem functions (ecological service function), the overall health of the ecosystem, and the level of risk it faces. By combining these elements, the ESI provides a more holistic assessment of ecological security than previous methods. Finally, the researchers used Circuit Theory to identify key areas for ecological protection and restoration. Circuit Theory, borrowed from physics, treats the landscape like an electrical circuit, where areas of high ecological value are like low-resistance pathways. This allows researchers to identify the most important corridors for wildlife movement and the areas most critical for maintaining ecological connectivity. This approach builds on earlier work that highlighted the importance of identifying ecological sources, corridors, and barriers to improve landscape connectivity[2]. The results showed that between 2000 and 2030, the NHAR experienced a significant increase in built-up areas, while grassland and farmland remained the dominant land cover types, accounting for around 80% of the region. Areas with high ecological security were primarily located in mountainous regions – Helan Mountain, Liupan Mountain, and the central NHAR – while areas with low ecological security were concentrated in urban and arid regions like Shapotou District and Yinchuan City. A concerning trend observed was the decreasing aggregation of high-security areas and increasing fragmentation of ecological patches after 2010. This fragmentation is expected to worsen under an economic development scenario, but can be mitigated by prioritizing ecological protection and balanced development. Interestingly, the number of identified ‘ecological sources’ – areas of high ecological value – increased between 2000 and 2020, but their overall size decreased. This suggests that while more areas are being recognized as important for ecological security, they are becoming smaller and more isolated. The study also found that the economic development scenario led to the most landscape fragmentation, while the ecological protection and balanced development scenarios offered some improvement. This aligns with findings from other studies emphasizing the central role of land use management in achieving sustainable development[3]. The research highlights the importance of considering multiple future scenarios when planning for ecological security. The coupled “PLUS-ESI-Circuit Theory” framework developed by the researchers provides a valuable tool for policymakers to assess the potential impacts of different land use decisions and to prioritize areas for conservation and restoration. This approach also acknowledges the need to integrate ecological considerations with socio-economic factors, as demonstrated by the success of the balanced development scenario. Furthermore, the study’s focus on identifying ecological corridors and barriers is consistent with the broader understanding of ecological security as a function of both the condition of ecosystems and their connectivity[4]. The findings also support the idea that effective ecosystem service conservation requires considering diverse decision-making preferences[5].

EnvironmentSustainabilityEcology

References

Main Study

1) Integrated assessment and prediction of ecological security in typical ecologically fragile areas.

Published 20th February, 2024

https://doi.org/10.1007/s10661-024-12453-0

Related Studies

2) Integrating the Ecological Security Pattern and the PLUS Model to Assess the Effects of Regional Ecological Restoration: A Case Study of Hefei City, Anhui Province.

https://doi.org/10.3390/ijerph19116640

3) Development of a dynamic strategy planning theory and system for sustainable river basin land use management.

Journal: The Science of the total environment, Issue: Vol 346, Issue 1-3, Jun 2005

4) Fuzzy evaluation of the ecological security of land resources in mainland China based on the Pressure-State-Response framework.

https://doi.org/10.1016/j.scitotenv.2021.150053

5) Integrating decision-making preferences into ecosystem service conservation area identification: A case study of water-related ecosystem services in the Dawen River watershed, China.

https://doi.org/10.1016/j.jenvman.2023.117972


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