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Why do severely degraded ecosystems often require active restoration?
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ecological restoration
Wetland restoration along the Târnava Mică (Tîrnava Mică) River in Romania. A former gravel mine (left) was transformed into a functional wetland (right).
Severely degraded ecosystems often require active restoration because they have passed a threshold of degradation where they are unable to recover on their own, or can only do so at an extremely slow rate. While some sites may recover through passive restoration—simply by removing the source of disturbance—highly damaged areas often suffer from compromised soil and water resources due to erosion, earth-moving, or other major human-induced impacts.1
Active restoration is necessary to jump-start or accelerate the recovery process by addressing these fundamental physical, chemical, and biological impairments. This process involves several critical interventions:1
- Soil and Water Rehabilitation: Restorationists must often restore the original characteristics of the environment, such as adjusting soil pH, removing pollutants, or tilling to improve aeration.1
- Land Stabilization: Tools like physical structures, mulch, and strategic plantings are used to prevent further erosion and stabilize the landscape.1
- Biological Re-establishment: Because natural recovery is hindered, specialists must actively select and introduce appropriate seeds, seedlings, or cuttings to rebuild the plant community.1
- Mitigating Fragmentation: Active efforts are required to connect isolated habitat patches, bolster genetic diversity, and reestablish natural disturbance patterns, such as fire or flooding, to ensure long-term sustainability.1