Evaluating the Relationships between Riparian Land Cover Characteristics and Biological Integrity of Streams Using Random Forest Algorithms | JoVE Visualize

Evaluating the Relationships between Riparian Land Cover Characteristics and Biological Integrity of Streams Using Random Forest Algorithms

Se-Rin Park¹, Suyeon Kim¹, Sang-Woo Lee²

¹Graduate Program, Department of Forestry and Landscape Architecture, Konkuk University, Gwangjin-Gu, Seoul 05029, Korea.

International Journal of Environmental Research and Public Health|April 3, 2021

View abstract on PubMed

Summary

Riparian forest cover is key for stream health. Increasing forests improves biological integrity, while high urban or agricultural land cover negatively impacts stream ecosystems, guiding effective watershed management.

Area of Science:

Ecology
Environmental Science
Conservation Biology

Background:

Riparian areas are crucial for maintaining river and stream health.
Land cover in riparian zones significantly influences aquatic ecosystems.
Effective riparian management requires understanding these land-cover-biology relationships.

Purpose of the Study:

To evaluate the impact of riparian land cover characteristics on stream biological integrity.
To assess the effectiveness of various biological indices and random forest regression in this evaluation.
To identify specific land cover thresholds affecting stream health.

Main Methods:

Utilized the Trophic Diatom Index (TDI), Benthic Macroinvertebrate Index (BMI), and Fish Assessment Index (FAI).
Employed random forest regression to model complex, nonlinear relationships.
Analyzed the influence of riparian land cover proportions and spatial patterns.

Main Results:

Land cover proportions (urban, agriculture, forest) had a greater impact than spatial patterns.
Riparian forest cover showed the strongest positive influence on stream biological integrity.
Identified critical thresholds: stream health improves up to 60% forest cover, declines rapidly above 25% urban cover, and significantly degrades between 20-40% agricultural cover.

Conclusions:

Riparian forests are vital for stream health, restoration, and management.
Partial dependence plots offer quantitative criteria for setting stream management objectives.
Findings support targeted land use planning to enhance aquatic ecosystem integrity.

Keywords: