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Significant differences in optimal riparian buffer zone on water quality between different segments within the same

Haojie Han1, Xing Yan1, Xiaohan Li1

  • 1State Key Laboratory of Soil and Sustainable Agriculture, Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 211135, China; University of Chinese Academy of Sciences, Beijing, 100049, China; University of Chinese Academy of Sciences, Nanjing, 211135, China.

Journal of Environmental Management
|April 13, 2025
PubMed
Summary

Optimal riparian buffer zones vary significantly between river segments. Tailoring water quality management strategies to specific river sections, like the JuRong and XieXi segments, is crucial for effective watershed protection.

Keywords:
Interspersion and juxtaposition indexLandscape metricsLandscape thresholdRiparian buffer zoneWater quality

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Area of Science:

  • Environmental Science
  • Hydrology
  • Ecology

Background:

  • Riparian buffer zones are vital for water quality management.
  • Ignoring river segment variations leads to ineffective riparian buffer zone identification.
  • Traditional intensive agricultural watersheds present unique challenges for water quality management.

Purpose of the Study:

  • To investigate differences in optimal riparian buffer zone widths and their impact on water quality across different river segments.
  • To identify critical landscape thresholds that trigger abrupt water quality changes within riparian buffer zones.
  • To emphasize the need for segment-specific water quality management strategies.

Main Methods:

  • Water quality monitoring data collected over one year from the JuRong and XieXi segments of the Qinhuai River watershed.
  • Redundancy Analysis (RDA) and Variance Partitioning Analysis (VPA) to determine relationships between landscape metrics and water quality.
  • Nonparametric Change-Point Analysis (nCPA) to identify critical landscape thresholds.

Main Results:

  • Optimal riparian buffer zone widths differed: 100 m for JuRong segment and 600 m for XieXi segment.
  • Landscape metrics explained 96.7% of water quality variation in JuRong and 82.6% in XieXi.
  • Key landscape metrics influencing water quality were Interspersion and Juxtaposition index of Garden (IJI_Garden) and Interspersion and Juxtaposition index of Water (IJI_Water).
  • Critical thresholds for abrupt water quality changes were identified for both segments and metrics.

Conclusions:

  • Optimal riparian buffer zone width and its effectiveness in improving water quality are segment-specific.
  • Distinct water quality management strategies are necessary for different segments within the same river.
  • Considering intra-river variations is essential for effective watershed management and water quality improvement.