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<p>Riparian buffer zones play critical roles in mediating land use impacts on river ecosystems, yet the optimal spatial scales for these protective effects remain poorly understood. We examined how land-use patterns influence macrobenthic communities within buffer zones ranging from 100 to 2000&#xa0;m along the Tanghe River, China. Our analysis revealed scale-dependent effects of land use on benthic communities dominated by <i>Radix auricularia</i>,<i> Bellamya</i> sp., and <i>Chironomus plumosus</i>. In narrow riparian zones (≤ 100&#xa0;m), local physicochemical conditions were the primary drivers of benthic community structure, explaining 24% of the variation. At broader scales (250–2000&#xa0;m), the combined effects of land use and water chemistry accounted for 43% of macrobenthic variation, driven by changes in water temperature, dissolved oxygen, and redox potential. Path analysis (goodness of fit [GOF] &gt; 0.60) showed that land-use impacts on benthic diversity and functional traits were most pronounced at intermediate scales (500–1000&#xa0;m), primarily mediated through changes in water quality. Our results suggest that protecting 500–1000&#xa0;m buffer zones is the most effective strategy for maintaining river ecosystem integrity, providing quantitative support for spatially-explicit watershed management and riparian landscape conservation.</p>

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Critical Buffer Zones (500–1000 m) for River Ecosystem Integrity: Scale-Dependent Land Use Impacts on Macrobenthos in the Tanghe River, China

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Xiaoyue Lin,
  • Xuemei Han,
  • Jiading Yang,
  • Fengyu Liu,
  • Shujia Chang

摘要

Riparian buffer zones play critical roles in mediating land use impacts on river ecosystems, yet the optimal spatial scales for these protective effects remain poorly understood. We examined how land-use patterns influence macrobenthic communities within buffer zones ranging from 100 to 2000 m along the Tanghe River, China. Our analysis revealed scale-dependent effects of land use on benthic communities dominated by Radix auricularia, Bellamya sp., and Chironomus plumosus. In narrow riparian zones (≤ 100 m), local physicochemical conditions were the primary drivers of benthic community structure, explaining 24% of the variation. At broader scales (250–2000 m), the combined effects of land use and water chemistry accounted for 43% of macrobenthic variation, driven by changes in water temperature, dissolved oxygen, and redox potential. Path analysis (goodness of fit [GOF] > 0.60) showed that land-use impacts on benthic diversity and functional traits were most pronounced at intermediate scales (500–1000 m), primarily mediated through changes in water quality. Our results suggest that protecting 500–1000 m buffer zones is the most effective strategy for maintaining river ecosystem integrity, providing quantitative support for spatially-explicit watershed management and riparian landscape conservation.