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<p>Vegetation in riparian zone plays a vital role in alleviating eutrophication. However, a detailed evaluation of the effect of vegetation in riparian on the contents of phosphorus (P) and its forms leaching from soil is still scant.&#xa0;We quantified differences in (i) soil P fractions [labile P (H<sub>2</sub>O-Pi, NaHCO<sub>3</sub>-Pi, NaHCO<sub>3</sub>-Po), moderately labile P (NaOH-Pi, NaOH-Po), stable P (HCl-Pi, Residual-P)], (ii) leachate volume, and (iii) leachate P concentrations and leaching fluxes [total phosphorus (TP), dissolved phosphorus (DP), particulate phosphorus (PP)] among three plantation types located in a riparian zone near Taihu Lake, Eastern China: pure poplar forest, <i>Populus</i>–<i>Ligustrum lucidum</i> mixed forest, and <i>Populus</i>–<i>Photinia serratifolia</i> mixed forest.&#xa0;We found that compared with the pure poplar forest, the two mixed forests exhibited lower soil P concentrations and reduced P leaching loss. Overall, soil labile P and stable P contents in the mixed forests decreased by 2.9–21.3% and 1.7–19.5%, whereas moderately labile P content increased by 3.2–31.8%. In both mixed forests, soil leachate volume decreased by 6.4–30.5%, along with TP, DP and PP concentrations, which decreased by 13.6–49.7%, 9.6–50.7%, and 2.7–80.4%, respectively. Accordingly, the leaching fluxes of TP, DP, and PP also decreased by 15.3–57.3%, 3.1–56.7%, and 0.4–81.2%, respectively.&#xa0;These reductions may be attributed to the fact that mixed forests intercept greater rainfall, while their enriched litter layer and well-developed root systems enhance nutrient retention, indicating that <i>Populus</i>–<i>Ligustrum lucidum</i> and <i>Populus</i>–<i>Photinia serratifolia</i> mixed forests reduced soil P leaching loss. We propose that planting arbor-shrub mixed forests during shelterbelt establishment would be beneficial for reducing soil P leaching in the riparian zone of Taihu Lake.</p>

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Arbor-Shrub Mixed Vegetation Reduces Soil Phosphorus Leaching in a Lake Riparian Zone, Taihu, China

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Junjie Li,
  • Jiahao Zhao,
  • Xiaodan Sun,
  • Zaixiang Yuan,
  • Yaru Wang,
  • Qingwei Guan

摘要

Vegetation in riparian zone plays a vital role in alleviating eutrophication. However, a detailed evaluation of the effect of vegetation in riparian on the contents of phosphorus (P) and its forms leaching from soil is still scant. We quantified differences in (i) soil P fractions [labile P (H2O-Pi, NaHCO3-Pi, NaHCO3-Po), moderately labile P (NaOH-Pi, NaOH-Po), stable P (HCl-Pi, Residual-P)], (ii) leachate volume, and (iii) leachate P concentrations and leaching fluxes [total phosphorus (TP), dissolved phosphorus (DP), particulate phosphorus (PP)] among three plantation types located in a riparian zone near Taihu Lake, Eastern China: pure poplar forest, Populus–Ligustrum lucidum mixed forest, and Populus–Photinia serratifolia mixed forest. We found that compared with the pure poplar forest, the two mixed forests exhibited lower soil P concentrations and reduced P leaching loss. Overall, soil labile P and stable P contents in the mixed forests decreased by 2.9–21.3% and 1.7–19.5%, whereas moderately labile P content increased by 3.2–31.8%. In both mixed forests, soil leachate volume decreased by 6.4–30.5%, along with TP, DP and PP concentrations, which decreased by 13.6–49.7%, 9.6–50.7%, and 2.7–80.4%, respectively. Accordingly, the leaching fluxes of TP, DP, and PP also decreased by 15.3–57.3%, 3.1–56.7%, and 0.4–81.2%, respectively. These reductions may be attributed to the fact that mixed forests intercept greater rainfall, while their enriched litter layer and well-developed root systems enhance nutrient retention, indicating that Populus–Ligustrum lucidum and Populus–Photinia serratifolia mixed forests reduced soil P leaching loss. We propose that planting arbor-shrub mixed forests during shelterbelt establishment would be beneficial for reducing soil P leaching in the riparian zone of Taihu Lake.