1.西南大学资源环境学院,重庆 400715
2.西南大学生命科学学院,三峡库区生态环境教育部重点实验室,重庆 400715
何彦铮(2000—),男,硕士研究生,主要从事土壤侵蚀与面源污染研究。E-mail: 13640559909@163.com
李天阳(1988—),男,博士研究生,副教授,主要从事水土保持与面源污染研究。E-mail: tyli53@swu.edu.cn
收稿:2025-09-09,
修回:2025-10-05,
录用:2025-10-13,
网络首发:2025-12-08,
纸质出版:2026-04-01
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何彦铮,李天阳,李永灏,等.模拟降雨下植物篱-草沟系统茎秆直径对紫色土区泥沙粒径与氮磷迁移的影响[J].水土保持学报,2026,40(2):223-231.
HE Yanzheng, LI Tianyang, LI Yonghao, et al. Influence of stem diameter of hedgerow-grass ditch system on sediment particle size and nitrogen and phosphorus transport in purple soil areas under simulated rainfall[J].Journal of Soil and Water Conservation,2026,40(2):223-231.
何彦铮,李天阳,李永灏,等.模拟降雨下植物篱-草沟系统茎秆直径对紫色土区泥沙粒径与氮磷迁移的影响[J].水土保持学报,2026,40(2):223-231. DOI: 10.13870/j.cnki.stbcxb.2026.02.019. CSTR: 32310.14.stbcxb.2026.02.019.
HE Yanzheng, LI Tianyang, LI Yonghao, et al. Influence of stem diameter of hedgerow-grass ditch system on sediment particle size and nitrogen and phosphorus transport in purple soil areas under simulated rainfall[J].Journal of Soil and Water Conservation,2026,40(2):223-231. DOI: 10.13870/j.cnki.stbcxb.2026.02.019. CSTR: 32310.14.stbcxb.2026.02.019.
目的
2
为研究植物篱-草沟系统协同机制下泥沙颗粒分选规律及氮、磷迁移转化过程的影响。
方法
2
设置5种植物篱茎秆直径0(对照,CK)、0.1、0.2、0.4、0.8 cm与有、无草沟(0、0.5 cm)组合模式,室内构建植物篱-草沟系统,在90 mm/h雨强下开展模拟降雨试验,分析侵蚀泥沙50~1 000、2~50、<2 µm团粒体积百分比及其总氮(TN)、总磷(TP)迁移特征。
结果
2
1)在植物篱-草沟系统中,侵蚀泥沙团粒主要以粉粒(2~50 µm)为主。2)在有、无草沟条件下,0 cm茎秆直径坡面迁移泥沙的砂粒含量均显著最高(
p
<
0.05)。在有草沟条件下,0.8 cm茎秆直径的坡面迁移泥沙中黏粒、粉粒、砂粒的TP含量均最低(
p
<
0.05)。3)在有草沟条件下,0 cm茎秆直径下坡面迁移泥沙中3个不同粒径的TN含量均最低,其中0.1、0.2 cm茎秆直径处理的效果显著(
p
<
0.05)。4)当有草沟时,茎秆直径和砂粒TP含量呈显著负相关(
p
<
0.05)。无草沟条件下,茎秆直径和黏粒含量、粉粒TP含量、砂粒TP含量呈显著负相关(
p
<
0.05)。
结论
2
研究结果为防控紫色土区水土流失与面源污染提供理论基础。
Objective
2
This study aims to investigate the effects of the synergistic mechanism of the hedgerow-grass ditch system on the sediment particle sorting patterns and the migration and transformation processes of nitrogen and phosphorus.
Methods
2
Five combinations of hedgerows with stem diameters of 0 (control, CK), 0.1, 0.2, 0.4, 0.8 cm, and with or without grass ditches (0, 0.5 cm) were set up. A hedgerow-grass ditch system was constructed in the laboratory, and a simulated rainfall experiment was conducted under a rainfall intensity of 90 mm/h. The volume percentages of eroded sediment aggregates of 50-1 000 µm, 2-50 µm, and less than 2 µm, as well as the transport characteristics of total nitrogen (TN) and total phosphorus (TP), were analyzed.
Results
2
1) In the hedgerow-grass ditch system, the eroded sediment aggregates were mainly composed of silt particles (2-50 µm). 2) Under the conditions with and without grass d
itches, the content of sand particles in the transported sediment on the slope with a stem diameter of 0 cm was significantly the highest (
p
<
0.05). Under the condition with grass ditches, the TP contents of clay, silt, and sand particles in the transported sediment on the slope with a stem diameter of 0.8 cm were the lowest (
p
<
0.05). 3) Under the condition with grass ditches, the TN contents of three different particle sizes in the transported sediment on the slope with a stem diameter of 0 cm were the lowest. Among them, the treatment effects with stem diameters of 0.1 cm and 0.2 cm were significant (
p
<
0.05). 4) Under the condition with grass ditches, stem diameter was significantly negatively correlated with the TP content of the sand particles (
p
<
0.05). Under the condition without grass ditches, stem diameter was significantly negatively correlated with the clay content, the TP content of silt particles, and TP content of sand particles (
p
<
0.05).
Conclusion
2
The research findings provide a theoretical basis for the prevention and control of soil erosion and non-point source pollution in purple soil areas.
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