水土保持学报2025，Vol.39Issue(2)：40-47,8.DOI:10.13870/j.cnki.stbcxb.2025.02.027
不同种植密度下草本植物根系生长对土壤侵蚀阻力的影响
Effects of Herbaceous Root Growth on Soil Resistance to Erosion under Different Planting Densities
摘要
Abstract
[Objective]To explore the effects of roots on soil consolidation and erosion reduction under different planting densities.[Methods]Typical herbaceous plants,including ryegrass(Lolium perenne)and alfalfa(Medicago sativa)on the Loess Plateau were selected as the research objects.By setting three planting densities,i.e.100,300 and 500 plants/m2,the effects of plant root growth on soil resistance to erosion were studied experimentally.[Results]During the observation period,the root characteristics showed a trend of rapid increase at first and then slow decrease,with those of ryegrass and alfalfa being the best in medium and high planting-density plots,respectively.Driven by root growth,soil organic matter content showed an increasing trend,with that of ryegrass and alfalfa increasing the most in medium and high planting-density plots,which increased by 2.44 g/kg and 1.84 g/kg,respectively.Under the combined influence of changes in root and soil characteristics,rill erodibility index decreased rapidly at first and then showed a fluctuating change during the observation period,while soil critical shear stress did not show a stable trend.Ryegrass roots had the best erosion reduction effect in the medium planting-density plot,where rill erodibility index decreased by 18.86 s/m.Alfalfa roots had the better erosion reduction effect in the medium and high planting-density plots,where rill erodibility index decreased by 13.42 s/m and 10.82 s/m,respectively.[Conclusion]Considering the effect of planting density on roots and soil characteristics,the medium density(300 plants/m2)and high density(500 plants/m2)planting patterns are suitable for soil erosion control by growing ryegrass and alfalfa,respectively.关键词
草本植物根系/种植密度/土壤侵蚀阻力/动态变化/黄土高原Key words
herbaceous roots/planting density/soil resistance to erosion/dynamic change/the Loess Plateau分类
农业科技引用本文复制引用
刘均阳,周正朝,韩玮霄..不同种植密度下草本植物根系生长对土壤侵蚀阻力的影响[J].水土保持学报,2025,39(2):40-47,8.基金项目
国家自然科学基金项目(42277320,42407478) （42277320,42407478）
陕西省自然科学基础研究计划项目(2024JC-YBQN-0314,2024JC-YBQN-0496) （2024JC-YBQN-0314,2024JC-YBQN-0496）
延安大学博士启动项目(YAU202313804) （YAU202313804）
