中国水土保持科学2025，Vol.23Issue(5)：196-206,11.DOI:10.16843/j.sswc.2025032
模拟多场次暴雨条件下3种草坪坡地水土流失特征
Soil erosion characteristics of three lawn slopes under the condition of simulated multiple rainstorms
摘要
Abstract
[Background]Against the backdrop of worsening global climate change and frequent occurrences of extreme precipitation events,the issue of urban soil erosion has become increasingly prominent.Lawns serve as an important measure for managing urban soil erosion,and Trifolium repens,Lolium perenne,and Cynodon dactylon are typical high-quality grass species for soil and water conservation.However,it remains unclear how these three types of lawns perform in mitigating runoff and sediment under the condition of multiple rainstorms,and which one is more suitable for application in urban soil erosion control.Therefore,in order to explore the characteristics of soil erosion on sloping land covered by these three types of lawns under the condition of multiple rainstorms.[Methods]For this study,three runoff plots were selected,each measuring 10 m in length,2.5 m in width,with a slope of 13°and soil type mainly consisting of red soil and clay loam.Indoor artificial simulated rainfall was employed under the condition of 6 rainstorms(60 mm/h).ANOVA test was used to analyze the significance of differences,curve regression models were applied to obtain the optimal fitting effect for correlation analysis,and principal component analysis was adopted for comprehensive evaluation of soil and water conservation.The soil erosion characteristics of the three types of lawns and the lawn with the best soil and water conservation effect were thus derived.[Results]1)The runoff generation time in T.repens and C.dactylon grasslands showed a trend of first increasing and then decreasing,while no stable pattern was observed in L.perenne grasslands.Among them,C.dactylon grasslands exhibited the best effect in inhibiting and delaying runoff,followed by T.repens,with L.perenne performing relatively poorly.2)Under 6 rainfall events,the total runoff yields of T.repens,L.perenne,and C.dactylon lawns were 133.02 L,183.25 L,and 143.32 L,respectively,and the total sediment yields were 21.43 g,9.38 g,and 5.89 g,respectively.The total runoff yield of T.repens was 7.19%-27.41%lower than that of C.dactylon and L.perenne,and the total sediment yield of C.dactylon was 37.38%-72.55%lower than that of L.perenne and T.repens.T.repens showed the best runoff reduction benefit,while C.dactylon had the best sediment reduction effect.3)A significant power function relationship was found between runoff and sediment on the sloped land of the three lawn types,indicating a close quantitative correlation between these two key erosion indicators.Comprehensive evaluation,considering multiple factors,revealed that C.dactylon had the optimal soil and water conservation benefit.[Conclusions]Comprehensive analysis indicates that herbaceous plants with multi-level horizontal leaves and stolon have a better inhibitory effect on soil erosion.Obviously,under the condition of multiple rainstorms,C.dactylon is the optimal choice for controlling soil erosion in urban lawns,followed by T.repens and L.perenne.This study can provide a reference for the selection of urban lawns,as well as for understanding the mechanisms of soil erosion and soil and water conservation in grasslands.关键词
坡地草坪/模拟降雨/产流产沙/暴雨/减流减沙Key words
slope lawn/simulated rainfall/abortion and sand/rainstorm/flow reduction and sediment reduction分类
农业科学引用本文复制引用
赵学海,王刘雅,马建刚..模拟多场次暴雨条件下3种草坪坡地水土流失特征[J].中国水土保持科学,2025,23(5):196-206,11.基金项目
国家自然科学基金"暴雨条件下城市绿地积水入渗机制研究"(42261007) （42261007）
西南林业大学博士科研启动基金"滇西南甘蔗地土壤大孔隙特征及其影响要素"(202220050049) （202220050049）
