[目的]探究成都市温江区道路绿地和校园绿地土壤抗蚀、抗冲特征及其影响因素,为城市绿地水土保持和生态可持续发展提供理论支持.[方法]采用野外取样与室内试验相结合的方法,对道路和校园绿地中乔木+草地、乔木+灌木、灌木、灌木+草地、草地开展土壤抗蚀抗冲性特征研究.[结果]＞5 mm土壤水稳性团聚体含量在道路(79.72％)和校园绿地(39.23％)均表现为最大.土壤总孔隙度、土壤含水量和土壤粉粒含量均表现为:校园绿地＞道路绿地(p＜0.05).土壤平均重量直径(MWD),土壤几何平均直径(GMD)、土壤抗蚀性指数、水稳性指数和抗冲指数均表现为:道路绿地＞校园绿地(p＜0.05),其中乔木+灌木和灌木+草地结构土壤抗蚀抗冲性优于其他植被结构,土壤抗冲系数均随坡度增大而减小.土壤抗蚀、抗冲性指数与＞5 mm 土壤水稳性团聚体、有机质含量和土壤黏粒均呈极显著正相关;与土壤团聚体破坏率(PAD),不稳定团粒指数(ELT)、＜0.25 mm,0.25～2 mm水稳性团聚体呈极显著负相关(p＜0.01).[结论]道路绿地乔木+灌木和灌木+草地结构土壤抗蚀抗冲性最好,校园绿地可以通过调整植被结构增强抗逆性和观赏性,降低土壤侵蚀风险.
Soil Anti-Erosion and Anti-Scouring Effects of Two Types of Urban Green Spaces and Factors Influencing Them in Wenjiang District,Chengdu City
[Objective]The anti-erosion and anti-scouring characteristics and factors influencing road and campus green spaces in Wenjiang District,Chengdu City were analysed in order o provide functional guidance for urban green space soil and water conservation and promote ecologically sustainable development.[Methods]The soil anti-erosion and anti-scouring properties of arbour+grass,arbour+bush,bush,bush+grass and grass in road and campus green spaces were characterised through field sampling and laboratory tests.[Results]The＞5 mm soil water-stable aggregate content was highest in both roads(79.72％)and campus green spaces(39.23％).Total soil porosity,soil water content,and silt content were greater in campus green spaces than road green spaces(p＜0.05).Mean weight diameter(MWD),geometric mean diameter(GMD),soil anti-erosion,water stability aggregate index,and anti-scouring were all higher in the road green space than in the campus green space(p＜0.05).Specifically,the anti-erosion and anti-scouring of arbour+bush and bush+grass structures were better than that of the other vegetation structures,and the soil anti-scouring coefficient decreased with increasing landscape slope.Soil anti-erosion and-scouring were positively correlated with＞5 mm soil water-stable aggregates,organic matter content,and soil clay particles,and negatively correlated with the percentage of aggregate destruction(PAD),unstable aggregate index(ELT)and＜0.25 mm and 0.25～2 mm water-stable aggregates(p＜0.01).[Conclusion]Arbour+bush and bush+grass had the best soil anti anti-erosion and-scouring effects on road green areas.Campus green space can reduce the risk of soil erosion by adjusting the vegetation structure,thereby enhancing the stress resistance and ornamental property.
urban green spacesphysico-chemical propertiessoil anti-erosionsoil anti-scouringvegetation properties
万方数据
维普
