苏北海堤林带树木根系固土功能研究

A Study on the Root System Conserving Soil Action of Tree Belton the Seawall in Northern Jiangsu Province

该文通过对海堤林带树木根系及土壤抗冲、抗蚀和渗透性的测定分析，发现同一地段土壤的抗冲、抗蚀指数表土层大于底土层，树木根系，尤其是根径≤２ｍｍ的细根有较强的固持土壤功能，抗冲指数与根长、根量间有明显的相关性，单相关系数分别为０．９３２６和０．８２５６。有机质含量高的土壤抗蚀性强，抗蚀指数大，与有机质含量间的相关系数为０．８９３１，与细根的根长和根量的相关性相对较低，单相关系数分别为０．８２１６和０．７４７９。土壤孔隙率对渗透性的影响较大，表土层的稳渗系数高于底土层，且达到稳渗所需时间也较短，稳渗系数与土壤总孔隙率间的相关系数为０．８６３７。现有造林树种中，刺槐、刚竹、淡竹和柳杉林地土壤的抗蚀能力最大，护堤、护坡功能最强，水杉林地次之，杉木林地最差。

According to the analysis of tree root systems of tree belt on seawall in Northern Jiangsuprovince and characteristics of soil anti-scouring and anti-eroding as well as soil infiltration,the papergives out some research results as following . Tree root systems,especially the fibrous roots less than2mm in diameter ,have great soil conserving action ,and this action will get greater with the increase offine root’s length and weight. The interelated coefficient between index of soil anti-scouring andlength and weight of fine roots are 0.9326 and 0.8256. The soil with high soil organic matter contenthas big capacibility of soil anti-erosion . The interrelated coefficient between soil anti-erosion and soilcient between soil stable infiltration coefficient and total soil porosity is 0.8637.The present forestland s anti-loss capacibility of Robinia Pseudoacacia ,Phyllostachys nigra var.henonis and Crystomeria fartune is bigger than that of Metasiquoia glyptostroboides ,and Cuninghamia lanceolata’s soil anti-ero-sion abillty is the smallest.