神木水蚀风蚀交错带主要人工植物细根垂直分布研究

Vertical Distribution of Representative Plantation's Fine Root in Wind-water Erosion Crisscross Region,Shenmu

选择位于水蚀风蚀交错带强烈侵蚀中心的神木六道沟流域,通过分层挖掘法调查了6种典型人工植物细根垂直分布特征.结果表明;(1)各树、草种的细根垂直分布特征具有相似性,即浅层土壤中细根分布较多,深层土壤少;(2)细根密度(Fine root density,FRD)垂直分布存在较大差异,0-2 m土层刺槐(Robinia pseudoacacia)总FRD为1.195 m2·m-2,柠条(Caragana korshinskii)为0.927 m2·m-2,沙柳(Salix psammophila)为0.941 m2·m-2,沙棘(Hippophae rhamnoides)为1.248 m2·m-2,沙蒿(Artemisia ordosica)为0.446 m2·m-2,紫花苜蓿(Medicago sativa)为0.631 m2·m-2;(3)细根垂直分布与土壤水分分布存在显著相关性.

The research was carried out in Liudaogou watershed,Shenmu County,which is the most serious erosion centre of wind-water erosion crisscross region. Vertical fine roots distribution of 6 main plant species were investigated with dig method. The results showed that （1） fine roots of these 6 plant species had similar vertical distribution characteristics,i, e. mainly focused in the upper soil and few in the deep soil; （2） Their fine root density（FRD）had great difference,the total FRD of Robinia pseudoacacia was 1. 195 m^2 · m^-2 ir 0-2 m soil,Caragana korshinskii was 0. 927 m^2 · m^-2 ,Salix psammophila was 0. 941 m^2 · m^-2 , Hippophae rhamnoides was 1. 248 m^2 · m^-2 ,Artemisia ordosica was 0.446 m^2 · m^-2 and Medicago sativa was 0. 631 m^2 · m^-2 ,respectively. There were positive correlation between vertical distribution of fine root and soil water distribution in the profile; （3）Therefore,the further exploration between fine root distribution of different vegetation and soil water will promote vegetation construction in this region.