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

作　　者：成向荣[1] 黄明斌[1] 邵明安[1] 

机构地区：[1]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室

出　　处：《西北植物学报》2007年第2期321-327,共7页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金(40471062);西北农林科技大学创新团队项目

摘　　要：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.

关 键 词：水蚀风蚀交错带 细根垂直分布 土壤水分 

分 类 号：Q948.118[生物学—植物学]