王东沟不同坡向刺槐细根分布特征研究

采用土钻法研究了渭北黄土高原主要造林树种刺槐的根系分布特征。结果表明,在以坡向为主要影响因子的立地条件下,刺槐的根系分布特征表现出明显差异。不同径级根系的长度和表面积等主要指标,在土壤中的垂直分布和水平分布均表现出不同的趋变模式。阴坡立地上的细根长度和根系表面积的水平分布(距地面50cm的土层中)和垂直分布均比阳坡大且较均匀,而阳坡立地上,细根长度和体积表面积均表现出随距树干距离增加而急剧减少的趋势。阴坡立地的刺槐根系较之阳坡立地具有更大的生长潜势。

Researches on root distribution characteristics of Robinia pseudoacaciastand in Wangdonggou on different site conditions

By using soil-drilling method,this research investigated the root distribution characters of Robinia pseudoacacia in Weibei loess plateau.The results indicated that there were remarkable differences in both the vertical and horizontal root distribution patterns of Robinia pseudoacacia on slopes with different directions.And the root distritution patterns of main root indexes,such as root length and surface areas of unit volume of different diameter,changed both in vertical and horizontal directions.Fine root length and surface areas of unit soil volume in the north-facing site are much greater and more equal than that in the south-facing site in vertical and horizontal directions.With horizontal distance increasing,fine root length and surface areas of unit soil volume in the south-facing site are decreasing greatly.The growing potentiality of Robinia pseudoacacia in the north facing site is much better than that in the south facing site.