浑善达克沙地黄柳人工林根系分布及生物量研究

Root Distribution and Biomass of Salix gordejevii in Hunshandake Sandland

对浑善达克沙地一年生、二年生、三年生黄柳人工林根系分布及生物量进行了调查、测定。结果表明:①在流动沙丘上人工栽植的黄柳,其根系主要由直径小于2.0 mm的中根和细根构成,其数目占剖面根系总数的90%以上,其中又以直径小于0.5 mm细根所占比例最高,其数目占剖面根系总数的50%以上。②根系主要分布在10～30 cm的土层中,可见其根系主要吸收10～30 cm土层内的水分和养分。③根系重量在各土层中呈随土层深度加深而降低的分布趋势。④根系主要呈水平分布,水平根非常发达,随着植株的不断生长,这一特征越来越明显。

Root distribution and biomass of Salix gordejevii plantation of different years old were observed and calculated.The root system of Salix gordejevii is mainly made up of fine roots and middle roots（diameter2.0 mm）,and fine roots（diameter0.5 mm） take more than 50% of the total amount.The roots of Salix gordejevii mostly distribute in soil depth of 10～30 cm to absorb the moisture content.The weight of roots decreases with the soil depth.The roots expand horizontally and the horizontal root system develops obviously,and the characteristic presents more obviously with the plant growth.