<正>对岩质海岸防护林主要造林树种根系强化土壤抗冲性进行研究 ,发现根径在 0 .5mm以下和 0 .5～ 1mm的细根对土壤抗冲性的强化效应显著 ,原因在于数量庞大的细根系直接网络土体、活跃细根系的死亡分解及根系分泌物对土壤结构的间接改良作用。当根径不小于1mm径级的细根在原有基础上每 1 0 0 0cm3土增加 1 0 0 g根量 ,树木根系对土壤抗冲性强化值将分别增加 2 1 .45(湿地松 )、1 2 .2 0 (马尾松 )、2 8.99(日本扁柏 )和 1 1 .34(毛竹 )。

Influence of tree root system on soil anti scourability improvement was studied in the bedrock coast of Zhejiang province. The results shows that root system can intensify soil anti-scourability by the action of fine roots (≤0.5 mm and 0.5～1.0 mm).The fine roots can increase soil anti scourabiliy not only by the direct consolidation of the large amount of root net, but also by the indirect improving action on soil structure after roots discomposed. The regression models of tree roots and the intensified value of soil anti-scourability had been made in this paper.