刺槐·木荷水浸液对马尾松幼苗生长的化感效应

目的]为营造马尾松混交林提供理论依据。方法]用供体刺槐和木荷枯落物的浸提液处理受体马尾松幼苗,研究不同浓度的两种供体水浸液对马尾松幼苗生长的化感效应。结果]刺槐水浸液对受体的苗木地径、苗高生长都表现出不同程度的促进作用,且随着生长期的延长促进作用增强;木荷水浸液对受体幼苗生长的化感效应不明显。木荷对受体幼苗的主根生长表现为低促高抑,刺槐对受体幼苗的主根生长表现出促进作用,随浓度的升高促进作用逐渐减弱,两种供体浓度间差异都不显著。供体刺槐和木荷对受体幼苗的地上部和地下部鲜重均表现出不同程度的促进效应,其中刺槐的促进效应最明显。结论]刺槐的水浸液对马尾松幼苗生长的促进效应显著,可以作为马尾松的伴生树种。

Allelopathic Effects of Aqueous Infusion of Robinia pseudoacacia and Schima superba on the Growth of Pinus massoniana Seedling

Objective] The research aimed to provide theoretical basis for constructing the mixed forest of Pinus massoniana. Method] Receptors P. massoniana seedlings were treated with the leached solution of the litters of donors Robinia pseudoacacia and Schima superba to study the allelopathic effects of 2 kinds of water infusion with different concentrations on the growth of P. massonian seedlings. Result] The aqueous influsion of R. pseudoacacia had promoting effects to different degrees on the seedling ground diameter and the seedling height growth of receptors and the promoting effect was strengthened with the prolonging of the growth stage. The allelopathic effects of the aqueous influsion of S. superba on the seedling growth of receptor were not obvious. S. superba showed promotion at low concentration and inhibition at high concentration on the growth of main roots in the seedlings of receptors while R. pseudoacacia showed a promoting effect on the growth of main roots in the seedlings of receptors and the promoting effect was gradually weakened with the increasing of the concentration. The differences between 2 donors were not significantly. Donors R. pseudoacacia and S. superba both showed promoting effects to different degrees on the fresh weight of the overground parts and the downground parts in the seedlings of receptors, among which the promoting effect of R. pseudoacacia was most obvious. Conclusion] The aqueous influsion of R. pseudoacacia had a significant promoting effect on the growth of P. massoniana seedlings and it could be taken as associated tree specie with P. massoniana.