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.