Allelopathy effect of common herbs and shrubs under forest on physiological activities of Pinus massoniana seedlings.

The allelopathy effects of the common herbs and shrubs(donor plants) under forest on the physiological activities of Pinus massoniana seedlings(receptor plants) were studied by means of biological identification of the litter extract solution.The results showed that chlorophyll content and cell membrane permeability of the receptor plant were generally increased with different treatments of the two donor plants,but the photosynthetic rate and transpiration rate of the receptor plants were basically reduced with the same treatments.The nitrogen absorption of P.massoniana seedlings was slightly inhibited by herbaceous plants′ solution and by lower concentration of shrub plants′ solution,while it was promoted by high concentration of shrub plants′ solution.And the allelopathy effect of the donor plants on phosphorus absorption of the P.massoniana seedlings was in the opposite trend.Both the donor plants solutions had promotion effect on potassium absorption of P.massoniana seedlings.