| The Rhus typhina L.is often used as an ornamental tree in urban greening because of its excellent biological characteristics and high ornamental value.The tiller propagation and adaptability of R.typhina are strong,which can affect the diversity of plants as other plants can barely grow healthily in the forests,thus R.typhina would become a superior species and invasive species.Therefore,people pay much attention to its characteristics.We studied the effects of water leaching solution from R.typhina leaves,roots and ear corn on seed germination and seedling growth of 4 kinds of composite plants,including Cosmos bipinnata Cav.,Tageteserecta L.,Zinnia elegans Jacp.and Rudbeckia hirta L.The allelopathy mechanism of R.typhina on composite plants was discussed,which has provided a theoretical basis for reasonable combination of R.typhina and other plants.The main results are as followed:1.R.typhina leaves,roots and ear corn water leaching solution can accelerate stem growth of receiver plants,especially for Rudbeckia hirta L.The length of stem increased 79.31% under the treatment of 0.025 g/mL water leaching solution.While in a high concentration,it became an inhibitory action.The water extraction from the leaves,roots and ear corn of R.typhina have an inhibitory action on the germination rate,germination index and root length of those four receive plants.And there were the largest effect under the concentration of 0.2 g /mL of water leaching solution.2.The effects of water leaching solution from R.typhina leaves,roots and ear corn on different osmotic regulatory substances of receiver plants are different.Under the treatment of 0.025 g /mL leaf and root water extraction solution,it had a small promoting effect on the soluble protein content of Zinnia elegans Jacp.and a small inhibiting effect on the soluble protein content of Cosmos bipinnata Cav.,Tagetes erecta L.and Rudbeckia hirta L.The content of malonaldehyde(MDA)in the receiver plant seedlings gradually increased with the increase of the water extract concentration in all parts.The total content of chlorophyll decreased with the increase of the concentration of water leaching solution.3.The effect changing trends of R.Typhina leaves,roots and ear corn water leaching solution on receiver plant antioxidant enzyme activity are similar: there were promoting effects on the Cosmos bipinnata Cav.SOD and POD with the concentration of 0 g/mL-0.025 g/mL,and it turned to inhibiting effects with the concentration of 0.025 g/mL-0.2 g/mL.Meanwhile,At the concentration of 0 g/ml-0.05 g/mL,the SOD and POD of Tagetes erecta L.,Zinnia elegans Jacq.and Rudbeckia hirta L.were promoted,the effect turned to inhibiting when the concentration was 0.05 g/mL-0.2 g/mL.4.The leaves of R.Typhina had different effects on the early growth stages of Cosmos bipinnata Cav.,Tagetes erecta L.and Zinnia elegans Jacq.,and had inhibitory effects on plant height,stem thickness,biomass and total chlorophyll content;The MDA content was first increased and then decreased;In addition to 15 d treatment,within the range of 0.1 g/ml-0.2g /mL concentration,the effect of soluble protein on the promotion of Cosmos bipinnata Cav.was inhibited at all concentrations within 30 d-60 d.R.Typhina in leaves,roots and average water leaching solution of 4 kinds of compositae plants sense on the strength of different order: root > leaf > ear corn,R.Typhina forests suitable match with Rudbeckia hirta L.the Cosmos bipinnata Cav.,Tagetes erecta L.and Zinnia elegans Jacq.is not obvious,the influence of the one hundred days.Its allelopathy has "time effect" and "concentration effect",It will have an inhibition effects at the beginning of growing in a certain extent,while with the time for them to match with each other,the inhibition effects will not obvious or tend to be stable. |
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