| Rhus typhina is a kind of fine tree species for scenic forest construction, landscaping and slope protections, it has the basic features of invasive plants because of its super root tillers ability to reproduce and stress resistance. The horizontal distribution regularity of lateral root of adventitious bud of Rhus typhina was studied by digging the root field investigation, the occurrence characteristics of adventitious bud was studed through conventional paraffin section method and the development of root sprout plant was observed and analyzed in phenology.The survival competition relations between the exotic species and local common tree species was studed through the planting of Rhus typhina singlely and mixed with Syringa oblate Lindl. under the condition of different gradient nitrogen fertilizer. Some traits were surveyed such as plant height, ground diameter, leaf area, maximum photosynthetic rate, chlorophyll content etc. Germination rate, germination energy, germination index and the allelopathic effect of sensitive index of seeds of Medicago sativa L., Trrifolium repens L. Brassica campestris L., Lactuca saliva, Zea mays L. and Glycine max L. were studied by soaked in the leach liquor of his fresh leaves and mature grain of Rhus typhina L., due to probe the allelopathy to the local common plants. The results of the study were as follows:(1) Rhus typhina’s root system distribution was shallow, the horizontal lateral root distribute within 15 cm below the surface, there were most buds on the lateral roots in 2-5 cm soil layer. Adventitious buds germinated throughout the whole growing season, especially the number is largest in spring.It was shown that adventitious buds originated from the horizontal lateral root of pericycle cells by Morphology anatomy, so Rhus typhina is a kind of root clonal plants. The formation of root suckers is earlier than stock plants and the other trees overground. The full light in the stand made root suckers grow rapidly, which enhanced their competition and created the conditions for their population expansion and promoting invasion.(2) Rhus typhina have a certain influence on the growth of Syringa oblate. The competion of Rhus typhina planted with local species was stronger than that planted singly under the condition of low level of soil nutrients. Rhus typhina can adapt to different environmental conditions to promote its growth by the utilization of the resource acquisition and the allocation of nutrition. Rhus typhina affected the growth of other plants mainly because there were developed horizontal lateral roots on which many root suckers occurred, which expanded the living space, enhancd the acquisition of resources, and improved the competion.(3) The leach liquor of fresh leaves and fruits of Rhus typhina had allelopathic inhibition effect on six kinds of plants and different plants were sensitive differently to the same allelopathy. It were observed that the fruits allelopathy was stronger than that of leaves by the influence degree of the water extraction liquid for germination rate, germination rate decline tendency and comparison of significant difference. Allelopathic inhibition effect of the leach liquor of fresh leaves on the six kinds of plants is Lactuca saliva, Glycine max, Trrifolium repens, Medicago sativa, Zea mays, Brassica campestris from strong to weak in order. The allelopathic inhibition effect of fruits water extraction on six kinds of plant is Medicago sativa, Lactuca saliva, Brassica campestris, Zea mays, Trrifolium repens, Glycine max. from strong to weak in order. |
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