| Zoysia japonica Steud. is a clonal plant with unique morphological structure. It possesses strong capacity of propagation and wide adaptation amplitude, thus it has been extensively used in gardening. Zoysia japonica is also a good forage grass with high nutrient and high palatability. The ecological study on Zoysia japonica is of significance for the better exploitation and utilization of this grass resource.Nitrogen as an essential element for the growth of plant, plays important roles in the growth and development of the clonal plant, Zoysia japonica. This paper studied the characteristics and plasticity of the growth and development of Zoysia japonica plants in the environments of greenhouse and outdoors. Applying the technique of stable isotope, through introducing labeled nitrogen with different forms and concentrations into the plant from the roots of ramets with different developmental stages, the translocation patterns, intensities, direction, domains and mechanism of nitrogen in the different organs of ramets of the primary and secondary stolons were detected. The main results are as follows:1. Environmental conditions had obvious impacts on the growth of Zoysia japonica clones. The stolons in the greenhouse grew linearly at the speed of 3.2 days per multiple-node. The integrated structure of the multiple-node was completed as the roots occurred regularly. The root, tiller A and tiller B usually formed 2.9, 5.5 and 10.3 days after the corresponding multiple-node were formed, respectively. The stolons outdoors also grew linearly at the speed of 2.7 days per multiple-node. The root, tiller A and tiller B usually formed 2.6, 5.0 and 6.9 days after the corresponding multiple-node were formed, respectively. In both environments, Tb developed into stolon slowly than Ta. The stolons in greenhouse usually grew 3.3cm per day, while those outdoors 3.0cm.2. Compared to the Zoysia japonica grown outdoors, those in greenhouse had longer...
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