Abstract: 【Objective】To provide technical support for the large-scale,industrialized development of cultivated Puionium dolabratum.【Methods】Under artificial cultivation conditions,the growth law of Puionium dolabratum was studied by evaluating the growth,biomass,and distribution of the leaves and roots.【Results】The growth of the leaves and horizontal roots of Puionium dolabratum corresponded with exponential function,while the vertical roots was polynomially. The rapid growth of vertical roots in the early stage was beneficial to seedling preservation and stress resistance. The horizontal roots adapted to the dry and arid climate by expanding the soil water absorption area. Leaf biomass,total root biomass,horizontal root biomass,and vertical root biomass all increased exponentially,but the growth mechanism was different. Leaf biomass mostly increased when the number of leaves increases. Vertical root biomass was underdeveloped,and mostly increased by lateral root diameter expansion. The horizontal roots was highly developed,and the biomass of horizontal roots increased by horizontal root development. The difference in biomass growth was statistically significant（P<0.05）,with leaves and horizontal roots having the highest biomass growth,followed by total roots and vertical roots. In the growth process of Puionium dolabratum,leaf biomass had an absolute advantage（70%-90%）and exhibited a gradually growing trend,while the distribution of total root biomass showed a gradually decreasing trend. Both vertical and horizontal roots showed a declining trend in root biomass distribution,and the biomass distribution difference between them gradually narrowed.【Conclusion】The leaf,horizontal root,and biomass of cultivated Puionium dolabratum corresponded with exponential function. It was ideal for propagating in arid desert areas because of its fast growth rate,high yield,and strong stress resistance.

Key words: Puionium dolabratum, Growth, Biomass, Dynamic law, Artificial cultivation