Abstract: The study on the biomass allocation and stoichiometric ratio of desert plants in different growth periods can help to understand the functional structure of desert plants and better grasp the influence of environment on the survival of plants. In this study, four annual desert herbs Agriophyllum sqarrosum(L.) Moq., Bassssia dasyphylla(Fisch. Et Mey.) O.Kuntze, Ceratocarpus arenarius L. and Suaeda glauca(Bge.) Bge. were selected. The changes of the distribution of biomass, N and P stoichiometry with plant growth were compared. The results showed that:(1)During the process of biomass accumulation and distribution of four kinds of desert plants, the root crown ratio decreased gradually with the extension of growing season. The growth relation of aboveground and aboveground biomass showed that the change process of the quinoa was isokinetic to isokinetic, while the change process from the initial stage to the final stage of the sample was isokinetic to isokinetic, while the correlation growth index of the apsarum and the apsarum was opposite, which was the change pattern of isokinetic to isokinetic, isokinetic to isokinetic to isokinetic. (2)The N and P contents of the four plants decreased gradually with the extension of growth period.The variation trend of N and P content of the four plants was similar throughout the growing season. (3)The contents of plant N and P reached a significant positive correlation, and the other indexes except N:P of desiccant and fog ice quinoa showed a significant negative correlation with the aboveground and underground biomass and total biomass of plants, while the root crown ratio, correlation growth index and stoichiometric characteristics did not reach a significant level, indicating a relatively weak correlation between them.Study shows that the four kinds of desert plant biomass little correlation with characteristics of chemical measurement and explain stoichiometric ratio is not the main factors influencing the plant biomass and life strategy, but more is affected by the plant's own genetic traits, but also embodies the desert herbaceous plants under the condition of lack of nutrients, formed its own unique physiological and ecological characteristics, and has a relatively stable adaptive traits. Research shows, There was little correlation between biomass and stoichiometric characteristics of the four desert herbaceous plants, indicating that stoichiometric ratio was not the main factor affecting biomass and living strategies of plants, but was more influenced by the genetic characteristics of plants themselves. At the same time, it also reflects that desert herbaceous plants have formed their own unique physiological and ecological characteristics under the condition of nutrient deficiency, and have relatively stable adaptation characteristics.

Key words: eremophytes, biomass, ecological stoichiometry, allometric relationship, Gurbantunggut desert