Abstract: In this study, some seed collectors were distributed to collect seeds of [WTBX]Stipagrostis pennata,[WTBZ] and the collected seeds were divided into several groups based on their temporal and spatial differences so as to analyze the characteristics of seed dispersal and seed rain of [WTBX]S. pennata[WTBZ] in the Gurbantonggut Desert. The results are as follows: ① The average accumulated density of seed rain of [WTBX]S. pennata[WTBZ] was as high as 3 766.30 seeds under each plant, in which the proportion of full seeds accounted for 19.56%; ② The peak of seed dispersal occurred from June 25 to July 15, the proportion of falling seeds during this period was 61.96% of the whole seed rain, and the seed rain density was decreased gradually with the time; ③ There was no significant difference of seed rain density among the different habitats; ④ There was a significant difference of seed rain amount among the different ages of [WTBX]S. pennata[WTBZ] plants; ⑤ Seeds fell intensively within a 4m extent downwind and 1m extent around the plants at the early stage of seed dispersal of seed rain. In the southern marginal zone of the Gurbantonggut Desert, the quality of seed rain was low, but the density was high and of a certain significance to the natural regeneration of the population.  

Key words: font-size: 10.5pt, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, Stipagrostis pennata')">mso-bidi-language: AR-SA" lang="EN-US">Stipagrostis pennata, seed rain density, spatial distribution, habitat, Gurbantonggut Desert