In terms of species composition, annual herbaceous plant is dominant in March and the seeds of Populus euphratica Oliv and Tamarix L almost appear in August.

• (2)从物种组成上看，3月份物种组成以一年生草本占优势，而胡杨和柽柳的种子基本上都出现在8月份的土壤种子库中；