干旱区生态环境知识资源中心

At desert regions in arid area, the spatial distribution characteristics of Agriophyllum squarrosum at the different habitat condition were studied, and the reasons for distribution characteristics were also analyzed by field investigation and controlling trial. Results showed that A.squarrosum adapted easily to the mobile and semi-mobile sand dune. At the process of sand dune fixation (restoration of sandy land), the number of A.squarrosum population decreased gradually, and there were no A.squarrosum occurred at the fixed sand dune; at a mobile sand dune, A.squarrosum population distributed in patch, and mainly distributed at the two sides of sand dune, base and centre of windward slope. In the different desert vegetation, if there were bare patches of sand soil, there was A. squarrosum. A. squarrosum population at the different sand dune, the different positions of the mobile sand dune and the different vegetation communities were clumped distribution. The spatial distribution characteristics of A.squarrosum population were affected by biological and environmental factors. The biological factors included that the germination of A.squarrosum was suitable in darkness which was brought by sand burial, the soil seeds of A.squarrosum distributed at the topsoil layer of 0-5cm and decreased gradually in the restoration process sandy land, and A.squarrosum was easy to develop sand tongue which had the role of accumulating seeds. Those results proved that A.squarrosum was a typical psammophyte.