关键词: 梭梭荒漠, 生态系统, 初级生产力, 群落结构

Abstract: Haloxylon ammodendron community is the most widely-distrituted typical type of desert vegetaion in desert area of Asia. Its main characteristics are wide ecological amplitude, abundant plant species and high primary productivity. After studying species component, community structure, seasonal aspect, weight of herb layer of community and current year green part of Haloxylon ammodendron, the following results were obtained: 1) The abundant ephemeral and annual plants in the commumty show that Haloxylon ammodendron community is a kind of transitional vegetaion type that is between the center of Asia and Central Asia. 2) Higher proportion of genera that include single or a few species reflects Halawylon ammodendron community having some characteristics of drought region's flora like Xinjiang desert flora. 3) The change in the primary production was related closely to the growth of Haloxylon ammodendron, ephemeral and annunal plants. 4) Haloxylon ammodendron grows very rapidly from June to early September. Its growth process is without obvious summer dormancy. The biomass of its currtent year green twigs occupy a dominant proportion in the total primary procuction(72.3～85.8%). 5) Because of the microrelief influences, species component and above ground biomass of the herbaceous plants were different. The biomass of herbaceous plants was highest at north slope of sand dune, lower at south slope and the land between two sand dunes, and lower at top of sand dune.

Key words: Community, Desert, Ecosystem, Haolxylon ammodendron