【作者】 徐军；

【导师】 李青丰； 王建光；

【作者基本信息】 内蒙古农业大学 ， 草业科学， 2003， 硕士

【摘要】 通过对沙坡头人工固沙植被区主要建植种群柠条(Caragana korshinskii)、花棒(Hedysarum scoparium)和油蒿(Artemisia ordosica)的繁殖特性及种群结构的研究，以及自然侵入的一年生草本植物小画眉草(Eragrostis poaeoides)和雾冰藜(Bassia dasyphylla)繁殖特性的研究，探讨了在植被的持久性和变异性，分析评价了主要受恶劣环境压力下的人工固沙区植被的稳定性。结果表明：①在地处干旱半干旱的沙坡头地区，通过机械固沙与植物固沙相结合的防风治沙模式，建立的雨育人工固沙区植被经过多年演替形成的人工—天然植被是稳定的。②植物的繁殖特性对植被(或群落)的稳定性起基础性作用，只有能通过无性或有性繁殖实现种群更新的植被(或群落)，才能长久稳定存在，是植被(群落)稳定的深层次的机制。③柠条和花棒以成株高抗旱性和长寿命来适应沙区的环境。油蒿、小画眉草和雾冰藜等植物则是通过种子萌发和幼苗存活对干旱区降雨的特殊适应，更新和维持一定种群，形成与生境条件协调、稳定的植物群落。④沙坡头人工固沙区植被随时间推进，老固沙区中的柠条种群将在50年或稍长的时间内消失，形成以油蒿种群为主，花棒种群为辅的多年生群落。其将与因年际间降水量及其分布差异引起的种群密度等特征波动的一年生草本小画眉草和雾冰藜种群长期共存。更多还原

【Abstract】 The reproductive characteristics and population structure of Artemisia ordosica, Hedysantm scoparium, Caragana korshinskii and the reproductive characteristics of annual plants Eragrostis poaeoides and Bassia dasyphylla were observed in Shapotou artificial revegetation area. Stability of the artificial vegetation was appraised from the views of its persistence and variability under local natural condition. The study showed that: ① the artificial -natural vegetation built with sandbreaks and plants is stable in Shapotou area. ② The reproductive strategy of plants in Shapotou played an essential role for vegetation stability.③ High resistance to drought and long life span enableed Hedysarum scoparium and Caragana korshinski to adapt themselves to the harsh environments. Special seed germination and seedling survival mechanism in Artemisia ordosica, Eragrostis poaeoides and Bassia dasyphylla ensured the maintenance and replacement of their populations in accordance with local environmental conditions.④ At old artificial vegetation of Shapotou area, C. korshinskii is expected to disappear in the future of 50 years or so. The perennial vegetation is expected to A. ordosica dominated and H. scoparium stably co-existed, together with an annual plant population of E. poaeoides and B. dasyphylla, which is greatly fluctuated with annual precipitation pattern.更多还原