民勤霸王群落结构和物种多样性特征研究

Community Structure Characteristic and Species Diversity of Zygophyllum xanthoxylum in Minqin

研究民勤霸王群落物种多样性对霸王资源的合理保护与利用具有重要意义。在民勤不同霸王分布区,采用样方调查法,对霸王群落结构和物种多样性特征进行了分析。结果表明:(1)民勤霸王草地群落结构简单,物种相对单一,所调查群落中共有植物种39种,分属13科32属;单科单属种较多,占到了总科数的一半;(2)在砂砾质地上,霸王种群密度大,物种相对丰富,但是生长量较小,而在固定半固定沙丘则相反。霸王群落所处生境影响了霸王的密度及生长;(3)在砾质地上生长的霸王群落物种相对丰富,多样性指数高,群落稳定性好,群落优势度较低,而在固定半固定沙丘上生长的霸王群落组成物种单一,结构简单,多样性指数较低,生态优势度较高,群落稳定性较差。

Studying the Zygophyllum xanthoxylum species diversity have great significance for reasonable protection and utilization of Zygophyllum xanthoxylum sources in Minqin.The community structure and diversity characteristics of Zygophyllum xanthoxylum community was researched by using quadrat investigation in different distribution areas in Minqin,the results show that：（1） Zygophyllum xanthoxylum community structure is simple and species is monotonous.There are 39 kinds of species belonging to 12 families and 31 genera.There are more single genus that contribute 50 percent of total genus;（2） Population density of Zygophyllum xanthoxylum is higher in sand gravel field,but growth is smaller.Fixed and semi-fixed sand is opposite.Growth and density of Zygophyllum xanthoxylum was influenced by habitat.（3） Species is rich relatively,species diversity index is higher,community stability is well,community dominance index is lower in sand gravel field,but community composition of fixed and semi-fixed sand is single,structure is simple,species diversity index is lower,ecological dominance is higher,and community stability is poorer.