民勤连古城自然保护区异质生境中沙木蓼群落结构及物种多样性  

Community Structure and Species Diversity of Atraphaxis bracteata in Minqin Liangucheng Nature Reserve

作　　者：李得禄[1] 刘世增[1] 纪永福[1] 李昌龙[1] 张芝萍[1] 唐卫东[1] 柴成武[1] 姜生秀[1] 吴昊[1] 

机构地区：[1]甘肃省风沙灾害防治重点实验室/甘肃民勤荒漠草地生态系统国家级野外观测站/甘肃省治沙研究所,甘肃兰州730070

出　　处：《西北林学院学报》2016年第5期85-89,181,共6页Journal of Northwest Forestry University

基　　金：甘肃省创新群体项目(145RJIA335);国家自然科学基金项目(3137070;31000322);甘肃省自然基金项目(1308RJYA081);甘肃省青年基金项目(145RJYA270)

摘　　要：以民勤连古城自然保护区不同生境条件下的沙木蓼群落为研究对象,分别测定各样方物种组成、沙木蓼生长特征、优势种重要值、物种多样性指数,分析各指标之间的关系。结果表明,沙木蓼群落物种稀少,组成简单,以旱生、超旱生灌木和多年生草本占主导地位,表现出明显的荒漠草原植被特征。沙木蓼群落以旱生灌木层为优势层片,多年生草本层数量次之,1年生草本数量最少,群落稳定性主要由灌木层和多年生草本层决定。群落所处生境决定了群落重要值、生长量指标以及多样性指数。生境类型Ⅲ中沙木蓼生长量最大,表明该生境是适宜沙木蓼生长的生境类型,而生境Ⅱ中的群落多样性指数、均匀度指数为最高,群落优势度较低,表明该生境是适宜群落中大部分植物生长的生境类型。生境类型Ⅰ和生境类型Ⅲ相似,在群落特征上也表现出一定的相似性。The community structure and species diversity of Atraphaxis bracteata community in heterogeneous environment,located in Minqin Liangucheng National Nature Reserve,were studied by the sample-plot survey method. The results showed that the vegetative composition was simple and dominated by xeric, and hyper-xeric small shrubs and perennial herbage plants,which represented the characteristics of desertification steppe vegetative community,the herbage layer took the second place,and the quantity of annul herb- age was the least. The stability of community was determined by shrub layer and perennial herbs. The im- portance value, growth indexes and diversity index were determined by the habitat of their living environments. The growth of habitat Ⅲ was the highest,indicating that this habitat was suitable for the growth A. bracteata,but the diversity index and the evenness index of habitat Ⅱ were the highest, and ecological dominance was lower,that showed habitat Ⅱ was suitable for the growth of most species. And community characteristics exhibited a similar characteristic between habitat I and habitat Ⅲ.

关 键 词：民勤连古城自然保护区 沙木蓼 群落结构 物种多样性 

分 类 号：S718.542[农业科学—林学]