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

LI De-lu;LIU Shi-zeng;JI Yong-fu;LI Chang-long;ZHANG Zhi-ping;TANG Wei-dong;CHAI Cheng-wu;JIANG Sheng-xiu;WU Hao;State Key Laboratory of Desertification and Aeolian Sand Disaster Combating & Minqin National Studies Station for Desert Steppe Ecosystem & Gansu Desert Control Research Institute;

Minqin Liangucheng National Nature Reserve;;Atraphaxis bracteata;;community structure;;species diversity

The community structure and species diversity of Atraphaxis bracteatacommunity 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 herbage was the least.The stability of community was determined by shrub layer and perennial herbs.The importance value,growth indexes and diversity index were determined by the habitat of their living environments.The growth of habitatⅢ was the highest,indicating that this habitat was suitable for the growth A.bracteata,but the diversity index and the evenness index of habitatⅡwere the highest,and ecological dominance was lower,that showed habitatⅡ was suitable for the growth of most species.And community characteristics exhibited a similar characteristic between habitatⅠ and habitatⅢ.