内蒙古温带典型草原羊草与大针茅群落结构特征比较

于2006年植物生长盛期(7~9月)在中国科学院草原生态系统定位站对典型草原的代表类型羊草(Leymus chinensis)和大针茅(Sti-pa grandis)群落结构和生物量进行了观测和定量分析。结果表明,羊草群落丰富度略高于大针茅群落。按重要值排序,羊草群落位居前6位的分别是黄囊苔草(Caldesia korshinskii)、羊草、西伯利亚羽茅(Achnatherum sibiricum)、米氏冰草(Agropyron michaoi)、大针茅和糙隐子草(Cleistogenes squarrosa),6种的重要值总和为80.56%;大针茅群落重要值位居前6种的植物种类为大针茅、刺藜(Chenopodium aristatum Linn.)、羊草、黄囊苔草、糙隐子草、米氏冰草,总和达75.28%。大针茅群落较羊草群落更适应干旱气候条件。羊草群落和大针茅群落总生物量分别达到845.8和656.5 g/m2,羊草群落显著高于大针茅群落(P<0.01),生物量变化趋势基本一致,两群落能迅速对干旱低温做出反应。

Comparison of Community Structure between Leymus chinensis and Stipa grandis at Classic Inner Mongolia Variable Zone Glassland

Community structure and biomass of Leymus chinensis community and Stipa grandis community were surveyed and quantitatively analyzed at inner Mongolia grassland ecosystem research station of the Chinese academy of sciences in 2006 growth period.The result indicated that the community richness of L.chinensis was slightly higher than that of S.grandis.Ordered by important value,the species which ranked top 6 were Caldesia korshinskii,Leymus chinensis,Achnatherum sibiricum,Agropyron michaoi,Stipa grandis and Cleistogenes squarrosa in L.chinensis community,and the sum of their important value was 80.56%.Species which ranked top 6 were Stipa grandis,Chenopodium aristatum Linn.,Leymus chinensis,Caldesia korshinskii,Cleistogenes squarrosa and Agropyron michaoi in S.grandis community,and sum of their important value was 75.28%.In dry climate condition,S.grandis community was more suitable than L.chinensis.Total biomass of L.chinensis was 845.8 g/m2,and was significantly higher than that of S.grandis(656.5 g/m2).Change of both biomass was similar on the whole,and two communities could rapidly react on drought and low temperature.