甘肃民勤西沙窝唐古特白刺群落的生态特性

对甘肃民勤西沙窝唐古特白刺 (NitrariatangotorumBobr.)群落的物种组成、种间关系、垂直结构、周期性和物种多样性的研究结果表明 :该唐古特白刺群落由 34种植物组成 ,隶属 11科 31属 ,属的分布类型以地中海、西亚至中亚成分为主 ;灌木层平均高 0 .43m ,包括高位芽和地上芽 2种生活型层片 ,根系多分布至 1.5m以下的土层中 ,根幅 >2m× 2m ;草本层平均高 0 .0 9m ,包括地面芽、地下芽和一年生植物 3个生活型层片 ,根系多分布于 0～ 1.5m以内的土层中 ,层片丰富 ,层片结构简单 ;群落周期性变化明显。微型叶植物占总种数的 5 0 .0 0 %,小型叶占2 3.5 3%,鳞型叶占 14.71%,中型叶占 11.76 %,无大型叶和巨型叶 ;种间关系单纯 ,种群呈聚集型分布格局 ;演替处于进展与逆行演替的阈上 ,非常脆弱和不稳定 ,必须科学地保护。

Ecological characteristics of Nitraria tangotorum community in Xishawo, Minqin of Gansu Province

The constituent, interspecific relationship, vertical structure, aspect and diversity of Nitraria tangotorum Bobr. community in Xishawo, Minqin of Gansu Province are reported. There are 34 plant species, be subordinate to 11 families 31 genera. The majority of genus distribution pattern are Mediterranea, E. Asia to C. Asia elements. The average hight of bush layer is 0.43 m and it consists of the phaenerophytes and the chamaephytes synusia, its root system distributes under 1.5 m soil layer. The average hight of herb layer is 0.09 m and it includes three life-form synusia which are the hemicryptophyte, the geophytes, and the therophytes synusia, its root system distributes in 0-1.5 m soil layer. The aspect of this community changes are obvious. The percentage of life-size are mesophyll 11.76%, microphyll 23.53%, nanophyll 50.00%, leptophyll 14.17% and no megaphyll and macrophyll. The interspecific relationship is simple, spatail distribution patterns of the populations are of aggregated type. The community succession is among contrary and progressive succession and not stability. This community must be scientific conservation.