【摘要】 分析了乌鲁木齐河源区 35种冰缘植物 1 6个元素含量的特征。含量 >50 0 0μg/g的元素为 Ca,在 1 0 0 0～ 50 0 0 μg/g之间的元素有 K、Mg、Na、Fe,在 1 0～ 2 0 0 μg/g之间的元素有 Zn、Mn、Sr、Cr、Pb,含量 <1 0 μg/g的元素有 Cu、Ag、Co、L i、Cd、Ni。元素含量特点是 Ca>K型。大多数冰缘植物的 Fe、Sr、Mn、Cr、Cd的含量高于一般的自然含量 ,但 Cu的含量低于陆生植物必需浓度。不同的植物元素含量变异较大。高山草甸、高山垫状植被、高山流石堆植物 3个垂直分布带的冰缘植物吸收各元素含量的趋势基本一致 ,顺序为 Ca>K>Na>Mg>Fe>Mn>Zn>Sr,高山流石堆植物的 Ca、Na的平均含量明显高于高山草甸、高山垫状植被 ,而 K的平均含量低于这 2个植被带的植物 ,这 3个植被带的植物吸收各元素的含量的差异 ,反映了冰缘植物与高寒环境相适应的特征。更多还原

【Abstract】 The characteristics of the contents of 16 elements (Ca,K,Na,Mg,Fe,Mn,Zn,Cu,Co,Ni,Sr,Pb,Cd,Ag,Li,Cr) in 35 plant species in alpine periglacial environments collected from the source area of Urumqi River were investigated.The average content of Ca was higher than 5 000 μg/g,that of K,Mg,Na and Fe ranged between 1 000 and 5 000 μg/g,and that of Zn,Mn,Sr,Cr and Pb ranged between 10 and 200 μg/g,and that of Cu,Ag,Co,Li,Cd and Ni were less than 10 μg/g.The main character of the element contents was of the Ca>K type.The element contents of Fe,Sr,Mn,Cr and Cd in most plant species were higher than average natural contents and the lowest content of Cu of altifrigetic subnival vegetation was lower than that of terrestrial vegetation need.The sequence absorbing elements of alpine meadow,alpine cushion vegetation and alpine talus plant species in periglacial environments from three vertical distribution zones was consistent and that was Ca>K.Na>Mg>Fe>Mn>Zn>Sr.The element contents of Ca and Na in alpine talus plant species were higher than that of other two zones and it had lower content of K.There were greater differences in the element contents of plant species collected from different zones.The results showed that altifrigetic subnival vegetation had the characteristics to adapt to geographical environments.更多还原