喀喇昆仑、昆仑山地区植物中一些元素的自然含量特征

 本文论述了喀喇昆仑、昆仑山地区87种植物12个元素含量的特征。在含量水平上>10000ppm的元素有K,Ca，800—5000ppm的元素为Na、Mg,Fe、Al，10—100ppm的元素有Ba、Sr、Ti,Mn，V与Be的含量<10ppm。大多数植物Fe、V,Sr的含量高于一般的自然含量。植物中K含量的频数分布呈正态分布，其余元素的频数分布呈对数正态分布。不同植物种元素含量差异较大，Na的变异系数最大，Ca、Mg含量的变异系数最小。同种植物在不同地点元素含量有较大差异，不同植物种差异也不同。如紫花针茅(Stipa purpurea)>垫状驼绒藜(Ceratoides compacta)>鼠麴凤毛菊(Saussurea gnaphaloides)。植物中元素含量之间的相关分析表明，Fe、Al，V，Ti之间分别达极显著相关水平。用植物中12个元素的资料，对22种植物进行分类和排序，区分出Na，K型植物和Fe，Al,V,Ba型植物。

Characteristics of Element Contents in Plant Species of the Karakorum and Kunlun Mountains

We discussed the characteristics of the contents of 12 elements (K, Na, Ca,Mg, Ba, Sr, Be, Fe, V, Ti, Mn, Al) in 87 plant species collected from Karakorum and Kunlun Mountains. The average contents of K and Ca were higher than 10000 ppm; Na, Mg, Fe and Al ranged between 800 and 5000 ppm;V and Be were less than 10 ppm. The Fe, V and Be contents in the plants were higher than the average of the terrestrial plants. The K contents in different plant species showed a pattern of normal distribution. while other elements tended to represent lognormal distributions. Plant species differed greatly in the contents of the elements. indicated by using the coefficient of variation (C.V. %). Na had the highest C.V. among species. while K and Ca had the lowest. The same plant species collected from different habitats also demonstrated great difference so did the different plant species for instance, Stipa purpurea>Ceratoides compacta>Saussurea gnaphaloides. The analysis of correlations between elements in different plant species indicated that the correlations between Al and V, Fe and V, Ti and Al et al., were statistically significant. The classification and ordination of the 22 plant species using TWINSPAN and DCA methods suggest that these plant species can be classified as Na and K type plants. and Fe, V, Al and Ba type plants, respectively, based on the contents of 12 elements in the plant tissue.