The mean element concentration of 37 plant species followed an order as Na>K>Ca>P>S>Al>Fe>Mn in Alashan region, Nei Mongol. The greatest variation was found in Na concentration among species with variation coefficient of 1.378. Kalidium spp. plants had the highest Na concentration, while Stipa glareosa Smirn. and Cleistogenes songorica (Roshev.) Ohwi had the lowest among the species studied. The intraspecific variation coefficient was less than the interspecific variation coefficient of most elements in the same species at different sites, although the reverse was seen in a few species. Variance of concentration ratios, viz K to Ca, K to P and Ca to P was minimally, while that Na to K, Na to Ca, Na to S and S to P was greater, and the ratios of desert plant were minimal, and those of salt desert plants were maximal. The correlation analysis of element concentration in plant revealed that Fe and Al, Na and ash, and S and ash correlated at the level of 0.001, Na and S correlated at the level of 0.05. The results of clustering and ordination of 8 element concentration in 37 species showed that quantitative analyse methods can distinguish the characteristics of elements concentration in different plant families and show the characteristics of their ecological groups.
内蒙古阿拉善地区植物元素含量特征及数量分析
孔令韶 王其兵 郭 柯
（中国科学院植物研究所植被数量生态学开放实验室，北京1000093）
摘要: 阿拉善地区37种植物的元素平均含量为Na>K>Ca>P<Al>Fe>Mn。Na含量种间异最大，变异系数为1．378；几种盐爪爪（Kalidium spp.)的含量最高，沙生针茅（Stipa glareosa Smin.)、无芒隐子草（Cleistogenes songorica (Roshev.)Ohwi)等含量最低。同一种植物在不同地点，大多数元素含量内变异系数小于种间变异系数，个别植物的某一元素，大于种间变异系数；Na、S含量的种内变异系数均大大小于种间。植物中K与Ca、P、Ca与P的比值变化最小，而Na与K、Ca、S和S、P的比值变化较大，其中荒漠植物比值最小，盐生荒漠植物比值最大。植物中元素含量之间相关分析表明，Fe、Al之间在0．001水平上相关，Na、S之间在0．05水平上相关，植物中Na、S含量与植物灰分含量之间在0．001水平上相关。利用植物中8种元素含量对37种植物进行分类和排序，结果表明，用数量分析的方法很好地划分出植物种的科属类群的元素含量特征，并显示出它们的生态类群特征。
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