小五台亚高山草甸植物化学成分研究

植物化学成分与植物类群以及所处生境关系密切。对小五台亚高山草甸植物中的12种化学成分进行分析，主要结果如下：1)优势植物中，莎草科和禾本科植物的K/Ca值较高，而Ca/P值则明显低于杂类草植物，豆科植物K/Ca、K/P、Ca/P、S/P 4项指标都明显低于其他植物，由于草甸主要优势植物的Ca/P值偏高，在作为牧草利用时可考虑P的补饲；2)依据植物的9种元素含量特征对优势植物用双向指示种分析方法（TWINSPAN）分类，可较好区分出不同的植物类群；3)方差分析显示阳坡环境的群落植物中P、K含量偏低，阴坡则相反，而放牧干扰环境中，植物群落金属元素含量高；4)草甸植物的Al、Fe、Cu含量随着海拔高度增加而逐渐降低。典范对应分析（CCA）分析则显示大量元素含量高的植物多分布于阴坡生境，重金属含量高的植物主要分布于土壤水分高而土壤养分状况不佳的位置。

Analysis of chemical composition of plants in subalpine meadow on Mt. Xiaowutai

The chemical composition of plants is closely correlated to their taxa and habitat.Based on the field works and quantity analysis,the relationship between 12 minerals content of herbage plants and their taxa and habitats in the subalpine meadow of Mt.Xiaowutai were discussed.The main results are as follows: 1) Sedge and grass with higher K/Ca ratio but lower Ca/P ration compared to forbs,while legume has low ratio scores in K/Ca,K/P,Ca/P and S/P,since the main dominant plants in the meadow with higher Ca/P ...