黄土高原地区种子植物区系中的珍稀濒危植物研究

黄土高原地区植物区系是南北和东西区系成分的交汇 ,也是旱生、中生和湿生植物聚集的地区 ,生长着比较丰富的植物种类 ,有种子植物 32 2 4种 ,其中珍稀濒危植物 78种 ,分别隶属于 4 3科 6 6属 ,国家一类保护植物 2种 ,国家二类保护植物 10种 ,国家三类保护植物 15种 .地理成分分析表明 ,在属一级水平上以北温带成分、中国特有成分、东亚成分为主 ,种一级水平上以华北区系成分为主 .另外 ,在分析黄土高原珍稀濒危植物致濒机制的基础上 ,进一步提出了保护对策

Research of rare and endangered plants of seed plant flora in Loess PlateAu

The flora of plants in Loess Plateau is the crisscrossing and assembling area of flora from north to south and from west to east, and the assembling area of xerophyte, mesophyte and hygrophyte. Here grow various seed plants, a total of 3 224 species of the seed plants. Among them, there are 78 rare and endangered species belonging to 66 genera, 43 families. The geographical compositions of the rare and endangered plants are studied. The result shows that the north temperate element, China endemic element and East Asia element are the major geographical compositions at genus level. The geographical compositions of species takes North China as the dominant element. In addition, aside from analysis of reasons in endangering plants in Loess Plateau,some strategies for protection are put forward.