吉林省羊草草原内亚气生藻类的分布规律

The distribution regularity of subaerial algae in Leymus chinensis steppe from Jilin Province

在草原生态系统内,亚气生藻类是常见且重要的组分之一.亚气生藻类在羊草草原内的分布规律与羊草草原的植物群落类型、自然地理状况,尤其是草原受到的干扰强度有直接关系.研究结果表明:在保护状态下的割草草场分布有较多的亚气生藻类(28种),其次是火烧草场,而重牧状态下的草场亚气生藻类的种类最少,只有10种.亚气生藻类在草原中生长时往往形成藻类结皮,藻类结皮的存在对土壤温度、土壤的含N量、土壤的保水性等都有一定的影响.

In grassland ecosystem, subaerial algae is a common and important component, its distribution regularity in Leymus chinensis steppe has direct relations with plant community type and especially the interference tensity in Leymus chinensis steppe. It was found out from our research that: there are more subaerial algae in hayland that is under protective condition (28 species) ; less species in pyric grassland; while least species of algae distributed in heavy grazing grassland (10 species) . The vegetation of subaerial algae in grassland usually combine as algal crust, and the presence of algal crust have somewhat influence on soil temperature, soil nitrogen content and soil water-holding power etc.