发菜生存与生长分布的微生态环境

Micro-ecological Environment of Existenceand Growth Distribution of Nostoc flagellifome

通过野外调查 ,研究和分析了对发菜生存与生长发育起直接作用的微土壤、微气候、微地形、微植被和风向等微生态环境。发菜对生存环境的选择性很强。其中 ,干一湿交替的微气候环境是一个起决定作用的关键性因子 ,是发菜生存和生长发育的必要条件。一方面 ,发菜藻体在干燥的状态下 ,有利于干物质的积累 ,是发菜生存和生长的必要前提 ;另一方面 ,发菜藻体只有在一定湿润状态下 ,才能生长发育。由于干旱气候环境所限 ,野生发菜的生长速度极为缓慢。

Through field survey, the micro-ecological environments, such as the micro-soil, micro-climate, micro-landform, micro-vegetation and wind deirection, which directly affect the existence and growth of Nostoc flagelliforme, are researched and analyzed in this article. Notoc flgellifrme is of the strong selection to the survival environment. The microclimate environment of dry and humid change is a key ractor and a necessary condition for the existence and growth of Nostoc flagelliforme. In one aspect, it's favorable to the accumulation of dry materials of Nostoc flagelliforme alage in dry condition which is the essential prerequisite for its existence and growth. In another aspect, Nostoc flagelliforme algae can grow well only under the given humid condition. Limited by the arid climate, the growth of wild Nostoc flagelliforme is extremely slow.