lichen crust

基本解释

The crust type along the sampling line are algae, lichen and moss, respectively, which are consistent with soil nutrient and disturbance number.
随公路里程增加，生物结皮呈现从地衣苔藓藻类地衣地衣苔藓的过渡，这与土壤养分条件和干扰因子数相对应。
Under the same destruction percentage moss crust has the highest threshold velocity, followed by lichen crust, algal and algal-lichen crusts in succession.
相同破损率条件下，起动风速以苔藓结皮最大、地衣结皮次之、藻结皮和藻类地衣结皮最小。

The changes in the weather create a crust of hard ice over the lichen, preventing the reindeer from eating.
UNESCO: On the frontlines of climate change: Sami reindeer herders