Most perennial grasses in arid and sandy habitats possess cylindrical rhizosheath encasing their roots, a physiological mechanism by which the plants adapt to drought stress.

• 摘要生长在干旱、沙化地区的禾本科植物的根系通常都具有沙套结构，沙套的形成是植物对干旱逆境环境的生理适应机制。