【摘要】 沙冬青(Ammopiptanthus mongolicus)是我国荒漠特有的常绿灌木。它具有明显的旱生结构,叶片有浓密的表皮毛,角质层极厚,气孔深陷,栅栏组织发达等,因而持水力和耐热性也强。这些特征有利于适应夏季的干旱炎热和冬季的严寒。沙冬青的蒸腾强度和光合强度均很低,故生长缓慢。更多还原

【Abstract】 A.Mongolicus is endemic,evergreen plant in desert of China.It is also ancient relic species.Studies have indicated that A.mongolicus possesses very striking xeromorphic structures,for example,leaves possess dense epidermis,with thickened, and deeper and sunked stomata,and palisade tissues are well developed.Its water- holding power and heat resistance are also higher.These traits are beneficial to adapt drought,burning hot in summer and hard winter.Growth of A.mongolicus is slow because its intensity of transpiration and photosynthesis are all very low.更多还原