概述

垫状植物

长期生长在 高山寒冷地区，适应土地脊薄、雨量稀少、风大、无霜期短环境条件下的一种植物类型.常为灌木或 多年生草本.矮生茎的节间短、分枝多而密、叶排列于根旁，匍匐贴近地面生长，植物丛生呈半球状或莲座状凸起的垫状体.它们的花期短，花也镶嵌在垫状体的表面，极少伸出其外.这种垫状植物，在高寒地区的白天，吸收辐射热较地面多，而散热则较慢，体内水分蒸散也较少，植株低矮、密集而根部发达.在西伯利亚北部最大苔原区的垫状植物十分典型，如高山 葶苈等.在中国则主要分布在青藏高原高寒地区，如 祁连山海拔４００米左右的垫状 蚤缀，青藏高原上的垫状 点地梅、垫状辣豆以及 垫状驼绒藜、藏 亚菊等.Long-term growth in the cold mountain regions, to adapt to a thin ridge of land, low rainfall, wind, frost-free period of a short-environmental conditions of plant type.'ll Always be shrub or perennial herb. Dwarf section of the stem between the short, multi-branched and dense, leaves arranged on the root next to the growth of creeping close to the ground, plant plagued was raised dome-shaped or rosette-shaped body of the cushion. Their flowering period is short, cushion-shaped flowers are also mounted on the body surface, rarely out away from it. This cushion-like plants in the alpine region during the day, absorbing more radiant heat than the ground, while the cooling is slow, the body has less water evaporation, plant low, thick and well-developed roots. in the Siberian tundra areas north of the largest cushion As is typical of plants, such as the alpine Draba, etc.. in China, mainly distributed in Qinghai-Xizang Plateau alpine areas, such as the Qilian Mountains about 400 meters above sea level cushion Arenaria Qinghai-Xizang Plateau on the cushion Androsace, spicy beans, as well as cushion cushion Ceratoides, Xizang, etc. Ya-Ju.