杜鹃叶片气孔长度和密度对海拔变化的响应  

Variation of Stomatal Length and Stomatal Density in Leaves of Rhododendronswith Elevation

作　　者：徐浩杰[1] 杨太保[1] 曾彪[1] 

机构地区：[1]兰州大学资源环境学院,甘肃兰州730000

出　　处：《干旱区研究》2012年第6期1054-1058,共5页Arid Zone Research

基　　金：秦惠君-李政道中国大学生科研见习进修项目基金(兰州大学)资助项目;国家自然科学基金项目(40871057;40901056)

摘　　要：利用光学显微镜,研究陇西黄土高原兴隆山自然保护区2 600～3 100 m海拔带内高山杜鹃(Rhododendronlapponicum)和烈香杜鹃(Rhododendron anthopogonoides)(高山杜鹃分布在北坡,烈香杜鹃分布在南坡)叶片气孔长度和密度随海拔高度的变化情况,并通过建立大气温度、大气CO2浓度等环境因子与海拔高度之间的变化关系,探讨了杜鹃叶片气孔长度和密度随海拔高度升高而发生变化的原因。结果表明:海拔高度由低到高,高山杜鹃叶片气孔长度有减小趋势,气孔密度有显著增加趋势;烈香杜鹃叶片气孔长度随海拔高度升高先增大后减小,气孔密度先减小后增大。海拔高度的变化能够引起大气温度、大气CO2浓度和地势等的变化。高山杜鹃通过增加叶片气孔长度并减小叶片气孔密度来适应环境温度和CO2浓度的变化,烈香杜鹃则通过增加叶片气孔长度,并减小叶片气孔密度达到对环境温度、CO2浓度和土壤湿度的最大适合度。This paper investigated the stomatal length（SL） and stomatal density（SD） of Rhododendron lapponicum and R.anthopogonoides collected from different altitudes ranging from 2 600 to 3 100 m in Xinglong Mountains.The factors affecting the variations of SL and SD at different altitudes were also analyzed using the data of air temperature,CO2 concentration and terrain.The results showed that SL was decreased but SD increased significantly in leaves of R.lapponicum with the increase of altitude.SL in leaves of R.anthopogonoides was increased at first and then decreased,and SD was opposite.Air temperature and CO2 concentration were strongly affected by altitude.R.lapponicum acclimatizes mainly the change of temperature and CO2 concentration by increasing SL and decreasing SD in its leaves,while R.anthopogonoides acclimatizes mainly the change of air temperature,CO2 concentration and soil moisture content by increasing SL and decreasing SD in its leave.

关 键 词：杜鹃(Rhododendron) 气孔长度 气孔密度 海拔 气候变化 黄土高原 陇西 

分 类 号：Q945[生物学—植物学]