气孔参数与大气CO_2浓度的相关性及其影响因素  

Impacting factors and relationship between stomatal parameters and atmospheric CO_2 concentration

作　　者：马清温[1] 李凤兰[1] 李承森[2] 

机构地区：[1]北京林业大学生物科学与技术学院,北京100083 [2]中国科学院植物研究所,北京100093

出　　处：《西北植物学报》2004年第11期2020-2024,共5页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金项目 30070056 ;中国科学院基金项目资助 Nos:KSCXZ-SW-101A;KZCX1-10-01

摘　　要：通常认为气孔参数 气孔密度和气孔指数 和大气CO2浓度有负相关关系,但不是每种植物的气孔参数都与CO2浓度的变化有负相关关系,气孔参数对大气CO2浓度的显著反应也只在一定的CO2浓度范围内发生.大气CO2浓度是影响气孔参数变化的主要因素,同时温度、水分的供应和光照条件等其它环境因素也影响气孔参数.CO2浓度和光照条件主要影响气孔发生,而其它环境因素主要影响叶片表皮细胞的大小.气孔指数部分消除了表皮细胞大小带来的影响,用气孔指数指示大气CO2浓度比用气孔密度指示更为可靠.Most plants show an inverse relationship between the stomatal parameters (density and index) and atmospheric CO_2.The relationship is affected by C_3 or C_4 plants,amphistomatous or hypostomatous,age of plants and leaves.CO_2 concentration is not the sole factor determining stomatal parameters,and stomatal parameters are also affected by various environmental factors,such as temperature,water,and irradiance.CO_2 and irradiance are mainly related to stomatal initiation,and other environmental factors are generally related to epidermal cell expansion.Stomatal density is sensitive to both stomatal initiation and epidermal cell expansion,while stomatal index is sensitive only to stomatal initiation.The results of environmental impacts on stomatal parameters indicate that stomatal index should yield more accurate CO_2 estimates.

关 键 词：气孔密度 气孔指数 CO2 环境因素 

分 类 号：Q945.79[生物学—植物学]