基于稳定碳同位素技术研究青藏高原东部高寒区植被的光合型  

Photosynthetic pathways of plants grown in alpine and cold region in the East Qinghai-Tibet Plateau based on stable carbon isotope values

作　　者：李明财[1] 易现峰[1] 李来兴[1] 张晓爱[1] 

机构地区：[1]中国科学院西北高原生物研究所

出　　处：《西北植物学报》2004年第6期1052-1056,共5页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金项目( 30270217 )

摘　　要：通过对青藏高原东部玛多县境内高寒地区20个科、38个属、62种植物叶片的稳定性碳同位素的测定,来确定植物群落的光合型.结果表明,所测定的62种植物的稳定性碳同位素比值 δ13C 介于-28.6‰和-25.2‰之间,说明这62种植物均属于C3植物,没有C4植物或CAM植物.植物这种光合型的分布与该研究区的环境因素有密切关系,低温是该区没有C4植物分布的关键因素,同时光合型的分布也反映了植物对独特地理环境的适应.Using the measurement of stable carbon isotopes in leaves, we investigate photosynthetic pathway of 62 plant species grown in alpine and cold region, southeast of Qinghai, China. The results indicate that the δ^(13)C values of plants have a narrow range from -28.6‰ to -25.2‰, which means that none of the species examined belongs to C_4 and CAM (Crassulaceous Acid Metabolism) photosynthetic pathway and all of these species perform photosynthesis through the C_3 pathway. This may be affected by many kinds of environmental factors and temperature is the most important one in this study.At the same time,this is likely due to a long-term adaptation to the adverse environments at Qinghai-Tibet Plateau.

关 键 词：Δ^13C 光合型 青藏高原 

分 类 号：Q945.1[生物学—植物学]