CO_2浓度和土壤湿度对羊草光合特性影响机理的初探  

Initial study into the CO_2 concentration and soil moisture effects on the photosynthesis impact mechanism of Leymus chinensis

作　　者：高素华[1] 郭建平[1] 

机构地区：[1]中国气象科学研究院,北京100081

出　　处：《草业科学》2004年第5期23-27,共5页Pratacultural Science

基　　金：国家重点基础发展规划项目"我国生存环境演变和北方干旱化趋势预测研究"(G19990 43 40 7)资助

摘　　要：CO2 浓度升高、辐射强度增大对羊草Leymuschinensis生长和生理过程的影响为正效应 ,土壤湿度下降发生干旱对羊草生长和生理过程为负效应 ;CO2 浓度升高使光合补偿点降低是“CO2 施肥效应”的重要生理因素之一。在干旱条件下 ,CO2 浓度升高提高了水分利用率。The impacts of CO_2 concentration, soil moisture, and radiation intensity on growth and physiological processes of Leymus chinensis were analyzed using artificial simulated data for 2 years. CO_2 enrichment and increased radiation intensity had positive effects on growth and physiological processes. Soil moisture reduction leading to drought conditions had negative effects on growth and physiological processes. The relationships between radiation intensity and photosynthetic rate, transpiration rate, and water utilization rate were quantitatively analyzed. CO_2 enrichment causing the photosynthesis compensation point to lower is one of the important physiological factors of the “CO_2 fertilisation effect”.CO_2 enrichment increased water utilization rate under soil drought stress. These are both physiological mechanisms of the “CO_2 fertilization effect” under soil drought stress.

关 键 词：CO2浓度 土壤湿度 羊草 光合特性 机理 土壤干旱胁迫 水分利用率 

分 类 号：S54[农业科学—作物学]