摘要
采用LI-6400便携式光合系统,对库布齐沙地建群种油蒿以及人工栽培植物塔落岩黄芪和沙打旺的光合作用、蒸腾作用及水分利用效率进行了研究。结果表明,库布齐沙地的油蒿表现出高光合、高蒸腾的特点,其净光合速率和蒸腾速率均大于塔落岩黄芪和沙打旺,但水分利用效率较低;塔落岩黄芪表现出高光合、低蒸腾的特点,水分利用效率较高;沙打旺表现出低光合、低蒸腾的特点,水分利用效率介于油蒿和塔落岩黄芪之间。油蒿与塔落岩黄芪的净光合速率日变化呈明显的双峰曲线,沙打旺只在16∶00出现一个单峰。气孔导度和光合有效辐射作为重要的生理因子和主要环境因子分别影响着三种植物净光合速率和蒸腾速率的变化。
Photosynthesis,transpiration and moisture use efficiency of Artemisia ordosia which is constructive species,Hedysarum fruticosum var.laeve and Astragalus adsurgens which are both artificial cultivation species were measured using the LI-6400 portable photosynthesis system.The results showed that A.ordosia performed higher photosynthesis and transpiration rates and lower moisture use efficiency.H.fruticosum var.laeve performed higher photosynthesis and lower transpiration rates and higher moisture use efficiency.A.adsurgens performed lower photosynthesis and lower transpiration rates,and the moisture use efficiency of which was higher than that of A.ordosia and lower than that of H.fruticosum var.laeve.Diurnal variation of net photosynthesis rate of A.ordosia and H.fruticosum var.laeve presented obvious double peaks.A.adsurgens only peaked at 16∶00.Stoma conductivity as important physiological factor and photosynthetically active radiation as major environmental factor affected net photosynthesis and transpiration rates of three plants.
出处
《中国草地学报》
CSCD
北大核心
2010年第2期116-120,共5页
Chinese Journal of Grassland
基金
中央级公益性科研院所基本科研业务费专项资金(中国农业科学院草原研究所)项目
关键词
库布齐沙地
净光合速率
蒸腾速率
水分利用效率
Kubuqi desert
Net photosynthesis rate
Transpiration rate
Moisture use efficiency
