首页 | 本学科首页   官方微博 | 高级检索  
     


Microclimate, Photosynthesis and Growth of Lucerne (Medicago sativa L.). I. Microclimate and Photosynthesis
Authors:SHEEHY, J. E.   WOODWARD, F. I.   JONES, M. B.   WINDRAM, A.
Affiliation:The Grassland Research Institute Hurley, Maidenhead, Berks. SL6 5LR"{ddagger}"
Abstract:Measurements of microclimate and photosynthesis of lucerne var.Europe were made in the field during the spring of 1976. Themaximum rate of canopy gross photosynthesis (14.3 g CO2 m–2h–1, I = {infty}) was 2.5 times greater than that of S 24 perennialryegrass at the same LAI. This difference was due to differencesin individual leaf photosynthesis. The photosynthetic rate ofthe youngest fully expanded leaf of lucerne remained constantthroughout the experimental period at 3.6 g CO2 m–2 h–1(300 W m–2). Measurements of soil water potential profiles indicated thatlucerne extracted water from the soil to a depth of at least800 mm, with a region of maximum uptake between 400 and 600mm. This capability, with a moderate mean leaf resistance of460 s m–1, conferred a high assimilation efficiency onlucerne, with a mean water use efficiency of 34 g H2O lost pergram of carbohydrate assimilated, compared with 200 g H2O pergram of carbohydrate for S 24. Medicago sativa L, lucerne, photosynthesis, assimilation efficiency
Keywords:
本文献已被 Oxford 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号