Carbon balance in stand of an annual herb at an elevated CO2 concentration
Introduction Global atmospheric CO2 concentration is predicted to double by the end of the present century (IPCC,2001).The influence of increased CO2 on plant and ecosystem functions has been a major concern in ecology and global change sciences (Long et al.,2004 ).In most studies,elevated CO2 enhanced canopy photosynthesis.However,the magnitude of the enhancement varies among studies ( Nowak et al.2004 ).More recently,Sakai et al.(2006 ) showed that enhancement of canopy carbon gain by elevated CO2 is sensitive to the growth stage and leaf nitrogen concentration in the rice stand.However,since most of these studies determined photosynthesis in the stand without destructive harvests,they were not able to fully analyze mechanisms involved in variation in stand carbon balance.Canopy photosynthesis is a function of canopy structure (leaf area index,K,leaf nitrogen distribution etc.),leaf physiology ( photosynthesis,respiration etc.) and environmental factors (irradiance,N availability,temperature etc.).In the present study,we studied the effect of elevated CO2 on carbon balance for stands of an annual Chenopodium album.
carbon balance stand photosynthesis respiration elevated CO2 concentration Chenopodium album
Almaz Borjigidai Kouki Hikosaka Tadaki Hirose
Tohoku University,Japan Tohoku University,Japan;Tokyo University of Agriculture,Japan
国际会议
呼和浩特
英文
2008-06-29（万方平台首次上网日期，不代表论文的发表时间）