高CO_2浓度下羊草对土壤干旱胁迫的响应  

Response of Aneurolepidium chinense on soil drought stress under high CO_2

作　　者：高素华[1] 郭建平[1] 周广胜[2] 

机构地区：[1]中国气象科学研究院,北京100081 [2]中国科学院植物研究所,北京100093

出　　处：《中国生态农业学报》2002年第4期31-33,共3页Chinese Journal of Eco-Agriculture

基　　金：国家重点基础研究发展(973)规划项目(G1999043407)资助

摘　　要：在高CO_2浓度下羊草对土壤干旱胁迫响应的人工模拟试验分析表明,CO_2浓度升高对羊草具有“施肥”效应,羊草生物量增加20％以上,光合速率提高50％左右,气孔阻力增大,蒸腾速率下降,水分利用效率提高,土壤干旱胁迫对羊草的影响为负效应,与此相反,高CO_2浓度下发生土壤干旱胁迫一定程度抑制了CO_2的施肥效应。The 'applying fertilizer' effects of CO2 enrichment on Aneurolepidium chinense are analyzed by using artificial simulation experiment. The results show that when the biomass is increased by above 20% ,the photosynthesis rate is increased by about 50% ,at the same time,stoma resistance enhanced, transpiration rate decreased and water use efficient heightened. The impacts of soil drought stress on Aneurolepidium chinense are negative,it is just opposite compared with CO2 enrichment. The soil drought stress restrains the 'applying fertilizer' effect on some degree under high CO2 concentration.

关 键 词：高CO2浓度 羊草 土壤干旱胁迫 响应 

分 类 号：S812.2[农业科学—草业科学]