摘要
利用步入式CO2生长室模拟研究了CO2浓度变化和土壤含水量的交互作用对燕麦(Avena sativa)的光合、生长及水分利用效率的影响。结果表明,低CO2浓度对燕麦的光合作用和生物量产生极大的抑制作用,而高CO2浓度产生一定的促进作用。在低CO2浓度下,燕麦的净光合速率和水分利用效率随着水分含量的降低没有发生显著变化,生物量和叶氮含量有少量降低,根冠比增加。在高CO2浓度下,燕麦的净光合速率、根冠比、水分利用效率随着水分含量的降低而有升高趋势,叶氮含量变化不显著,但生物量显著下降。研究认为过去低CO2浓度没有加剧干旱对燕麦的负面影响,将来高CO2浓度也未能减缓干旱对燕麦的负面影响。燕麦对过去低CO2浓度的适应可能限制了自身对将来高CO2浓度的响应。
The interaction of CO2 concentration and soil moisture on photosynthesis,growth and water use efficiency in oat（Avena sativa）was observed in the walk-in CO2 chamber.The results showed that low CO2 concentration inhibited photosynthesis and biomass production of oat greatly while elevated CO2 promoted them slightly.With soil moisture content declined,net photosynthetic rate and water use efficiency didn＇t change,whereas biomass and leaf N contents slightly decreased,and the ratio of root to shoot increased at low CO2 concentration.Net photosynthetic rate,the ratio of root to shoot and water use efficiency increased,whereas biomass significantly decreased,and leaf N content did not change at high CO2 concentration.These results suggested that low CO2 concentration did not intensify the negative effects of drought,and high CO2 concentration failed to relieve the negative effects of drought stress on oat.The adaptation of oat to low CO2 concentration may limit its responses to future high CO2 concentration.
出处
《草业科学》
CAS
CSCD
北大核心
2015年第7期1116-1123,共8页
Pratacultural Science
基金
教育部第49批留学回国人员科研启动基金--喀斯特生态系统草本植物在CO2浓度变化条件下对干旱的生态适应[教外司(2015)311号]
重庆市自然科学基金项目--喀斯特水逆境下无机碳源对AM真菌植物N
P利用的影响及机制研究(cstc2014jcyjA80016)
关键词
CO2浓度升高
燕麦
水分胁迫
光合速率
生物量
increased CO2concentration
Avena sativa
water stress
photosynthetic rate
biomass
