摘要
利用人工环境控制系统封顶式生长室(STC),研究CO_2浓度升高(850μmol/mol)对高原湿地优势挺水植物水葱光合特性、形态特征及生物量的影响。结果表明:高CO_2浓度使水葱净光合速率、胞间CO_2浓度、水分利用效率显著提高,气孔导度及蒸腾速率降低;水葱株高和基径在高CO_2浓度下表现出株高降低而基径增加的趋势;CO_2浓度升高使水葱地下生物量和总生物量显著增加,根冠比明显提高,生物量增加有助于提高湿地生态系统初级生产力,增加湿地碳输入。
Using sealed-top chamber of artificial environment control system, we studied the effects of elevated CO2 （850 μmol/mol） on the photosynthetic characteristics, morphological traits and biomass of a dominate aquatic plant （Scirpus validus） of plateau wetland in Yunnan. The results showed that net photosynthetic rate, intercellular CO2 concentration and water use efficiency of S. validus significantly improved. Conversely, stomatal conductance and transpiration rate decreased. S. validus grown under elevated COg showed lower plant height and higher basal diameter, but the difference was not significant under two CO2 concentrations. Underground biomass and total bio- mass of S. validus increased significantly compared with the control, and root-shoot ratio increased obviously as well. The more accumulation of biomass is helpful to increase the primary productivity of wetland ecosystem and the carbon input of wetland.
出处
《西南林业大学学报（自然科学）》
CAS
北大核心
2016年第5期84-88,共5页
Journal of Southwest Forestry University：Natural Sciences
基金
国家973计划前期研究专项(2012CB426509)资助
国家自然科学基金(40971285
31370497
41001332)资助
云南省科技创新人才计划(2012HC007)资助
关键词
光合作用
植物形态
生物量
CO2
水葱
photosynthesis, plant morphology, biomass, CO2, Scirpus validus
