红雉凤仙花对模拟增温的光合生理响应  

Photosynthetic Physiological Response of Impatiens oxyanthera to Simulated Warming

作　　者：王力 杨有芹 王琼[1,2] WANG Li;YANG Youqin;WANG Qiong(College of Life Sciences,China West Normal University,Nanchong Sichuan 637009,China;Key Laboratory of Southwest China Wildlife Resources Conservation of the Ministry of Education,China West Normal University,Nanchong Sichuan 637009,China)

机构地区：[1]西华师范大学生命科学学院,四川南充637009 [2]西华师范大学西南野生动植物资源保护教育部重点实验室,四川南充637009

出　　处：《西华师范大学学报（自然科学版）》2019年第4期339-345,共7页Journal of China West Normal University(Natural Sciences)

基　　金：国家自然科学基金项目(31600391);西华师范大学英才科研基金项目(17YC345)

摘　　要：植物的光合生理特征对气候变化敏感,研究气候变暖背景下植物的光合特性有助于揭示植物对气候变化的响应与适应机制。本文以生长于峨眉山的我国特有植物红雉凤仙花Impatiens oxyanthera为研究对象,采用红外加热器模拟增温,测定增温和常温条件下植物叶片的气体交换特征并由此计算光合响应参数,这对预测未来气候变化下该植物的适应性及指导引种栽培具有重要意义。结果表明:(1)增温处理导致日平均气温和10cm深土壤温度分别显著增加1.643℃和0.982℃,日平均大气湿度显著降低1.496%;(2)与对照相比,增温处理使净光合速率显著降低12.739%,相反使蒸腾速率、气孔导度和胞间CO2浓度分别显著增加4.541%、23.181%和1.475%,对水分利用效率和表观CO2利用效率影响不显著;(3)增温区的表观量子效率、光饱和点、光补偿点和暗呼吸速率分别比对照区增加94.915%、29.082%、7.522%和57.561%,而最大净光合速率则显著降低4.750%。结果说明:短期的增温降低了红雉凤仙花的光合速率,因而气候变暖可能不利于红雉凤仙花生长。As the photosynthetic physiological characteristics of plants are sensitive to climate change,studies on the photosynthetic characteristics of plants under the background of climate warming are helpful to reveal the response and adaptation mechanism of plants to climate change.Therefore,this paper takes Impatiens oxyanthera of Mt.Emei as the research object and employs infrared heaters for simulated warming.The gas exchange characteristics of plant leaves under warming and ambient temperature conditions are measured,and the photosynthetic response parameters are calculated.It is of great significance for predicting the adaptability of the plant under future climate change and guiding its introduction and cultivation.The results show that:(1)Simulated warming has significantly increased the daily mean air temperature and 10 cm-depth soil temperature by 1.643℃ and 0.982℃,but decreased daily average air humidity by 1.496%.(2)The net photosynthetic rate under warming has significantly reduced by 12.739%,compared with that of ambient temperature.On the contrary,transpiration rate,stomatal conductance and intercellular CO2 concentration have significantly increased by 4.541%,23.181% and 1.475%,respectively.No significant effects have been found on water use efficiency and apparent CO2 utilization efficiency.(3)Compared with the corresponding values in the ambient temperature condition,apparent quantum efficiency,light saturation point,light compensation point and dark respiration rate in the warming condition have increased respectively by 94.915%,29.082%,7.522% and 57.561%.However,the maximum net photosynthetic rate has decreased significantly by 4.750%.These results suggest that short-term warming decreases the photosynthetic rate of I.oxyanthera.Hence,climate warming might be unfavourable to the growth of I.oxyanthera.

关 键 词：气候变暖 红雉凤仙花 气体交换特征 光合响应参数 

分 类 号：Q945.79[生物学—植物学]