摘要
应用CIRAS-2型光合测定系统,在人为浇水至土壤饱和后的自然耗水干旱过程中,测定了2年生盆栽蔷薇Rosa multiflora光合作用的CO_(2)响应过程,采用指数改进模型对其响应过程进行拟合。结果表明:维持蔷薇光合作用较高水平的土壤相对含水量(RWC)范围在43.8%~84.9%之间,最适宜的RWC在64.4%左右,维持蔷薇光合作用最低RWC在18.3%左右。蔷薇平均净光合速率(P_(n)^(-))、羧化效率(CE)、光合能力(P_(nma)x)随RWC增加呈“升缓降陡”的抛物线形变化趋势,几项参数受淹涝胁迫时的下降趋势要快于受干旱胁迫时的下降趋势,表明蔷薇具有耐旱不耐涝的光合生理特征。
Using CIRAS-2 photosynthetic system,the CO_(2)response of 2-year-old Rosa multiflora photosynthesis was measured during natural water consumption drought from artificial watering to soil saturation.The CO_(2)response process of R.multiflora were fitted by modified exponential model.The results showed that the RWC range of maintaining the higher level of photosynthesis of R.multiflora was between 43.8%and 84.9%,the most suitable RWC was about 64.4%,and the lowest RWC of maintaining photosynthesis of R.multiflora was about 18.3%.The average net photosynthetic rate(P_(n)^(-)),carboxylation efficiency(CE)and photosynthetic capacity(P_(nmax))of R.multiflora showed a parabolic trend of“Slow rise and steep fall”with the increase of RWC.The downward trend of physiological parameters under waterlogging stress was faster than that under drought stress,indicating that rose had the photosynthetic physiology characteristics of drought tolerance but not waterlogging tolerance.
作者
陈建
邢先双
董明明
张明泉
CHEN Jian;XING Xianshuang;DONG Mingming;ZHANG Mingquan(Shandong Hydrology Center,Jinan,Shandong 250002,China)
出处
《林业与环境科学》
2021年第5期91-96,共6页
Forestry and Environmental Science
关键词
土壤水分
蔷薇
光合作用
CO_(2)响应
soil water content
Rosa multiflora
photosynthesis
CO_(2)response
