草珊瑚光合特性研究  

Photosynthetic characteristics of Sarcandra glabra

作　　者：程龙军[1] 刘志高[1] 斯金平[1] 郑晨[2] 黄华宏[1] 楼少卿[1] 

机构地区：[1]浙江林学院,浙江临安311300 [2]南京林业大学,江苏南京210037

出　　处：《中国中药杂志》2009年第13期1643-1647,共5页China Journal of Chinese Materia Medica

基　　金：浙江省重大科技项目(2007C12022)

摘　　要：目的：了解草珊瑚光合特性，为草珊瑚科学栽培提供理论依据。方法：采用LI-6400便携式光合仪，对种植在浙江林学院药用植物种质资源圃内采自20个全国主产区草珊瑚种源的植株光合特性进行系统测定与比较。结果：草珊瑚的光饱和点均在800umol·m^-2·s^-1左右，光补偿点在14．70—48．68umol·m^-2·s^-1；各不同种源草珊瑚的净光合速率日变化均呈“双峰”曲线，上下午各有一高峰，在11：00—13：00净光合速率显著降低，出现光合“午休”现象。实验结果表明，影响净光合速率日变化主要因子有胞间二氧化碳浓度（Ci），二氧化碳浓度（CO：S）和蒸腾速率（r），其与净光合速率之间的相关系数均值分别为一0．89（P〈0．01），-0．75（P〈0．05），0．69（P〈0．05）。结论：草珊瑚具有良好的耐荫性，通过遮荫和洒水以降低小环境温度，提高湿度，可减少“午休”现象出现的时间，提高光合效率。Objective： To learn about the photosynthetic characteristics of Sarcandra glabra and provide the theoretic references for its better planting. Method： The photosynthetic parameters of twenty different provenances of Sarcandra g/abra were determined by Li-6400 portable photosynthesis system, and the data was analyzed by Excel and SAS software. Result： The results showed that the light saturation point of different Provenances of S. glabra were almost about 800 umol·m^-2·s^-1, while the light compensation point of them were from 14. 70 umol·m^-2·s^-1 to 48.68 umol·m^-2·s^-1 The curve of net photosynthetic rate had two peaks on sunny day, the first one was in the morning and the other one was in the aftemoorL The photosynthetic ＂noon- break＂ of S. glabra appeared between 11：00-13：00, when the net photosynthetic rate goes down sharply. Intercellular CO2 concentration （Ci ）, CO2 concentration （CO2 S） and transpiration rate （Tr ） all have effect on the diurnal change of net photosynthetic rate （P,） of S. glabra, and the average correlation coefficient between P. and the parameters above were orderly as -0. 89（ P 〈 0. 01 ）, -0. 75 （P 〈 0. 05 ） and 0. 69 （ P 〈 0. 05 ） ; Conclusion： S. glabra was a plant with characteristics of shade-tolerance, and through the way of covering, sprinkling for decreasing the surrounding temperature would be effective to reduce its ＂noon-break＂ time and increas its efficiency of photosynthesis.

关 键 词：草珊瑚 种源 光合特性 耐荫性 

分 类 号：R284.1[医药卫生—中药学]