三种木质藤本植物光合特性比较研究

ttttt目的ttttt对25个茶树品种春、夏、秋季的光合性能进行评价。ttttttttttttt方法ttttt采用Li-6400光合系统测定不同茶树春、夏、秋季新梢叶片的光合参数并予以统计分析。ttttttttttttt结果ttttt因子分析提取的2个因子可以概括81.16%的光合参数信息，因子1主要受净光合速率(P_n)、气孔导度(G_s)、胞间CO₂浓度(C_i)及羧化率(CE)的影响，因子2主要受水分利用率(WUE)和蒸腾速率(T_r)的影响；春季，铁观音、菊花春的光合因子综合得分较高；夏季，浙农113和中茶302得分较高；秋季，浙农113和巴渝特早得分较高。系统聚类将所有材料分为2类，其中大部分茶树夏季的叶片为一类，具有较高的P_n和WUE；春、秋季的所有茶树叶片及黔湄502等6个茶树品种的夏季叶片为一类，具有较高的P_n、G_s、C_i和T_r，但WUE较低。tttttttttttttttttt结论ttttt制定栽培管理措施时应因时因品种制宜。tttt

Photosynthetic characteristics of invasive and noninvasive species of Rubus (Rosaceae)

tttttPurposetttttPhotosynthetic performance of 25 tea cultivars in different seasons would be evaluated.tttttttttttttMethodtttttPhotosynthetic parameters of different tea cultivars at spring, summer and autumn were measured by an intelligent portable photosynthesis system (Li-6400X), and the data would be analyzed.tttttttttttttResulttttttThe first two factors accounted for 81.16% of the total variation. Factor 1 was mainly affected by the levels of net photosynthetic rate (P_n), stomatal conductance (G_s), intercellular CO₂ concentration (C_i) and carboxylation efficiency (CE), factor 2 was mainly affected by the levels of water use efficiency (WUE) and transpiration rate (T_r). Tieguanyin and Juhuachun had the higher factor score in spring, Zhenong 113 and Zhongcha 302 had the higher factor score in summer, in addition, Zhenong 113 and Bayu Tezao had the higher factor score in autumn. All the cultivars were classified into 2 types, tea leaves of most of the cultivars in summer were A type, which showed the better P_n and WUE levels, and the leaves of all the tea cultivars in spring and autumn and the leaves of Qianmei 502, Nanjiang Daye, Wuniuzao, Meizan, Mengshan 11 and Chuanmu 217 in summer were the B type, which shows the better P_n, G_s, C_i and T_r levels, but the lower WUE level.ttttttttttttttttttConclusiontttttThe cultivation management measures of tea plant should be formulated according the cultivars and season.tttt