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淫羊藿是一种应用广泛的药用植物。因野生资源的过度利用而资源紧张,进行人工栽培是实现资源可持续利用的必由之路。拟巫山淫羊藿是首个实现人工栽培的物种,但种植生产技术尚未完全成熟。用CI-340型光合测定系统原位测定了自然条件下生长的一、二、三年生拟巫山淫羊藿叶片光合作用的日变化,测量了光合速率(P_n)、气孔导度(C)、胞间CO_2浓度(C_i)、光合有效辐射(PAR)、相对湿度(RH)、气温(T_a)、表观叶肉导度(ALMC)、蒸腾速率(E)、叶温(T_l)、水分利用效率(WUE)等光合生理因子和环境因子,并通过相关分析、通径分析和多元逐步回归分析探讨了净光合速率和生理生态因子的关系。结果表明:1拟巫山淫羊藿叶片净光合速率(P_n)、蒸腾速率(E)、表观叶肉导度(ALMC)、气孔导度(C)均呈双峰变化,其净光合速率具有典型的“午休”现象。2一年生植株的净光合效率、表观叶肉导度和气孔导度显著高于二、三年生;而胞间CO_2浓度则基本上是三年生>二年生>一年生。3相关分析、通径分析和多元逐步回归分析表明,表观叶肉导度(ALMC)、胞间CO_2浓度(C_i)、空气温度(T_a)是影响拟巫山淫羊藿光合速率主要的因子,影响大小的顺序为表观叶肉导度>胞间CO_2浓度>空气温度。
Epimedium is a widely used medicinal plant. Due to over-utilization of wild resources and resource constraints, artificial cultivation is the only way to achieve sustainable use of resources. Epimedium wuheshan is the first artificial cultivation of species, but planting production technology has not yet fully mature. The diurnal variation of photosynthesis of Ipomoea tabacus plants grown in natural environment was measured by CI-340 photosynthesis system. The photosynthetic rate (P_n), stomatal conductance (C), photosynthetic rate C_i, PAR, RH, T_a, ALMC, T, T_ (1), water use efficiency (WUE) and other photosynthetic physiological factors and environmental factors, and through the correlation analysis, path analysis and multivariate stepwise regression analysis to explore the relationship between net photosynthetic rate and physiological and ecological factors. The results showed that: (1) The net photosynthetic rate (P_n), transpiration rate (E), apparent leaf mellitus (ALMC) and stomatal conductance (C) of Epimedium wadm. “Lunch break ” phenomenon. The annual net photosynthetic rate, apparent mesophyll conductance and stomatal conductance of annual plants were significantly higher than those of second and third year, while the intercellular CO 2 concentration was basically three years> biennial> annual. Correlation analysis, path analysis and multivariate stepwise regression analysis showed that apparent leaf meat conductivity (ALMC), intercellular CO_2 concentration (C_i) and air temperature (T_a) were the main factors affecting the photosynthetic rate of epimedium The order of magnitude is apparent mesophyll conductance> intercellular CO 2 concentration> air temperature.