模拟光条件下4个四川桤木品系 光合特性的研究

为了研究四川桤木不同品系对光的响应，为其引种和扩大栽培提供理论依据，对模拟光条件下H1、H12、J5、J10品系光合特性进行了研究，结果表明：（1）4个桤木品系具有较低的LCP（介于3.16~50.61μmol/-2·s^-1>之间）和较高的LSP（＞800μmol/-2·S^-1>），其LCP、LSP的大小排序均为J10＞H12＞J5＞H1；4个品系能适应多种光照环境。H12、J10强光利用效率高，其生长速度高于H1、J5品系，H1、J5品系利用弱光能力较强；（2）表观量子效率为0.0303~0.0495mol/mol，与自然条件下一般植物的表观量子效率（0.03~0.05mol/mol）基本一致；（3）影响其净光合速率（Pn）主要生理生态因子是气孔导度、胞间CO2浓度和光照强度等，J5、J10品系Pn还受到CO₂R较大的影响；而Tleaf、Vpdl对H1、H12品系的Pn影响比较明显。

Study on Photosynthetic Characteristics of Four Varieties of Alnus. cremastogyne Burk under Simulated Light Condition

In order to explore the response to light of different varieties of A. cremastogyne Burk to provide theoretical basis for introduction and extending theirs cultivation area, the photosynthetic characteristics of four varieties, namely, H1, H12, J5 and J10, were studied in this paper. The results showed as follows: (1) four varieties had rather lower light compensation point (LCP)( 3.16~50.61μmol/-2·s^-1>) and rather higher light saturation point(LSP)(＞800μmol/-2·s^-1>), and both of the two indexes’order were J10＞H12＞J5＞H1, which indicated that four varieties could adapt many types of light condition, and H12 and J10 had rather stronger ability to make use of strong light, and theirs growth rate was higher than that of H1 and J5, while the latter had rather stronger ability to utilize weak light; (2) Theirs apparent quantum efficiency (AQE) ranged from 0.0303 mol/mol to 0.0495mol/mol, which basically accorded to conventional AQE under natural condition. (3) The main eco-physiological factors affecting photosynthetic rate (Pn) were stomatal conductance (Gs), intercellular CO2 concentration (Ci) and light intensity, and Pn of J5 and J10 were also affected greatly by CO₂R; However, Pn of H1 and H12 were obvious affected by Tleaf and Vpdl.