Study on the photosynthetic characteristics of introduced {\sl Alnus formosana}
Study on the photosynthetic characteristics of introduced {\sl Alnus formosana}
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发表时间：
2004
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通讯作者：
Wanze Zhu;Jinxi Wang;J. Xue
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作者：
Wanze Zhu;Jinxi Wang;J. Xue
对引种台湾桤木2年生幼苗的光合生理生态特性进行了研究。主要研究结果如下。（1）叶片净光合速率（Pn）有明显的日变化。生育中期（7月）中部叶片Pn日变化呈双峰型，峰值分别在9：00和15：00，峰值分别为15.03 μ mol·m-2.s-1和12.97 μ mol·m-2.s-1。而Pn的日变化在春季（4月）和秋季（10月）都只有一个高峰。不同穗位叶片的净光合速率大小顺序为中部叶>上部叶>下部叶。（2）不同时期不同部位叶片的季节变化不同。中部叶片和上部叶片Pn的季节变化分别在6月和8月出现双峰，下部叶片只有一个峰值，出现在6月。光合作用的研究。台湾的温度适宜范围很广。自然条件下叶片的最大净光合速率为17.67 μ #mol. m~（-2）·s~（-1），人工条件下为20.2 μ #mol. m~（-2）·s~（-1），表明A.台湾杜鹃对新环境具有较强的光合适应性。（3）叶片的LCP在33.32 ~ 67.47 μ mol·m ~（-2）·s ~（-1）之间，LSP在1332--1656 μ mol·m ~（-2）·s ~（-1）之间，说明A.台湾杜鹃对弱光和强光都有较强的利用能力，对光强有广泛的适应性。（4）光合作用的CO2补偿浓度在54.17- 74.98 μ mol·m~（-1）之间，CO2饱和浓度在800 μ mol·m ~（-1）左右，羧化酶效率在0.0270- 0.0468之间，说明A.台湾杜鹃光合潜力大，适应性广。（5）通径分析表明，电导率（Cond）、胞间CO_2浓度（Ci）、叶片水汽压差（Vpdl）和相对湿度（RH）是影响Pn变化的最重要的直接因子。
The photosynthetic physio-ecological characteristics of two-years-old seedlings of introduced Alnus formosana were studied in this paper. The main results showed as follows. (1)The net photosynthetic rate (Pn) of leaves have obvious diurnal changes. The diurnal change of Pn of the middle leaves during the middle of growth period (July) showed the double-peak type, and the peak value was 15.03 #mu#mol·m~(-2)·s~(-1) at 9:00 and 12.97 #mu#mol·m~(-2)·s~(-1) at 15:00 respectively. However, the diurnal change of Pn during both the beginning period (April) and the late period (October) is of only peak. The order of Pn of leaves in different position of stick is middle leaves>upper leaves>lower leaves. (2)The leaves in different position of stick had different seasonal change during various periods. The seasonal change of Pn at both the middle leaves and the upper leaves showed the double-peak in June and in August respectively; and the lower leaves had only one-peak value, occurred in June. The photosynthesis of A. formosana had an extensive suitable range to temperature. The maximum Pn of leaves was 17.67 #mu#mol·m~(-2)·s~(-1) under the natural condition, and 20.2 #mu#mol·m~(-2)·s~(-1) under artificial condition, this indicated that A. formosana had strong photosynthetic adaptability to the new environment. (3)The LCP of leaves was about between 33.32 #mu#mol·m~(-2)·s~(-1) and 67.47 #mu#mol·m~(-2)·s~(-1), and the LSP between 1332--1656 #mu#mol·m~(-2)·s~(-1), these indicated that A. formosana had strong ability to utilize both the weak light and the strong light, and extensive adaptability to light intensities. (4)The CO_(2) compensate concentration of photosynthesis was between 54.17--74.98 #mu#mol·m~(-1), and the CO_(2) saturate concentration 800 #mu#mol·mol~(-1) or so, and the carboxylase efficiency between 0.0270--0.0468, which indicated that A. formosana had great photosynthetic potential and very extensive adaptability. (5)The path coefficient analysis indicated that the conductance factor (Cond), inter-cellular CO_(2) concentration (Ci), the vapor pressure deficit on leaf (Vpdl) and the relative humidity (RH) are the most important direct factors to influence the changes of Pn.