CAJ | 학술논문

探讨金沙江干热河谷元谋段13种野外生长树种在干季的光合光响应曲线特征参数,得出结论:1)以光合光响应曲线上光能利用效率的下降位点来界定植物表观光合速率随光强呈线性增长的弱光区域是科学可行的;2)分段函数对供试树种光合光响应曲线具有良好的拟合性能;3)弱光区域的界定与否对表观量子效率α和暗呼吸速率R_d均产生明显影响,而对光补偿点LCP、光饱和点LSP及最大表观光合速率P_(max)等3个特征参数影响不明显;4)元谋干热河谷13个树种在干季3月的表观光合量子效率、暗呼吸速率、光补偿点、光饱和点、最大净光合速率大小范围分别为0.020 7～0.059 2 μmol CO_2·m~(-2)s~(-1)/μmolphotons·m~(-2)s~(-1),-2.07～-0.31 μmol CO_2·m~(-2)s~(-1),14～37 μmolphotons·m~(-2)s~(-1),1 015～1 648 μmolphotons·m~(-2)s~(-1),3.09～19.32 μmol CO_2·m~(-2)s~(-1);5)最大净光合速率P_(max)、表观量子效率α、饱和光能利用效率SLUE 3者间的树种排序十分相似,这表明树种在弱光区域及饱和光强下的光能利用效率愈高,其最大净光合效率一般亦越高.
탐토금사강간열하곡원모단13충야외생장수충재간계적광합광향응곡선특정삼수,득출결론:1)이광합광향응곡선상광능이용효솔적하강위점래계정식물표관광합속솔수광강정선성증장적약광구역시과학가행적;2)분단함수대공시수충광합광향응곡선구유량호적의합성능;3)약광구역적계정여부대표관양자효솔α화암호흡속솔R_d균산생명현영향,이대광보상점LCP、광포화점LSP급최대표관광합속솔P_(max)등3개특정삼수영향불명현;4)원모간열하곡13개수충재간계3월적표관광합양자효솔、암호흡속솔、광보상점、광포화점、최대정광합속솔대소범위분별위0.020 7～0.059 2 μmol CO_2·m~(-2)s~(-1)/μmolphotons·m~(-2)s~(-1),-2.07～-0.31 μmol CO_2·m~(-2)s~(-1),14～37 μmolphotons·m~(-2)s~(-1),1 015～1 648 μmolphotons·m~(-2)s~(-1),3.09～19.32 μmol CO_2·m~(-2)s~(-1);5)최대정광합속솔P_(max)、표관양자효솔α、포화광능이용효솔SLUE 3자간적수충배서십분상사,저표명수충재약광구역급포화광강하적광능이용효솔유고,기최대정광합효솔일반역월고.
Characteristic parameters of photosynthesis in response to irradiance of 13 naturally-regenerated tree species, which were used for vegetation restoration in the dry-hot river valley of the Jinsha River, were studied and several main conclusions were drawn. It was theoretical and feasible to determine the weak light range by the descending point of light using efficiency on light response curve. The subsection functions provided a well-fitted simulating curve for photosynthetic response to irradiance. The determination of weak light region had significant effect on apparent quantum yield of photosynthesis (α) and dark respiration rate (R_d), however it had not obvious effect on light compensation point (LCP), light saturation point (LSP) and maximum apparent photosynthesis rate (P_(max)). The variation ranges of α, R_d LCP,LSP, P_(max) of 13 tree species in dry March respectively were 0.020 7～0.059 2 μmol CO_2·m~(-2)s~(-1)/μmolphotons·m~(-2)s~(-1), -2.07～-0.31μmol CO_2·m~(-2)s~(-1), 14～37 μmolphotons·m~(-2)s~(-1), 1 015～1 648 μmolphotons·m~(-2)s~(-1), 3.09～19.32 μmol CO_2·m~(-2)s~(-1). There were similar rank of the 13 species among the bases of the maximum apparent photosynthesis rate, the saturation light using efficiency and apparent quantum yield of photosynthesis, which suggested that if the tree species had a higher light using efficiency in weak light region and under the saturated light, they often had a higher maximum apparent photosynthesis rate.