【摘要】 0 .8 5 71mg/m3 SO2 处理油桐后对其光合能量传递效率进行了测定。结果表明 :长期低浓度SO2 熏气处理引起叶绿素含量和类胡萝卜素含量的下降 ,类胡萝卜素与总叶绿素比值升高 ,这导致了色素分子所吸收的总的光合能量的下降。引起光系统Ⅱ和光系统Ⅰ最大光能转换效率和潜在活性的下降 ,导致了光系统所传递和转换的光合电子总量的下降。引起了光合速率下降和呼吸速率的升高 ,并导致了单位面积叶片鲜重和干重的下降。我们得出结论 :长期低浓度SO2 熏气处理以后油桐生长减缓是由于色素含量减少所导致的捕光能力下降 ,光系统的光能转换效率和电子传递效率下降、光合电子流向发生变化、固定能量的减少和能量消耗的增加所导致的。更多还原

【Abstract】 The photo energy transfer efficiency in oil tung tree（Vernicia fordii）was tested after long and low concentration SO₂ fumigation（0.857 1 mg/m³）. The results showed that the contents of chlorophyll and carotenoid decreased and the ratio of carotenoid/chlorophyll decreased after SO₂ fumigation,which resulted in the amount of photosynthetic energy absorbed by the pigment. The maximal photo energy conservation efficiencies and potential activities of photosystem Ⅱ and photosystem Ⅰ decreased after SO₂ fumigation,which resulted in the amount of photosynthetic electrons transferred and transformed by the photosystem The photosynthesis rate decreased and the respiration increased by SO₂ fumigation, and the biomass of leaves decreased. We had the conclusion that the slowing of growth of oil tung tree was caused by the ability of capture photo of pigments,the photosynthetic energy conservation efficiencies and potential activities of photosystem,the flowing direction of photosynthetic electrons,the decreasing of fixed energy and increasing of consumption energy.更多还原