Abstract
以上海市松江不同郁闭度(低、中、高)生态公益林—— 香樟(<em>Cinnamomum camphora</em>)林下种植的红茴香(<em>Illicium henryi</em>)和大吴风草(<em>Farfugium japonicum</em>)为研究对象, 并以香樟萌生苗为对照, 分析各植物光合特性在不同生长光强下的动态变化。结果表明: 在不同郁闭度下, 红茴香和大吴风草具有较高的表观量子效率(<em>AQE</em>)、较低的光补偿点(<em>LCP</em>), 而香樟具有较高的最大净光合速率(<em>P</em><sub>max</sub>)和光饱和点(<em>LSP</em>)。随着郁闭度的增加,各植物AQE 逐渐增加, 且不同郁闭度处理间均存在显著差异(<em>P</em><0.05); 香樟<em>P</em><sub>max</sub> 表现为逐渐降低的趋势, 红茴香和大吴风草则呈先上升后降低的趋势; 香樟暗呼吸速率Rd 呈现先降低后增加的趋势, 而红茴香和大吴风草则表现为逐渐降低; 各植物的<em>LCP</em> 和<em>LSP</em> 均表现为逐渐降低的趋势以适应弱光环境。可见, 香樟通过降低自身的<em>LCP</em> 和<em>LSP</em> 逐渐适应弱光环境, 但在高郁闭度下其光合作用仍然受到胁迫; 而红茴香和大吴风草则通过降低<em>LCP</em>、<em>LSP</em> 和自身能量消耗来适应弱光环境, 且在中等郁闭度下具有最高的光合能力, 充分证明其阴生特性。
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