目的 研究石斛的光合特性,了解其适宜栽种的光强.方法 测定霍山县3种石斛(霍山石斛Dendrobiumhuoshanens,铁皮石斛D.candium,铜皮石斛D.moniliforme)的光合速率对光强响应曲线,不同光强处理时叶绿素荧光参数的变化及3.0×10⁴ lx瞬时光强下叶片荧光猝灭诱导.结果 霍山县3种石斛属于阴生植物对光强的响应,光饱和点、光补偿点较低,净光合速率和表观量子效率都较低;大于4.0×10⁴ lx强光下石斛叶片受光抑制严重.结论 霍山县3种石斛生长光强,一般为(0.2～
2.0)×10⁴lx;可以在(
2.5～3.0)×10⁴lx光强的环境中生长;不适宜在大于4.0×10⁴lx光强的环境中生长.

Objective To investigate the suitable light intensity of plant growth of Sw.through study on photosynthetic characteristicsMethods The photosynthesis curves of light intensity,chlorophyll fluorescence parameter of different light intensity and inductivity of non-photochemical quenching of chlorophyll fluorescence in 3.0×104lx on three species of Dendrobium Sw.in Huoshan(D.huoshanensD.candiumand D.moniliforme)were determinedResults Three species of Dendrobium Sw.were shadow plants for their response on light intensity,light saturation point,light compensate point,net photosynthesis rate,and apparent quantum efficiency are lower during photosynthesis.The photoinhibitory effect was formed on Dendrobium Sw.1eaf when they grew in more than 4.0×10⁴lxConclusion Although three species of Dendrobium Sw.in Huoshan grow in(0.2-
2.O)×10⁴lx normally,they are suitable to grow in(
2.5-3.0)×10⁴lx instead of growing more than 4.0×10⁴lx.

安徽省“十五”重大科技专项(01803006);安徽省教育厅学术带头人基金资助项目