秋季漳州地区8种园林植物的光响应特性及园林应用

Photosynthetic Light Response Characteristics of 8 Garden Plants and Their Landscape Application in Zhangzhou Area in Autumn

为研究不同植物的光合变化规律和光适应能力,利用便携式光合仪Li-6400,以漳州市龙文区碧湖生态公园内的8种常用园林绿化植物为研究材料,测定不同光照强度梯度下植物光合作用的光响应,运用双曲线修正模型进行拟合,并对其耐荫能力进行分析。结果显示:具有高LCP、高LSP的美丽异木棉适应强光能力强,红花羊蹄甲、三角梅、朱槿具有较高的LCP和LSP,在强光下的适应能力相对较强,耐荫能力相对较差;具有低LCP、低LSP的蒲葵耐荫能力强,利用强光的能力较弱;而红背桂的LCP相对较高、LSP相对较低,不耐强光而具备一定的耐荫能力;香樟、复羽叶栾树的LSP较高、LCP相对较低,既对强光有一定的耐受能力,又能充分利用弱光。8种植物的净光合速率与光照强度、气孔导度、蒸腾速率等影响因子的相关性分析结果显示,影响因子在不同的植物之间各不相同,净光合速率分别与蒸腾速率、胞间CO_(2)浓度呈显著正相关和显著负相关。此外,蒲葵、香樟、红背桂、复羽叶栾树能较好的利用土壤的水分,是良好的节水植物。综上,可在光照充足的林缘、道路隔离带等地配置红花羊蹄甲、三角梅、朱槿、美丽异木棉;蒲葵适宜在林下较荫蔽或无强光直射的地方种植;红背桂适宜在某一时段遮荫或有围墙、其他建筑物或植物遮蔽的地带;香樟、复羽叶栾树光适应范围较宽,可根据景观表达需求实行灵活配置。另外,蒲葵、香樟、红背桂、复羽叶栾树可配置在相对较干旱的地方。

The purpose of this study is to study the photosynthesis and light adaptation of different species of plants.In this paper,taking 8 common garden greening plants in Bihu Ecological Park,Longwen district,Zhangzhou city as the research materials,the portable photosynthesometer Li-6400 was used to measure the photoresponse of plants under different light intensity gradients,and hyperbolic modified model fitting was used to analyze their shade tolerance.The results showed that the Ceiba speciosa with high light compensation point and light saturation point had a strong ability to adapt to bright light.With relatively high light compensation point and light saturation point,Bauhinia blakeana,Bougainvillea spp.and Hibiscus rosa-sinensis had relatively strong adaptability to strong light and poor shade tolerance.The plant of Livistona chinensis with low light compensation point and low light saturation point had strong shade tolerance,but weak ability to use strong light.The light compensation point of Excoecaria cochinchinensis was relatively high,the light saturation point was relatively low,and it was not resistant to strong light and had certain shade tolerance.The light saturation point of Cinnamomum camphora and Koelreuteria bipinnata was high and the light compensation point was relatively low.They not only had a certain tolerance to strong light,but also could make full use of weak light.The correlation analysis of the net photosynthetic rate,light intensity,stomatal conductance,transpiration rate and other influencing factors of 8 plants showed that the influencing factors were different among different plants,and the net photosynthetic rate was significantly positively correlated with transpiration rate and negatively correlated with stomatal conductance.Furthermore,Livistona chinensis,Cinnamomum camphora,Excoecaria cochinchinensis and Koelreuteria bipinnata could make good use of soil water and were good water-saving plants.To sum up,Bauhinia blakeana,Bougainvillea spp.,Hibiscus rosa-sinensis and Ceiba speciosa can be configured in the forest margin and road isolation zone with sufficient light.The plant of Livistona chinensis is suitable for planting in the shade under the forest or in the place without direct sunlight.The plant of Excoecaria cochinchinensis is suitable for shade at a given time or in areas sheltered by walls,other buildings or plants.The plant of Cinnamomum camphora and Koelreuteria bipinnata have a wide range of light adaptation,and can be flexibly configured according to the needs of landscape expression.In addition,the plant of Livistona chinensis,Cinnamomum camphora,Excoecaria cochinchinensis,and Koelreuteria bipinnata can be deployed in relatively arid places.