园林专业毕业论文汇.doc

石楠与红叶石楠的光和特性比较研究  PAGE \* MERGEFORMAT 6 石楠与红叶石楠的光合特性比较研究 中文摘要：在田间条件下采用英国PP Systems 公司制造的CIRAS-2 型便携式光合系统分析仪，对石楠、红叶石楠的光合特性进行测定。结果表明：在晴天条件下石楠、红叶石楠的光合速率日变化均为双峰曲线，并具有光合“午休”现象。石楠、红叶石楠的光饱和点分别约1 200～1 400 μmol·m-2·s-1，1 400～1 600 μmol·m-2·s-1；光补偿点分别为127.0μ mol·m-2·s-1，59.26 μmol·m-2·s-1；光合表观量子效率分别为0.02000，0.02216，说明石楠、红叶石楠属于喜光树种，且红叶石楠较耐荫，对光环境的适应性较强。 关键词：石楠；红叶石楠；光合特性 Comparative study on photosynthetic characteristics of Photinia serrulata and Photinia frasery Dress Student majoring in Landscape Architecture Jiachunbo Teachers Fanhuimin Abstract：The photosynthetic characteristics of Photinia serrulata and Photinia frasery Dress were mea- sured in the field conditions using CIRAS-2 portable photosynthetic system made by the company of UK PP Systems. The result showed that both Photinia serrulata and Photinia frasery Dress had a double-peak curve of diurnal variation of photosynthesis and a phenoenon of photosynthetic “noon breaking” in sunny days. Light saturation points of Photinia serrulata and Photinia frasery Dress were 1 200-1 400 μmol·m-2·s-1 and 1 400-1 600 μmol·m-2·s-1 respectively，light compensation points of them were 127.00 μmol·m-2·s-1 and 59.26 μmol·m-2·s-1 respectively，and photosunthetic apparent quantum yield of them were 0.02000 and 0.02216 respectively. The experimental results showed that Photinia serrulata and Photinia frasery Dress belongs to light species，and the shade tolerance and light adaptability of Photinia frasery Dress was better. Key words：Photinia serrulata；Photinia frasery Dress；photosynthetic characteristics 1 前言 石楠（Photinia serrulata） 为蔷薇科石楠属常绿小乔木。喜温暖湿润的气候，对土壤要求不严，以肥沃湿润的砂质土壤最为适宜，萌芽力强，耐修剪，其树冠圆整，叶片光绿，初春嫩叶紫红，春末白花点点，秋日红果累累，极富观赏价值[1],是著名的庭院绿化树种,抗烟尘和有毒气体，且具隔音功能,叶根可入药。南方地区常用作嫁接枇杷的砧木。 红叶石楠（Photinia frasery Dress）是蔷薇科石楠属杂交种的统称，常绿小乔木［2］，春秋两季的新梢和嫩叶火红，夏季高温时新叶萌发减少，老叶转为深绿，冬季经历霜雪的叶片呈褐红色，被誉为“红叶绿篱之王”，具有很高的园林应用价值［3］。红叶石楠生长速度快，萌芽性强，耐修剪，可根据园林需要修剪成不同的形状。因其新叶四季鲜红亮丽，且配合修剪可常年保持极其醒目的鲜红色，为此在园林景观绿化中，作为绿篱、绿墙、造型树、孤植树等均具有极佳的景观效果。 石楠、红叶石楠是目前市场上广受