冯燕

摘 要：通过设置不同干旱胁迫处理研究了不同程度干旱胁迫对侧柏容器苗和裸根苗生理特性的影响，结果表明：随着干旱胁迫程度的增加，侧柏过氧化物酶含量、过氧化氢酶含量、脯氨酸含量、可溶性糖含量、丙二醛含量呈逐渐增加的趋势。在中度干旱和重度干旱下，侧柏容器苗的过氧化物酶和过氧化氢酶显著高于裸根苗;但干旱胁迫下，侧柏容器苗脯氨酸、可溶性糖、丙二醛的积累量低于裸根苗。侧柏容器苗在干旱情况下，抗氧化酶调节能力较强，并且丙二醛积累较少，具有较高的干旱耐受能力，可作为干旱瘠薄山地造林的主要育苗方式。

关键词：侧柏;干旱胁迫;生理特性;容器苗;裸根苗

Abstract： The effects of drought stress on physiological characteristics of container seedlings and bare root seedlings of Platycladus orientalis were studied.The results showed that peroxidase， catalase， proline， soluble sugar and malondialdehyde  increased gradually with the increase of drought stress. Under drought stress， especially under moderate drought and severe drought， the peroxidase and catalase of Platycladus orientalis container seedlings were significantly higher than bareroot seedlings. However， under drought stress， the accumulation of proline， soluble sugar and malondialdehyde in container seedlings of Platycladus orientalis was lower than that of bareroot seedlings. In summary， under drought conditions， Platycladus orientalis container seedlings have strong antioxidant enzyme regulation ability and less accumulation of malondialdehyde， It can be used as the main seedling raising method for afforestation in arid and barren mountainous areas.

Keywords： Platycladus orientalis;Drought stress; Physiological characteristics

侧柏（Platycladus orientalis）属柏科常绿乔木，具有极强耐寒、耐旱、抗盐碱的特性，对干冷及温暖的气候有较好的适应能力，是造林与园林绿化美化中不可或缺的树种[1]。目前，苗木栽植仍是植被恢复、植树造林的主要措施。随着我国林木种苗的发展、变革，生产上对林木种苗提出了更高的要求。传统的裸根苗已不能满足现代林木种苗的需求[2]。目前，容器苗在國内造林中得到广泛应用，容器育苗可为林业工程持续提供高质量的苗木[3]。尤其在土壤干旱贫瘠的环境下造林，容器苗相对于裸根苗有较大的优势[4]。在干旱缺水的环境下，植物会表现出一定的抗性和适应性。研究表明当侧柏[7-9]、刺槐[7-8]、梨树[10]、柑橘[11]等受到干旱胁迫时，体内会产生抗氧化物酶，维持体内活性氧代谢的平衡。……