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5种龙船花叶功能性状研究

2017-11-04韦阳连田海娟余金昌吴宪王雪兵王瑛

天津农业科学 2017年10期

韦阳连++田海娟++余金昌++吴宪++王雪兵++王瑛

摘 要:为了解5个龙船花品种的叶片功能性状特征,对其叶形指数、比叶面积、叶干物质含量和叶片SPAD值等特征进行了测量。结果表明,叶形指数在龙船花品种间存在显著差异,在品种内具有相对的同一性和稳定性,可作为龙船花品种的鉴别依据之一;叶片SPAD值与比叶面积、叶片干物质含量间的相关性不显著,且存在品种间差异;比叶面积和叶片干物质含量间均呈极显著负相关关系;依据比叶面积大小排序得知,5种龙船花的生产力和截获光的能力大小排序为黄花龙船花>龙船花>密花龙船花>黑猫龙船花>宫粉龙船花。

关键词:龙船花;叶形指数;比叶面积;叶片干物质含量;叶片SPAD值

中图分类号:Q945.79 文献标识码:A DOI 编码:10.3969/j.issn.1006-6500.2017.10.006

Study on Leaf Functional Characteristics of Five Ixora Varieties

WEI Yanglian1, TIAN Haijuan1, YU Jinchang1, WU Xian1, WANG Xuebing1, WANG Ying1,2

(1.Dongguan Botanical Garden, Dongguan, Guangdong 523086, China; 2.Gansu Province Environmental Monitoring Center Station, Lanzhou, Gansu 730020, China)

Abstract:To compare the leaf functional characteristics of five Ixora varieties, their leaf index, specific leaf area, leaf dry matter content and leaf SPAD value were studied in this paper. The results showed that the leaf index was different significantly among Ixora varieties, but selfsame relatively inside the same variety. The result showed that the Ixora varieties could be identified by leaf index. The relationship between leaf SPAD value and specific leaf area, leaf dry matter content were not significant, and different among varieties. of all the varieties, there was significantly negative correlation between specific leaf area and leaf dry matter content. According to the study results of specific leaf area, the productivity and the ability to intercept light of five Ixora varieties, Ixora coccimea 'Lutea', Ixora chinensis, Ixora hybrid 'Jacquline', Ixora hybrid 'Maui' and Ixora × westi was decreasing.

Key words:Ixora; leaf index; specific leaf area; leaf dry matter content; leaf SPAD value

葉片是植物进行光合作用的主要器官,是植物将自然界中的能量进行转换利用的纽带,其功能性状直接影响植物的基本行为和功能[1-2]。叶片功能性状指标包括叶形指数(Leaf index,LI)、叶面积(Leaf area,LA)、比叶面积(Specific leaf area,SLA)、叶片干物质含量(Leaf dry matter content,LDMC)、叶片叶绿素含量(Leaf chlorophyll content,LCC)、叶片氮含量(Leaf nitrogen content,LNC)、 叶片磷含量(Leaf phosphorus content,LPC)、叶片钾含量(Leaf kalium content,LKC)等,这些功能性状指标与植株生物量和植物对资源的获得、利用及利用效率的关系密切,能够反映植物适应环境的生存对策[3],不同的植物种类在适应环境过程中的叶片功能性状不同[4]。

在我国,广义的龙船花泛指龙船花属(Ixora)植物,狭义的龙船花是指龙船花属的Ixora chinensis Lam.种。龙船花属植物是极具热带特色的花灌木,其花色丰富、花型奇特,深受人们喜爱,近年来逐渐被人们熟知并应用在园林景观配置中。目前,园……

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