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珍珠菜属植物功能性状的趋异分化

陈延松1,2*,李玲玲2,周守标1,欧祖兰2   

  1. (1安徽师范大学重要生物资源保护与利用研究安徽省重点实验室,  安徽芜湖 241000;  2合肥师范学院生命科学学院,  安徽合肥 230601)
  • 出版日期:2019-06-10 发布日期:2019-06-10

The differentiation of plant functional traits in genus Lysimachia L.

CHEN Yan-song1,2*, LI Ling-ling2, ZHOU Shou-biao1, OU Zu-lan2   

  1. (1Anhui Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources, Anhui Normal University, Wuhu 241000, Anhui, China; 2College of Life Sciences, Hefei Normal University, Hefei 230601, China).
  • Online:2019-06-10 Published:2019-06-10

摘要: 明确珍珠菜属植物关键功能性状的种间差异性,有助于揭示珍珠菜属植物的生态适应机制。本研究采用植物功能生态学研究方法,利用同质园栽培实验,量化了同质环境条件下9种珍珠菜属植物根、茎、叶功能性状间的变异及协变关系。结果表明: 1) 在属级水平上,该属植物10个功能性状变异程度不同。变异幅度最大的为叶面积,其次是比根长,第三是比茎长,最小的是叶碳含量,变异系数分别为75.0%、60.7%、46.5%、3.6%,最大值与最小值相差近21倍。2) 黄连花亚属与珍珠菜亚属植物功能性状趋异分化(P<0.05),前者形成了比根长、比茎长与比叶面积占优势的功能性状组合,而后者则具有较高的比根密度与叶面积。3) 9种珍珠菜属植物功能性状具有物种特异性,它们的叶面积、比叶面积、叶干物质量、叶碳含量、叶氮含量、叶碳氮比、比根长、比根密度、比茎长和比茎密度均存在显著的种间差异(P<0.05)。4) 9种珍珠菜属植物的根、茎、叶功能性状之间存在植株整体协同性。叶面积与比茎长(R2=0.484, P<0.01)和比根长(R2=0.149, P<0.01)、比茎长与比根长(R2=0.348, P<0.01)相关关系最密切。9种珍珠菜属植物既存在叶经济谱又存在植株经济谱。

关键词: 南疆干旱区, 产量, 机采棉田, 品质, 水盐运移, 灌溉制度

Abstract: Differentiation of the key functional traits among the species within the genus Lysimachia can help understand the mechanism of their ecological adaptation. We quantitatively analyzed the variation and co-variation relations regarding the root, stem and leaf functional traits of nine species from Lysimachia cultivated under the environmentally homogeneous potted conditions using the comparative method in plant functional ecology. The results showed that the variation degree of ten plant functional traits represented by the coefficient of variation (CV) was different at the generic level. Leaf size had the highest degree of variation (CV=75.0%), followed by specific root length (CV=60.7%) and specific stem length (CV=46.5%), and lowest for leaf carbon concentration (CV=3.6%), with the maximum value of CV being 21 fold of the minimum. The subgen. Lysimachia and subgen. Palladiawere significantly different in functional traits (P<0.05). Subgen. Lysimachia was characterized by a combination of plant functional traits dominated by specific root length, specific stem length, and specific leaf area. However, subgen. Palladia had greater root specific density and leaf size. The plant functional traits of Lysimachia were speciesspecific, with significant differences in leaf size, specific leaf area, leaf dry matter content, leaf carbon concentration, leaf nitrogen concentration, leaf C∶N ratio, specific root length, root specific density, specific stem length, and stem specific density (P<0.05). The root, stem and leaf functional traits worked in synergy as a whole plant for each of the nine Lysimachia species. Specifically, leaf size was negatively correlated with specific stem length (R2=0.484, P<0.01) and specific root length (R2=0.149, P<0.01), while specific stem length was positively correlated with specific root length (R2=0.348, P<0.01). Both the leaf economics spectrum and the plant economics spectrum were found for the nine Lysimachia species.

Key words: soil water and salt movement, quality, arid area of Southern Xinjiang, cotton yield, irrigation regime, mechanically-harvested cotton