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草业学报 ›› 2023, Vol. 32 ›› Issue (10): 58-70.DOI: 10.11686/cyxb2022476

• 研究论文 • 上一篇    下一篇

紫草科2种短命植物功能性状的差异化协变特征

金欣悦1,2,3(), 龚莉1, 王梦亭1,2,3, 陶冶2,3, 周多奇1()   

  1. 1.安庆师范大学生命科学学院,皖西南生物多样性研究与生态保护安徽省重点实验室,安徽 安庆 246133
    2.荒漠与绿洲生态国家重点实验室,干旱区生态安全与可持续发展重点实验室,中国科学院新疆生态与地理研究所,新疆 乌鲁木齐 830011
    3.新疆抗逆植物基因资源保育与利用重点实验室,中国科学院新疆生态与地理研究所,新疆 乌鲁木齐 830011
  • 收稿日期:2022-12-07 修回日期:2023-02-10 出版日期:2023-10-20 发布日期:2023-07-26
  • 通讯作者: 周多奇
  • 作者简介:E-mail: duoqizhou@163.com
    金欣悦(1999-),女,安徽阜阳人,在读硕士。E-mail: golden_moon3@163.com
  • 基金资助:
    国家自然科学基金项目(U2003214)

Differential covariation characteristics in functional traits of two ephemerals of Boraginaceae in the Gurbantunggut Desert, China

Xin-yue JIN1,2,3(), Li GONG1, Meng-ting WANG1,2,3, Ye TAO2,3, Duo-qi ZHOU1()   

  1. 1.Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui,College of Life Sciences,Anqing Normal University,Anqing 246133,China
    2.State Key Laboratory of Desert and Oasis Ecology,Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China
    3.Key Laboratory of Conservation and Utilization of Plant Gene Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China
  • Received:2022-12-07 Revised:2023-02-10 Online:2023-10-20 Published:2023-07-26
  • Contact: Duo-qi ZHOU

摘要:

短命植物是为逃避夏季干旱而演化成的一类特殊植物类群,但不同种的短命植物功能性状是否具有相同或相似的协变特征尚不明晰。以新疆古尔班通古特沙漠广布的紫草科不同属短命植物硬萼软紫草和假狼紫草为研究对象,通过野外采样及室内测定,使用降主轴回归、主成分分析及植物性状网络分析对比探究不同物种功能性状特征、性状间异速生长关系及性状协变关系的差异性。结果表明,假狼紫草地上生物量(2.217 g·株?1)、全株生物量(2.407 g·株?1)、冠幅直径(14.26 cm)及冠幅株高比(1.550)显著高于硬萼软紫草(1.010 g·株?1、1.145 g·株?1、10.95 cm和1.138),但后者根冠比(0.147)高于前者(0.091)。硬萼软紫草和假狼紫草功能性状间大多具有显著的异速生长关系(a≠1),如地上生物量分配速率高于地下(a=0.888和0.909),但生物量分配具有个体大小依赖。二者株型呈现出不同的发育模式,其中硬萼软紫草株高与冠幅直径呈等速生长(a=1.095),而假狼紫草冠幅生长速率远高于株高(a=1.516),导致其个体越大越发育为“矮胖型”植株。主成分分析和性状网络分析表明,2种植物性状间的协变关系存在差异,性状网络中的中心性状和网络结构参数不相同。研究表明,即使为同科不同属的短命植物,其功能性状及性状关联特征也不完全一致,体现出一定的种间特异性。

关键词: 草本植物, 异速生长关系, 性状网络, 趋异适应, 荒漠生态系统

Abstract:

Ephemerals are a specialised plant group that have evolved to escape summer drought, but it is not clear whether the functional traits of different ephemeral species have the same or similar covariant characteristics. In this study, two species from the same family (Boraginaceae) but different genera widely distributed in the Gurbantunggut Desert, Xinjiang, China, Arnebia decumbens and Nonea caspica, were studied to answer this question. The data were obtained by field sampling and indoor measurement, and the differences in functional traits, allometric relationships among traits and trait covariance relationships of different species were systematically studied by reduced major axis regression, principal component analysis and plant trait network analysis. The results showed that the aboveground biomass (2.217 g·plant-1), whole plant biomass (2.407 g·plant-1), crown diameter (14.26 cm), and crown diameter to height ratio (1.550) of N. caspica were significantly higher than A. decumbens (1.010 g·plant-1, 1.145 g·plant-1, 10.95 cm, and 1.138), but the root-to-shoot ratio of the latter (0.147) was significantly greater than the former (0.091). There were mostly significant allometric relationships (α≠1) among functional traits of the two species, e.g., aboveground biomass allocation rates were higher than the belowground biomass (α=0.888 and 0.909), but the biomass allocation was body size-dependent for them. The two species showed different phenotypic developmental patterns. For example, the height and crown diameter of A. decumbens grew at an equal rate (α=1.095), while N. caspica increased crown diameter at a much higher rate than height (α=1.516), resulting in the larger body size or ‘stumpy’ plant shape. Principal component analysis and plant trait network analysis revealed that differences in covariant characteristics among functional traits existed for the two species, and the hub traits and network topological parameters in the trait networks also differed. The study showed that even for ephemerals from different genera in the same family, the functional traits and trait association characteristics were not identical and showed a degree of species specificity.

Key words: herbaceous plant, allometric relationship, trait network, radiate adaptation, desert ecosystem