植物生态学报 ›› 2017, Vol. 41 ›› Issue (11): 1140-1148.doi: 10.17521/cjpe.2017.0049

• 研究论文 • 上一篇    下一篇

兴安落叶松叶水力与光合性状的变异性和相关性

李志民, 王传宽*(), 罗丹丹   

  1. 东北林业大学生态研究中心, 哈尔滨 150040
  • 收稿日期:2017-02-28 接受日期:2017-08-26 出版日期:2017-11-10 发布日期:2017-11-10
  • 通讯作者: 王传宽 E-mail:wangck-cf@nefu.edu.cn
  • 基金资助:
    国家“十三五”重点研发计划项目(2016YFD0600201)和教育部长江学者和创新团队发展计划(IRT_15R09)

Variations and interrelationships of foliar hydraulic and photosynthetic traits for Larix gmelinii

Zhi-Min LI, Chuan-Kuan WANG*(), Dan-Dan LUO   

  1. Center for Ecological Research, Northeast Forestry University, Harbin 150040, China
  • Received:2017-02-28 Accepted:2017-08-26 Online:2017-11-10 Published:2017-11-10
  • Contact: Chuan-Kuan WANG E-mail:wangck-cf@nefu.edu.cn

摘要:

树木叶水力和光合性状的变异性及权衡策略对评估和预测气候变化对树木的存活、生长及分布至关重要。在帽儿山森林生态站27年生兴安落叶松(Larix gmelinii)人工林从山谷至山脊设立一条由5个样地组成的全坡位样带, 测量兴安落叶松黎明前叶水势(Ψpre)、基于叶面积和叶质量的水力导度(KareaKmass)、抗栓塞能力(P50)、比叶质量(LMA)、净光合速率(A)、叶氮含量(N)等叶水力和光合相关参数, 探索其叶性状随立地条件的变异性和相关性。结果表明: 不同样地的ΨpreKareaKmassP50A、LMAN均存在显著差异(p < 0.05), 表明叶性状随立地条件变化而表现出显著的种内变异性。ΨpreKareaKmass均与P50显著相关(p < 0.05), 表明兴安落叶松种内存在一定的水力效率与安全权衡关系。A、LMAN均存在成对相关关系(p < 0.05)。然而,水力性状与光合性状之间相关不显著。兴安落叶松响应于立地条件变化而表现出的叶水力和光合性状的可塑性和多重相关性, 是该树种的一种生存生长策略。

关键词: 叶性状, 比叶质量, 光合速率, 水力导度, 种内变异, 立地效应

Abstract:
Aims Variations and potential trade-offs of leaf hydraulic and photosynthetic traits are essential for assessing and predicting the effect of climate change on tree survival, growth and distribution. Our aims were to examine variations and interrelationships of leaf hydraulic and photosynthetic traits in response to changes in site conditions for Dahurian larch (Larix gmelinii)—a dominant tree species in Chinese boreal forests.
Methods This study was conducted at the Maoershan Forest Ecosystem Research Station. A transect of 27 year-old Dahurian larch plantation was established that consisted of five plots extending from the valley to the ridge of a slope. The predawn leaf water potential (Ψpre), area- and mass-based leaf hydraulic conductance (Karea and Kmass, respectively), resistance to embolism capacity (P50), leaf mass per area (LMA), net photosynthetic rate (A), and leaf nitrogen content (N) were measured in August 2016.
Important findings The Ψpre, Karea, Kmass, P50, A, LMA, and N all varied significantly among the plots (p < 0.05), indicating significant intra-specific variations in these traits in response to the changes in site conditions. The P50 was significantly (p < 0.05) correlated with Ψpre, Karea or Kmass, suggesting that a trade-off between hydraulic efficiency and safety exist within the species to some degree. There were significant (p < 0.05) pairwise correlations between A, LMA, and N. Nevertheless, there was no significant (p < 0.05) correlation between the measured photosynthetic traits and hydraulic traits. We concluded that the intra-specific variations and multiple interrelationships of the leaf hydraulic and photosynthetic traits for the larch reflect the plasticity of its leaf traits and strategies of its survival and growth as a result of its acclimation to diverse site conditions.

Key words: leaf traits, leaf mass per area, photosynthetic rate, hydraulic conductance, intra-specific variation, site effect