植物生态学报 ›› 2019, Vol. 43 ›› Issue (2): 131-138.doi: 10.17521/cjpe.2019.0291

• 研究论文 • 上一篇    下一篇

亚热带常绿阔叶林散孔材和环孔材树种导管及叶片功能性状的比较

张振振1,*(),赵平2,张锦秀1,斯瑶1   

  1. 1 浙江师范大学地理与环境科学学院, 浙江金华 231004
    2 中国科学院华南植物园, 广州 510650
  • 收稿日期:2018-11-14 接受日期:2019-01-30 出版日期:2019-02-20 发布日期:2019-06-04
  • 通讯作者: 张振振 E-mail:zhangzhen@zjnu.cn
  • 基金资助:
    国家自然科学基金(41630752);国家自然科学基金(41701226);浙江省公益技术研究计划项目(GF19C030003)

Conduits anatomical structure and leaf traits of diffuse- and ring-porous stems in subtropical evergreen broad-leaved forests

ZHANG Zhen-Zhen1,*(),ZHAO Ping2,ZHANG Jin-Xiu1,SI Yao1   

  1. 1 School of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, Zhejiang 231004, China
    2 South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
  • Received:2018-11-14 Accepted:2019-01-30 Online:2019-02-20 Published:2019-06-04
  • Contact: ZHANG Zhen-Zhen E-mail:zhangzhen@zjnu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(41630752);Supported by the National Natural Science Foundation of China(41701226);the Zhejiang Province Public Welfare Technology Application Research Project(GF19C030003)

摘要:

植物导管结构特征对其自身的生存策略具有重要影响, 但目前对于亚热带常绿阔叶林树种这方面的认识仍然不足。为了研究这一地区的植物导管特征与叶片功能性状之间的关系, 该研究选择广东石门台自然保护区亚热带森林中两种优势种桂林栲(Castanopsis chinensis)和木荷(Schima superba), 通过比较旱季(10月至次年3月)两树种的导管形态特征、叶片形态特征、叶片生理特征来研究环孔材树种和散孔材树种的功能性状差异。用独立样本t检验对两个树种的这些性状进行差异性分析。结果表明: 1)木荷(散孔)导管密度显著高于桂林栲(环孔), 而桂林栲导管的直径远大于木荷导管的直径。2)木荷叶片含水量(LWC)、叶绿素a/b值显著大于桂林栲, 而气孔密度和比叶面积则显著低于桂林栲, 两者气孔导度和光合速率并没有显著差异。以上结果表明, 在亚热带森林中, 环孔材树种桂林栲在温度高湿度低的干旱条件下, 能够通过增加叶片比叶面积维持较高的光合能力, 而另一方面, 其叶片对干旱胁迫的耐受性较弱, 而散孔材木荷则具有较好的光能转化能力和干旱耐受能力, 这种差异性在降水格局变化逐渐加深的背景下, 可能会引起森林群落结构发生分化。

关键词: 环孔, 散孔, 叶片特征, 生存策略, 亚热带森林

Abstract:
Aims The conduits characters are critical for plants to develop their survival strategies. Our current knowledge in this regard remains limited for the subtropical forest. In this study, we set a study objective to quantify the relationship between the conduits characters and the leaf functional traits of the dominant species in the region.
Methods Two dominant species, Castanopsis chinensis and Schima superba, in a subtropical forest in Shimentai Nature Reserve were selected to compare their differences in functional traits, including conduits anatomical structure, the leaf morphological characteristics, and leaf physiological characteristics. The study was conducted during the dry season (October to March of the following year) for quantifying the ring-porous and diffuse-porous species. A series of t-tests were performed to quantify the statistical differences of all traits between the two species.
Important findings We found that the density of conduits of S. superba (diffuse-porous) was significantly higher than that of C. chinensis (ring-porous), while the diameter of conduits for C. chinensis was much larger than that of S. superba. The leaf water content and the Chlorophyll a/Chlorophyll b ratio were much higher for S. superba than that of C. chinensis; the stomatal density and specific leaf area (SLA) tended to be higher in C. chinensis. In addition, it appeared that the differences in leaf specific net photosynthetic rates and the leaf stomatal conductance were not significant between S. superba and C. chinensis. These results indicated that the ring-porous species C. chinensis maintain a high photosynthetic capacity by maintaining a higher SLA at the expense of low leaf water content in responding to the water stress. The diffuse-porous species S. superba, meanwhile, tended to maintain a high capability of light transform under drought. These functional differences might be responsible for the succession pathways under the gradual changes of global precipitation for the region.

Key words: ring-porous, diffuse-porous, leaf trait, survival strategy, subtropical forest