植物生态学报 ›› 2010, Vol. 34 ›› Issue (1): 7-16.DOI: 10.3773/j.issn.1005-264x.2010.01.003

• 生态化学计量学专题论文 • 上一篇    下一篇

温带草地主要优势植物不同器官间功能性状的关联

周鹏1, 耿燕1, 马文红2, 贺金生1,*()   

  1. 1北京大学城市与环境学院生态学系, 北京 100871
    2北京大学深圳研究生院环境与城市学院, 深圳 518055
  • 收稿日期:2008-05-05 接受日期:2008-07-23 出版日期:2010-05-05 发布日期:2010-01-01
  • 通讯作者: 贺金生
  • 作者简介:* E-mail: jshe@pku.edu.cn

Linkages of functional traits among plant organs in the dominant species of the Inner Mongolia grassland, China

ZHOU Peng1, GENG Yan1, MA Wen-Hong2, HE Jin-Sheng1,*()   

  1. 1Department of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
    2School of Environment & Urban Study, Peking University Shenzhen Graduate School, Shenzhen 518055, China
  • Received:2008-05-05 Accepted:2008-07-23 Online:2010-05-05 Published:2010-01-01
  • Contact: HE Jin-Sheng

摘要:

理解植物各器官间功能性状的关联, 有助于确定控制功能性状的内在机制以及性状间的比例关系。基于内蒙古温带草地19个地点、42种优势草本植物的野外观测, 分析了叶片、茎、生殖器官、细根和粗根间功能性状(N、P含量、N:P、比叶面积、比根长以及叶片和细根的组织密度)的关联。主要结果如下: 在种群和物种水平上, 各器官的N和P含量都显著正相关, 比叶面积与叶片N、P含量和组织密度在种群水平上显著负相关, 而在物种水平上没有显著的相关关系; 而比根长仅在种群水平上与细根的组织密度显著负相关。N、P含量以及N:P在各器官之间一致呈显著正相关, 而比叶面积和比根长没有显著的相关关系。叶片和细根的组织密度在种群水平上显著负相关, 而在物种水平上没有显著的相关关系。非禾草比禾草相应器官(除茎外)的N、P含量高, 但二者茎的N、P含量没有显著的差异; 豆科植物比非豆科植物相应器官的N含量高, 而P含量没有显著的差异。

关键词: 生态计量学, 植物器官, 比叶面积, 比根长, 温带草地, 组织密度

Abstract:

Aims The temperate grasslands in Inner Mongolia, representing a great diversity in vegetation types (desert steppe, typical steppe and meadow steppe) and function groups (grass/herb, legume/non-legume), are ideal places to test the hypothesized functional trait relationships among plant organs. Our main objective in this study was to test whether plant functional traits vary in a coordinated fashion both within and across organs.

Methods Based on the field observation during July and August in both 2006 and 2007, we measured suites of ecophysiological traits of 42 grassland species from 19 sites in Inner Mongolia. The longitude of the study region ranges from 112.82° to 120.12° (E), and the latitude ranges from 41.76° to 49.89° (N). N and P concentrations, N:P ratios of leaves, stems, reproductive structures, fine roots (diameter < 1 mm) and coarse roots (diameter > 1 mm) as well as tissue density of leaf and fine root and specific leaf area/specific root length were determined.

Important findings At both population and interspecific level, N and P concentrations were positively correlated within each organ. Specific leaf area was negatively correlated with leaf N and P concentrations and tissue density at the population level but not at the interspecific level. Specific root length was negatively related to fine root tissue density at population level. Plants with low leaf or fine root tissue density had leaves or fine roots with high N concentrations and large specific leaf area or specific root length. N and P concentrations as well as N: P ratios were also consistently correlated across all organs, but no correlation between specific leaf area and specific root length was observed. At the population level there existed a weak negative correlation between leaf and fine root tissue density while at interspecific level this relationship disappeared. Grasses had lower N and P concentrations than herbs in leaves, reproductive structures and roots, but not in stems. Legumes had higher N concentrations than non-legumes in all organs, but they showed no significant differences in P concentrations.

Key words: ecological stoichiometry, plant organ, specific leaf area, specific root length, temperate grassland, tissue density