植物生态学报 ›› 2021, Vol. 45 ›› Issue (9): 952-960.DOI: 10.17521/cjpe.2021.0101

• 研究论文 • 上一篇    下一篇

阔叶红松林不同演替阶段灌木叶片碳氮磷化学计量特征及其影响因素

宋语涵1, 张鹏1, 金光泽1,2,*()   

  1. 1东北林业大学生态研究中心, 哈尔滨 150040
    2东北林业大学森林生态系统可持续经营教育部重点实验室, 哈尔滨 150040
  • 收稿日期:2021-03-19 接受日期:2021-06-03 出版日期:2021-09-20 发布日期:2021-07-22
  • 通讯作者: 金光泽
  • 作者简介:ORCID: *金光泽: 0000-0002-9852-0965(taxus@126.com)
  • 基金资助:
    国家自然科学基金(32071533)

Characteristics of shrub leaf carbon, nitrogen and phosphorus stoichiometry and influencing factors in mixed broadleaved-Korean pine forests at different successional stages

SONG Yu-Han1, ZHANG Peng1, JIN Guang-Ze1,2,*()   

  1. 1Center for Ecological Research, Northeast Forestry University, Harbin 150040, China
    2Key Laboratory of Sustainable Forest Ecosystem Management Ministry of Education, Northeast Forestry University, Harbin 150040, China
  • Received:2021-03-19 Accepted:2021-06-03 Online:2021-09-20 Published:2021-07-22
  • Contact: JIN Guang-Ze
  • Supported by:
    National Natural Science Foundation of China(32071533)

摘要:

灌木是森林生态系统的重要组成部分, 对于演替进程中灌木叶片化学计量特征的研究, 有助于全面理解和预测森林演替过程。该研究以黑龙江凉水国家自然保护区内处于阔叶红松(Pinus koraiensis)林不同演替阶段中的白桦(Betula platyphylla)次生林、落叶阔叶混交林、针阔混交林、阔叶红松林的灌木为研究对象, 分析其叶片的碳(C)、氮(N)、磷(P)化学计量特征差异, 并利用层次分割方法检验其与土壤、物种多样性的关系。主要结果为: 1)随着演替的进行, 阔叶红松林的叶片N含量显著高于其他3种林型, P含量与白桦次生林无显著差异, 但显著高于其他两种林型; 2)土壤N、P含量与个体尺度上的叶片N含量均呈显著正相关关系, 土壤P含量与叶片P含量呈显著正相关关系; 3)群落尺度上, 物种多样性和土壤化学性质共解释叶片N含量变异的82%和叶片P含量变异的62%; 4)群落尺度上Shannon多样性指数与灌木叶片的N、P含量呈显著正相关关系, 与灌木叶片的C:N、C:P呈显著负相关关系。总之, 阔叶红松林4个演替阶段灌木均受到氮限制; 相较于土壤的化学性质, 物种多样性更好地解释了灌木化学计量的变异。

关键词: 物种多样性, 养分限制, 土壤, 小兴安岭, 阔叶红松林

Abstract:

Aims Shrubs are an important component of forest ecosystems. This study investigated changes in the stoichiometric characteristics of shrub leaves during forest succession in order to understand and predict the processes of forest succession.

Methods The study was conducted in the Liangshui National Nature Reserve of Heilongjiang Province, with forest stands at different successional stages of mixed broadleaved-Korean pine (Pinus koraiensis) forest representing secondary birch (Betula platyphylla) forest, mixed deciduous broad-leaved forest, mixed coniferous and broad-leaved forest, and mixed broadleaved-Korean pine forest. Measurements were made on carbon (C), nitrogen (N) and phosphorus (P) contents in leaves of the understory shrubs and soil, and the stoichiometric characteristics of shrub leaves and relationships with soil stoichiometry were examined with hierarchical analysis.

Important findings The N content in shrub leaves was significantly higher in the mixed broadleaved-Korean pine forest than in other three forest types; the P content was significantly higher in the mixed broadleaved-Korean pine forest than in two other forest types except the secondary birch forest. Soil N and P contents were significantly and positively correlated with leaf N content at individual scale, and soil P concentration was significantly and positively correlated with leaf P content. At the community level, 82% of leaf N content variation and 62% of leaf P content variation were explained by species diversity and soil chemical properties; the Shannon diversity index was significantly and positively correlated with the N and P contents in shrub leaves, and negatively with the leaf C:N ratio and C:P ratio. In conclusion, shrubs in mixed broadleaved-Korean pine forests at the four successional stages were all N-limited, and species diversity better explains the stoichiometric variations in understory shrubs than soil chemical properties.

Key words: species diversity, nutrient limitation, soil, Xiao Hinggan Mountains, mixed broadleaved-Korean pine forest