植物生态学报 ›› 2020, Vol. 44 ›› Issue (11): 1138-1153.DOI: 10.17521/cjpe.2020.0105

• 研究论文 • 上一篇    下一篇

内蒙古典型草原植物叶片碳氮磷化学计量特征的季节动态

熊星烁1,2, 蔡宏宇2, 李耀琪2, 马文红3, 牛克昌4, 陈迪马5, 刘娜娜2, 苏香燕2, 景鹤影2, 冯晓娟6, 曾辉1,2,*(), 王志恒2,*()   

  1. 1北京大学深圳研究生院城市规划与设计学院, 广东深圳 518055
    2北京大学生态研究中心, 北京大学城市与环境学院, 北京大学地表过程分析与模拟教育部重点实验室, 北京 100871
    3内蒙古大学生态与环境学院, 呼和浩特 010021
    4南京大学生命科学学院, 南京 210023
    5三峡大学生物与制药学院, 湖北宜昌 443002
    6中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093
  • 收稿日期:2020-04-15 接受日期:2020-07-16 出版日期:2020-11-20 发布日期:2021-01-05
  • 通讯作者: 曾辉,王志恒
  • 作者简介:王志恒: ORCID:0000-0003-0808-7780,Wang ZH: zhiheng.wang@pku.edu.cn
    *Zeng H: zengh@pkusz.edu.cn;
  • 基金资助:
    国家重点研发计划(2018YFA0606104);国家自然科学基金(31988102)

Seasonal dynamics of leaf C, N and P stoichiometry in plants of typical steppe in Nei Mongol, China

XIONG Xing-Shuo1,2, CAI Hong-Yu2, LI Yao-Qi2, MA Wen-Hong3, NIU Ke-Chang4, CHEN Di-Ma5, LIU Na-Na2, SU Xiang-Yan2, JING He-Ying2, FENG Xiao-Juan6, ZENG Hui1,2,*(), WANG Zhi-Heng2,*()   

  1. 1School of Urban Planning and Design, Peking University Shenzhen Graduate School, Shenzhen, Guangdong 518055, China
    2Institute of Ecology, Key Laboratory for Earth Surface Processes of the Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
    3School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China
    4School of Life Sciences, Nanjing University, Nanjing 210023, China
    5College of Biology and Pharmacy, China Three Gorges University, Yichang, Hubei 443002, China
    6State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
  • Received:2020-04-15 Accepted:2020-07-16 Online:2020-11-20 Published:2021-01-05
  • Contact: ZENG Hui,WANG Zhi-Heng
  • Supported by:
    National Key R&D Program of China(2018YFA0606104);National Natural Science Foundation of China(31988102)

摘要:

分析植物叶片(C)、氮(N)、磷(P)含量及其比值的季节动态, 不仅有助于认识植物生长发育和养分吸收利用等生理生态过程, 也有利于认识植物化学计量的动态平衡关系。该文选择内蒙古典型温带草原18种常见植物, 在生长季的6-9月, 每半月一次进行连续采样, 在此基础上分析了叶片C、N、P含量及其比值在生长季内的变化。主要结果: 1)植物叶片C、N、P含量及其比值的季节性变化在不同功能类群间不同步, 其中叶片N、P含量的季节变化体现了明显的稀释作用。2)叶片C、N、P含量及其比值在不同功能类群间差异显著, 单子叶、多年生禾草类的叶片N、P含量显著低于双子叶和多年生杂类草植物, 而其叶片C:N、C:P则高于双子叶和多年生杂类草植物。3)叶片N、P含量显著正相关, 叶片C:N和C:P分别与N和P含量显著负相关, 可能体现了植物体内营养元素间的内在耦合机制。4)叶片N含量与C:N, 叶片P含量与C:P以及叶片N含量与P含量均呈现等速生长关系, 且等速生长关系在生长季保持稳定。

关键词: 季节动态, 生态化学计量学, 异速生长, 叶片, 典型草原

Abstract:

Aims Exploring the seasonal dynamics in leaf carbon (C), nitrogen (N) and phosphorus (P) concentrations and their ecological stoichiometric characteristics will enhance our understanding about physiological and ecological processes such as plant growth and development and nutrient uptake and utilization as well as dynamic equilibrium relationship among plant stoichiometry.
Methods Here, we collected leaf samples of 18 dominant plant species semimonthly through growing season (i.e. from June 2nd to Sept. 2nd) from a long-term fenced site in a typical steppe in Xilinhot of Nei Mongol, China. Leaf C, N and P concentrations were measured. Seasonal changes in leaf C, N and P concentrations and their ratios were explored and their differences between different species groups were analyzed using one-way ANOVA. The relationships between leaf C, N and P concentrations and their ratios were analyzed using correlation analysis. Lastly, the allometric relationships between the concentrations of different elements were analyzed using Standardized Major Axis.
Important findings Seasonal trends in leaf C, N and P concentrations and their ratios were not consistent with each other and also differed between different functional groups. Specifically, the variation of leaf N and P concentrations for all functional groups showed obvious dilution effect. Monocotyledons and perennial grasses had lower leaf N and P concentrations but much higher leaf C:N and C:P mass ratio than dicotyledons and perennial forbs, respectively. Leaf N concentration was positively correlated with leaf P concentration while leaf C:N and C:P mass ratios were negatively correlated with leaf N and P concentrations respectively, indicating the internal coupling mechanism between nutrient elements in plants. Allometric analyses showed that leaf N concentration and C:N mass ratio, leaf P concentration and C:P mass ratio as well as leaf N and P concentrations all maintained the same growth rate respectively among species through most time of growing season.

Key words: seasonal dynamic, stoichiometry, allometry, leaf, typical steppe