植物生态学报 ›› 2017, Vol. 41 ›› Issue (1): 31-42.DOI: 10.17521/cjpe.2016.0251

• 研究论文 • 上一篇    下一篇

中国南方灌丛优势木本植物叶的氮、磷含量及其影响因素

李家湘1,2, 徐文婷1, 熊高明1, 王杨1, 赵常明1, 卢志军3, 李跃林4, 谢宗强1,*()   

  1. 1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
    2中南林业科技大学林学院, 长沙 410004
    3中国科学院武汉植物园水生植物与流域生态院重点实验室, 武汉 430074
    4中国科学院华南植物园, 广州 510650
  • 收稿日期:2016-07-28 接受日期:2016-12-25 出版日期:2017-01-10 发布日期:2017-01-23
  • 通讯作者: 谢宗强
  • 作者简介:

    * 通信作者Author for correspondence (E-mail:sunzhiqiang1956@sina.com)

  • 基金资助:
    中国科学院战略性先导科技专项 (XDA05050302)

Leaf nitrogen and phosphorus concentration and the empirical regulations in dominant woody plants of shrublands across southern China

Jia-Xiang LI1,2, Wen-Ting XU1, Gao-Ming XIONG1, Yang WANG1, Chang-Ming ZHAO1, Zhi-Jun LU3, Yue-Lin LI4, Zong-Qiang XIE1,*()   

  1. 1State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China

    2College of Forest, Central South University of Forestry & Technology, Changsha 410004, China;

    3Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
    and
    4South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
  • Received:2016-07-28 Accepted:2016-12-25 Online:2017-01-10 Published:2017-01-23
  • Contact: Zong-Qiang XIE
  • About author:

    KANG Jing-yao(1991-), E-mail: kangjingyao_nj@163.com

摘要:

探索植物器官中氮(N)、磷(P)含量沿环境梯度的分异规律, 有助于揭示陆地生态系统物质循环和植物养分适应策略的过程和机制。该文采用分层随机抽样法, 在中国南方12个省市区布设462个灌丛样点, 对其中193种优势木本植物叶N、P含量进行调查取样。结果表明: 1)南方灌丛优势木本植物叶的N、P含量几何均值分别为16.57 mg·g-1和1.02 mg·g-1; 其中, 落叶木本植物(17.91 mg·g-1、1.14 mg·g-1)显著高于常绿木本植物(15.19 mg·g-1、0.89 mg·g-1); 叶P含量较N含量具有更大的变异性和环境依赖性。2)随年平均气温(MAT)的升高, 常绿木本植物叶N、P含量降低, 落叶木本植物叶N、P含量呈逐渐增加的趋势; 随年降水量(MAP)的增加, 常绿木本植物叶N含量降低, 落叶木本植物叶N含量增加, 两者P含量下降。3)土壤N含量的增加对两者叶的N含量无显著影响; 但随土壤P含量的增加, 常绿和落叶木本植物叶P含量均显著增加。4)广义线性回归显示, 植物生活型分别可解释叶N、P变异的7.6%和14.4%, MAP和土壤P含量分别解释了0.8%和16.4%的叶P变异。结果表明, 中国南方灌丛中优势植物叶的N含量主要受不同生活型植物生长需求所决定, 而P含量则受气候、土壤和植物生活型共同决定。

关键词: 热带亚热带, 植物功能性状, 植物生活型, 生态化学计量

Abstract:

Aims Understanding the changes in N and P concentration in plant organs along the environmental gradients can provide meaningful information to reveal the underline mechanisms for the geochemical cycles and adaptation strategies of plants to the changing environment. In this paper, we aimed to answer: (1) How did the N and P concentration in leaves of evergreen and deciduous woody plants change along the environmental gradients? (2) What were the main factors regulating the N and P concentration in leaves of woody plants in the shrublands across southern China?
Methods Using a stratified random sampling method, we sampled 193 dominant woody plants in 462 sites of 12 provinces in southern China. Leaf samples of dominant woody plants, including 91 evergreen and 102 deciduous shrubs, and soil samples at each site were collected. N and P concentration of the leaves and soils were measured after lapping and sieving. Kruskal-Wallis and Nemenyi tests were applied to quantify the difference among the organs and life-forms. For each life-form, the binary linear regression was used to estimate the relationships between leaf log [N] and log [P] concentration and mean annual air temperature (MAT), mean annual precipitation (MAP) and log soil total [N], [P]. The effects of climate, soil and plant life-form on leaf chemical traits were modeled through the general linear models (GLMs) and F-tests.
Important findings 1) The geometric means of leaf N and P concentrations of the dominant woody plants were 16.57 mg·g-1 and 1.02 mg·g-1, respectively. The N and P concentration in leaves (17.91 mg·g-1, 1.14 mg·g-1) of deciduous woody plants was higher than those of evergreen woody plants (15.19 mg·g-1, 0.89 mg·g-1). The dependent of leaf P concentration on environmental (climate and soil) appeared more variable than N concentration. 2) Leaf N and P in evergreen woody plants decreased with MAT and but increased with MAP, whereas those in deciduous woody plants showed opposite trends. With increase in MAP, leaf P concentration decreased for both evergreen and deciduous woody plants. 3) Soil N concentration had no significant effect on both evergreen and deciduous woody plants. However, leaf P concentration of the tow increased significantly with soil P concentration. (4) GLMs showed that plant growth form explained 7.6% and 14.4% of variation in leaf N and P, respectively. MAP and soil P concentration contributed 0.8% and 16.4% of the variation in leaf P, respectively. These results suggested that leaf N was mainly influenced by plant growth form, while leaf P concentration was driven by soil, plant life-form, and climate at our study sites.

Key words: tropical and subtropical region, plant functional traits, life form, ecological stoichiometry