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应用生态学报 ›› 2017, Vol. 28 ›› Issue (2): 415-422.doi: 10.13287/j.1001-9332.201702.020

• 中国生态学学会2016年学术年会会议专栏 • 上一篇    下一篇

湘西南石漠化地区灌丛植物叶N、P化学计量特征

景宜然1, 邓湘雯1, 2*, 魏辉1, 李艳琼1, 3, 邓东华4, 刘豪健4, 项文化1, 2   

  1. 1中南林业科技大学生命科学与技术学院, 长沙 410018;
    2南方林业生态应用技术国家工程实验室, 长沙 410018;
    3广西喀斯特植物保育与恢复生态学重点实验室/广西壮族自治区中国科学院广西植物研究所, 广西桂林 541006;
    4邵阳县林业局, 湖南邵阳 422100
  • 收稿日期:2016-07-06 出版日期:2017-02-18 发布日期:2017-02-18
  • 通讯作者: * E-mail: dxwfree@126.com
  • 作者简介:景宜然, 女, 1991年生, 硕士研究生. 主要从事森林生态学研究. E-mail: jingyrcsuft@163.com
  • 基金资助:
    本文由国家林业局林业科学技术推广项目([2014]52)和国家林业局荒漠化(石漠化)定位监测项目(20150618)资助

Leaf nitrogen and phosphorus stoichiometry of shrubland plants in the rocky desertification area of Southwestern Hunan, China.

JING Yi-ran1, DENG Xiang-wen1, 2*, WEI Hui1, LI Yan-qiong1, 3, DENG Dong-hua4, LIU Hao-jian4, XIANG Wen-hua1, 2   

  1. 1College of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410018, China;
    2National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China, Changsha 410018, China;
    3Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany/Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, Guangxi, China;
    4Shaoyang Bureau of Forestry, Shaoyang 422100, Hunan, China.

  • Received:2016-07-06 Online:2017-02-18 Published:2017-02-18
  • Contact: * E-mail: dxwfree@126.com
  • Supported by:
    This work was supported by the Forestry Science and Technology Promotion Project of State Forestry Administration of China ([2014]52), and the Desertification (Rocky Desertification) Monitoring Project of State Forestry Administration of China (20150618)

摘要: 以湘西南石漠化地区灌丛植物叶片为研究对象,分析了不同功能群植物以及3种不同石漠化程度(轻度、中度、重度)下植物叶片N、P化学计量特征.结果表明: 湘西南石漠化地区常见植物叶片平均N含量为12.89 g·kg-1,P含量为1.19 g·kg-1,N/P值为11.24,大部分植物生长受到N的限制.不同生活型之间植物叶片N含量为落叶灌木>常绿灌木>一年生草本>多年生草本,P含量与N/P值为落叶灌木>多年生草本.不同科植物之间叶片N、P含量和N/P值差异显著,禾本科植物叶片N、P含量最低,与其他科植物共同受N限制;豆科植物叶片N含量和N/P值最高,主要受P限制.双子叶植物与C3植物叶片N、P含量分别高于单子叶植物与C4植物,N/P值差异均不显著.固氮植物叶片N含量以及N/P值均高于非固氮植物,P含量差异不显著.各样地中植物叶片N、P含量之间的相关性显著,N/P值与N含量的相关性显著,仅与中度石漠化样地P含量差异显著.不同石漠化程度之间植物叶N、P含量以及N/P值差异不显著.

Abstract: In this paper, we took the leaves of shrubland plants in rocky desertification area in Southwestern Hunan as the research object to analyze the nitrogen (N) and phosphorus (P) stoichiometry characteristics for different functional groups and different grades of rocky desertification, i.e., light rocky desertification (LRD), moderate rocky desertification (MRD) and intense rocky desertification (IRD). The results showed that the average contents of N and P were 12.89 and 1.19 g·kg-1, respectively, and N/P was 11.24 in common shrubland plants in the study area, which indicated that the growth of most plants were mainly limited by N. The content of N was declined in order of deciduous shrubs > evergreen shrubs > annual herbs > perennial herbs. The content of P and N/P were higher in deciduous shrubs than in perennial herbs. Significant differences were found among the main families of plants in terms of the contents of N, P and N/P in the study sites. The plants of Gramineae had the lowest contents of N and P, andtheir growth was mostly restricted by N, while Leguminosae had the highest content of N and N/P, and their productivity was majorly controlled by P. The contents of N and P in the leaves were significantly higher in dicotyledon plants and C3 plants than in monocotyledon plants and C4 plants, but the N/P was not significantly diffe-rent between these two plant categories. The nitrogen-fixing plants had higher content of N and N/P than the non-nitrogen-fixing plants, but the P content was not significantly different between these two plant groups. There were significant correlations between contents of N and P, N/P and N in all study plots. No significant correlation was found between N/P and P content in the examined rocky desertification sites, except for that in MRD. There were no significant differences of the contents of N, P and N/P under different grades of rocky desertification.