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应用生态学报 ›› 2021, Vol. 32 ›› Issue (1): 73-81.doi: 10.13287/j.1001-9332.202101.002

• 研究论文 • 上一篇    下一篇

干旱胁迫对3种灌木不同器官化学计量特征的影响

陈佳瑞1, 王国梁1,2*, 孟敏1, 王润超1   

  1. 1西北农林科技大学水土保持研究所, 陕西杨凌 712100;
    2中国科学院水利部水土保持研究所, 陕西杨凌 712100
  • 收稿日期:2020-06-30 接受日期:2020-10-15 出版日期:2021-01-15 发布日期:2021-07-15
  • 通讯作者: * E-mail: glwang@nwsuaf.edu.cn
  • 作者简介:陈佳瑞, 女, 1995年生, 硕士研究生。主要从事干旱胁迫下植物化学计量研究。E-mail: 1421273821.@qq.com
  • 基金资助:
    国家重点研发计划项目(2017YFC0504601)和国家科技支撑计划项目(2015BAC01B03)

Effects of drought stress on the stoichiometric characteristics in different organs of three shrub species

CHEN Jia-rui1, WANG Guo-liang1,2*, MENG Min1, WANG Run-chao1   

  1. 1Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shannxi, China;
    2Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100, Shannxi, China
  • Received:2020-06-30 Accepted:2020-10-15 Online:2021-01-15 Published:2021-07-15
  • Contact: * E-mail: glwang@nwsuaf.edu.cn
  • Supported by:
    National Key R&D Program of China (2017YFC0504601) and the National Science and Technology Support Project of China (2015BAC01B03).

摘要: 采用盆栽控水试验,研究了3个水分处理,即田间持水量(FC)的(75±5)%、(55±5)%和(35±5)%,对丁香、黄刺梅、连翘的叶、茎、极细根(0~1 mm)、细根(1~2 mm)和粗根(>2 mm)化学计量特征的影响。结果表明: 3种灌木相同器官间氮(N)和磷(P)含量以及C∶N、C∶P、N∶P均存在显著差异。随着干旱胁迫的加剧,3种灌木各器官C含量总体上无显著变化;叶片N含量呈增加趋势,茎N含量逐渐下降,极细根和细根N含量均呈先上升后下降的趋势;叶片、茎P 含量呈降低趋势,极细根和细根P含量呈先增加后下降的趋势。3种灌木在干旱胁迫下叶C∶N呈降低趋势,叶和茎C∶P、N∶P均呈增加趋势。干旱胁迫对极细根C∶N和叶C∶P、N∶P影响最大,而对粗根C∶N、N∶P以及极细根C∶P的影响最小。土壤C、N含量与灌木各器官中C、N、P含量无显著相关性,但土壤P含量与叶和根系C、N、P含量均显著相关。土壤中相对缺乏的P是影响灌木器官化学计量特征的最重要因素。干旱对不同灌木不同器官化学计量的影响不同,叶和极细根的化学计量较其他器官对干旱胁迫更加敏感。干旱可能主要通过影响灌木对土壤中养分P的吸收和在不同器官中的分配,进而影响灌木不同器官的化学计量特征,尤其是与P相关的化学计量特征。

关键词: 干旱胁迫, 器官, 化学计量特征

Abstract: In order to explore how water stress affects the stoichiometric characteristics in leaves, stems, very fine roots (0-1 mm), fine roots (1-2 mm) and thick roots (>2 mm) of three shrub species, we studied the effects of three water treatments [(75±5)%, (55±5)% and (35±5)% of field water capacity (FC)] on the stoichiometric characteristics of different organs of Syringa oblata, Rosa xanthina and Forsythia suspensa in a pot experiment. The results showed that there were significant differences in nitrogen (N) and phosphorus (P) contents, C:N, C:P and N:P of the same organ among the three species. With the intensification of drought stress, there was no significant change of C content in all organs of the three species. The N content increased in leaves, but decreased gradually in stems. The N content in very fine roots and fine roots increased first and then decreased. The P content decreased in leaves and stems, while increased first and then decreased in very fine roots and fine roots. Under drought stress, leaf C:N decreased, C:P and N:P of leaf and stem increased. There was the strongest effect of drought stress on the C:N of very fine roots and C:P and N:P of leaves. There was the least effect of drought stress on C:N, N:P of thick roots and C:P of very fine roots. There was no significant correlation between the contents of C, N in soil and the contents of C, N and P in shrub organs, but soil P content was significantly correlated with the contents of C, N and P in leaves and roots. It was concluded that the relative P limitation in soil was the most important factor affecting the stoichiometric characteristics of shrub organs. Drought had different effects on the stoichiometry of different organs in different shrub species. The stoichio-metry of leaves and very fine roots was more sensitive to drought stress than that of other organs. Drought might affect the stoichiometric characteristics especially related to P in different organs of shrubs, mainly by affecting plant absorption of soil P and its distribution in different organs.

Key words: drought stress, organ, stoichiometric characteristics