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干旱胁迫对3种灌木不同器官化学计量特征的影响
引用本文:陈佳瑞,王国梁,孟敏,王润超. 干旱胁迫对3种灌木不同器官化学计量特征的影响[J]. 应用生态学报, 2021, 32(1): 73-81. DOI: 10.13287/j.1001-9332.202101.002
作者姓名:陈佳瑞  王国梁  孟敏  王润超
作者单位: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
基金项目:国家重点研发计划项目(2017YFC0504601);国家科技支撑计划项目(2015BAC01B03)资助。
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...

关 键 词:干旱胁迫  器官  化学计量特征
收稿时间:2020-06-30

Effects of drought stress on the stoichiometric characteristics in different organs of three shrub species
CHEN Jia-rui,WANG Guo-liang,MENG Min,WANG Run-chao. Effects of drought stress on the stoichiometric characteristics in different organs of three shrub species[J]. The journal of applied ecology, 2021, 32(1): 73-81. DOI: 10.13287/j.1001-9332.202101.002
Authors:CHEN Jia-rui  WANG Guo-liang  MENG Min  WANG Run-chao
Affiliation:1.Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shannxi, China;2.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100, Shannxi, China
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.
Keywords:drought stress  organ  stoichiometric characteristics
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