Effects of Soil Water Stress on Growth, Root and Leaf Traits, and Biomass Allocation of Robinia Pseudoacacia Seedlings

Tang Yang; Wen Zhongming; Wang Yang; Liu Jing

doi:10.13961/j.cnki.stbctb.2019.06.014

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Effects of Soil Water Stress on Growth, Root and Leaf Traits, and Biomass Allocation of Robinia Pseudoacacia Seedlings

- Effects of Soil Water Stress on Growth, Root and Leaf Traits, and Biomass Allocation of Robinia Pseudoacacia Seedlings
- Bulletin of Soiland Water Conservation Vol. 39, Issue 6, Pages: 98-105(2019)
- 作者机构：
  
  1. 西北农林科技大学水土保持研究所, 陕西杨凌,712100
  2. 西北农林科技大学草业与草原学院, 陕西杨凌,712100
  3. 中国科学院教育部水土保持与生态环境研究中心, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2019.06.014
  CLC：
- Published：2019
- 稿件说明：
移动端阅览
Tang Yang, Wen Zhongming, Wang Yang, et al. Effects of Soil Water Stress on Growth, Root and Leaf Traits, and Biomass Allocation of Robinia Pseudoacacia Seedlings[J]. Bulletin of Soiland Water Conservation, 2019, 39(6): 98-105.
DOI：

Tang Yang, Wen Zhongming, Wang Yang, et al. Effects of Soil Water Stress on Growth, Root and Leaf Traits, and Biomass Allocation of Robinia Pseudoacacia Seedlings[J]. Bulletin of Soiland Water Conservation, 2019, 39(6): 98-105. DOI： 10.13961/j.cnki.stbctb.2019.06.014.

摘要

[目的] 探索刺槐幼苗在干旱胁迫下的适应策略，为植被恢复过程中人工刺槐林的造林选址提供科学依据。[方法] 采用盆栽控水实验法，以1年生刺槐幼苗为实验对象，设置4个水分梯度（分别为田间持水量的75%~90%，60%~75%，45%~60%，30%~45%），研究水分胁迫下刺槐幼苗的适应机制。[结果] ①中度（45%~60%）和重度水分胁迫（30%~45%）明显抑制幼苗生长，其株高、地径和冠幅显著低于对照组（75%~90%），轻度水分胁迫（60%~75%）与对照组差异不显著，在实验结束时其生长状态优于对照组；②随土壤水分胁迫程度加深，刺槐幼苗根磷含量升高，比叶面积和比根长减小，叶厚度和叶组织密度增大；③中度（45%~60%）和重度水分胁迫（30%~45%）显著减少了幼苗的生物量积累，提高了幼苗的根冠比。[结论] 刺槐幼苗通过将同化物质相对多的投入到防御组织的策略来适应干旱环境。重度水分胁迫严重抑制幼苗的生长，而在轻度水分胁迫下，幼苗能取得最大生长收益。

Abstract

[Objective] The adaptation strategies of Robinia pseudoacacia seedlings under drought stress were explored

in order to provide support for afforestation site selection of artificial Robinia pseudoacacia forests during vegetation restoration.[Methods]Using the potted water control experiment method

the annual seedlings were used as experimental subjects to study the adaptation mechanism of Robinia pseudoacacia seedlings. Four water gradients were respectively set as follows:75%~90%

60%~75%

45%~60%

and 30%~45% of soil water holding capacity.[Results] ① Moderate water stress(45%~60%) and severe water stress(30%~45%) significantly inhibited the growth of seedling

and the plant height

ground diameter and crown width were significantly lower than those of the control group(75%~90%). ② With the deepening of soil water stress

root phosphorus content

specific leaf area and specific root length decreased

while leaf thickness and leaf tissue density increased in Robinia pseudoacacia seedlings. There was no significant different between mild water stress(60%~75%) and the control group

and the growth state of mild water stress was even better than that of the control group at the end of the experiment. ③ Moderate water stress and severe water stress significantly reduced the biomass accumulation of seedlings and increased the root-shoot ratio of seedlings.[Conclusions] Robinia pseudoacacia seedlings adapts to the arid environment by investing a relatively large amount of assimilated material into the defense organization. Severe water stress inhibited the growth of seedlings seriously

while under mild water stress

seedlings could achieve maximum growth benefit.

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