Saline and Alkaline tolerance of wetland plants — what are the most representative evaluation indicators?

Article

Cheng, R., Zhu, H., Cheng, X., Shutes, B. and Yan, B. 2020. Saline and Alkaline tolerance of wetland plants — what are the most representative evaluation indicators? Sustainability. 12 (5). https://doi.org/10.3390/su12051913
TypeArticle
TitleSaline and Alkaline tolerance of wetland plants — what are the most representative evaluation indicators?
AuthorsCheng, R., Zhu, H., Cheng, X., Shutes, B. and Yan, B.
Abstract

The increasing discharge of wastewater containing inorganic salts, sometimes accompanied by high pH, has been a worldwide environmental problem. Constructed wetlands (CWs) are considered a viable technology for treating saline and/or alkaline wastewater provided that saline-alkaline tolerant plant species are selected and applied. The influence of both saline and alkaline stress on four wetland plant species during their seed germination, early growth, vegetative propagation and continued growth stages was evaluated by three experiments. Principal component analysis (PCA) was conducted for selecting representative indicators for evaluating the saline and alkaline tolerance of plants during vegetative propagation and plant growth stages. The saline and alkaline stress inhibited the vegetative propagation and plant growth of all tested plant species to varying degrees, therein the influences of saline-alkaline stress on plants were more marked than saline stress. The length of new roots, Na+ accumulation in plant tissue, Na+/K+ ratios in aerial tissue and the total dry biomass were selected as most representative indicators for evaluating the saline and alkaline tolerance of plants. Iris sibirica and Lythrum salicaria showed better saline and alkaline tolerance ability among tested species and could be grown in CWs for treating saline and/or alkaline wastewater.

Keywordsaquatic plants, saline-alkaline tolerance, germination, seedlings growth, reproduction, constructed wetlands
PublisherMDPI
JournalSustainability
ISSN2071-1050
Electronic2071-1050
Publication dates
Online03 Mar 2020
Print03 Mar 2020
Publication process dates
Deposited06 Mar 2020
Accepted29 Feb 2020
Output statusPublished
Publisher's version
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Copyright Statement

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.

Digital Object Identifier (DOI)https://doi.org/10.3390/su12051913
LanguageEnglish
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