Soil moisture and salt ionic composition effects on species distribution and diversity in semiarid inland saline habitats, northwestern China

Original Article
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Abstract

Salinization is one of the main types causing land desertification in arid and semi-arid regions. Little is known about the impacts of salinization on the distribution and diversity of plant species, especially in semiarid inland saline habitats. We established a total of 40 sampling plots to determine plant community (floristic composition, species abundance, cover, frequency, and aboveground biomass) and soil characteristics (moisture, pH, electrical conductivity (EC), and the contents of Na+, K+, Ca2+, Mg2+, Cl, SO42− and HCO3). The TWINSPAN method was used to distinguish plant communities, by which three plant communities (I, II, III) were identified, namely Artemisia scoparia + Agropyron cristatum + Sophora alopecuroides (I), Kalidium gracile + Atriplex centralasiatica (II), and Salicornia europaea + Suaeda salsa (III). From I to III, the indices reflecting species diversity all decreased except for Pielou’s index of evenness, while the aboveground biomass and cover increased; the characteristic indices of soil moisture, EC, the contents of Na+, K+, Ca2+, Mg2+, Cl, SO42− and total dissolved salts (TDS) significantly increased, while the Ca2+/Na+, K+/Na+ ratios and HCO3 content significantly decreased. Canonical correspondence analysis (CCA) showed that the most important environmental factors influencing species distribution were: soil moisture, SO42−, K+/Na+ and pH. Stepwise multiple-regression analysis indicated that species richness was correlated mainly with TDS and moisture. These results also suggested that vegetation can be used as a proxy indicating soil salt conditions, and their relationships can further provide important information for the improvement of salt-affected soil’s management and salt-tolerant species utilization in environmental restoration.

Keywords

Soil moisture Salt ionic composition Species composition Species richness Canonical correspondence analysis (CCA) 

Notes

Acknowledgements

This study was financially supported by the National Natural Science Foundation of China subsidization project (Grant No. 41471435) and “Ecological restoration technology application in inland river basin of Silk road economic belt” project from sciences technology service network planning in Cold and arid regions environmental and engineering research institute, Chinese academy (Grant No. HHS-TSS-STS-1503). The authors are very grateful to the anonymous reviewers and editors for their critical review and comments which helped to improve the manuscript.

Supplementary material

11284_2018_1570_MOESM1_ESM.docx (21 kb)
Supplementary material 1 (DOCX 20 kb)

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© The Ecological Society of Japan 2018

Authors and Affiliations

  1. 1.Linze Inland River Basin Research Station, Key Laboratory of Inland River Ecohydrology, Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouChina
  2. 2.University of Chinese Academy of SciencesBeijingChina

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