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An integrative influence of saline water irrigation and fertilization on the structure of soil bacterial communities

Published online by Cambridge University Press:  26 March 2020

L. J. Chen ,
C. S. Li ,
Q. Feng Open the ORCID record for Q. Feng [Opens in a new window] ,
Y. P. Wei ,
Y. Zhao ,
M. Zhu  and
R. C. Deo
L. J. Chen
Affiliation:
Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou730000, China School of Earth and Environmental Sciences, the University of Queensland, Brisbane4072, Australia
C. S. Li
Affiliation:
Shapotou Desert Research and Experimental Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou730000, China University of Chinese Academy of Sciences, Beijing100049, China
Q. Feng*
Affiliation:
Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou730000, China
Y. P. Wei
Affiliation:
School of Earth and Environmental Sciences, the University of Queensland, Brisbane4072, Australia
Y. Zhao
Affiliation:
School of Earth and Environmental Sciences, the University of Queensland, Brisbane4072, Australia
M. Zhu
Affiliation:
Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou730000, China
R. C. Deo
Affiliation:
Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou730000, China School of Agricultural, Computational and Environmental Sciences, Centre for Applied Climate Science, Institute of Agriculture and Environment, University of Southern Queensland, Springfield, QLD4300, Australia
*
Author for correspondence: Q. Feng, E-mail: [email protected]
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Abstract

Although numerous studies have investigated the individual effects of salinity, irrigation and fertilization on soil microbial communities, relatively less attention has been paid to their combined influences, especially using molecular techniques. Based on the field of orthogonal designed test and deoxyribonucleic acid sequencing technology, the effects of saline water irrigation amount, salinity level of irrigation water and nitrogen (N) fertilizer rate on soil bacterial community structure were investigated. The results showed that the irrigation amount was the most dominant factor in determining the bacterial richness and diversity, followed by the irrigation water salinity and N fertilizer rate. The values of Chao1 estimator, abundance-based coverage estimator and Shannon indices decreased with an increase in irrigation amount while increased and then decreased with an increase in irrigation water salinity and N fertilizer rate. The highest soil bacterial richness and diversity were obtained under the least irrigation amount (25 mm), medium irrigation water salinity (4.75 dS/m) and medium N fertilizer rate (350 kg/ha). However, different bacterial phyla were found to respond distinctively to these three factors: irrigation amount significantly affected the relative abundances of Proteobacteria and Chloroflexi; irrigation water salinity mostly affected the members of Actinobacteria, Gemmatimonadetes and Acidobacteria; and N fertilizer rate mainly influenced the Bacteroidetes' abundance. The results presented here revealed that the assessment of soil microbial processes under combined irrigation and fertilization treatments needed to be more careful as more variable consequences would be established by comparing with the influences based on an individual factor, such as irrigation amount or N fertilizer rate.

Keywords

Bacterial community structurefertilizationirrigation amountmicrobial diversitysalinity
Type
Crops and Soils Research Paper
Information
The Journal of Agricultural Science , Volume 157 , Issue 9-10 , December 2019 , pp. 693 - 700
Copyright
Copyright © Cambridge University Press 2020

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