首页|Soil microbial activity and community structure as affected by exposure to chloride and chloride-sulfate salts

Soil microbial activity and community structure as affected by exposure to chloride and chloride-sulfate salts

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Mixed or chloride salty ions dominate in saline soils,and exert wide-ranging adversely affect on soil biological processes and soil functions.The objectives of this study were to (1) explore the impacts of mixed (0,3,6,10,20 and 40 g Cl-/SO42-salt/kg dry soil) and chloride (0,1.5,3,5,8 and 15 g Cl-salt/kg dry soil) salts on soil enzyme activities,soil physiological functional (Biolog) profiles and microbial community structure by using soil enzymatic,Biolog-Eco microplates as well as denaturing gradient gel electrophoresis (DEEG) methods,and (2) determine the threshold concentration of soil electronic conductivity (EC1∶5) on maintaining the functional and structural diversity of soil microbial community.The addition of either C1-or mixed Cl-/SO42-salt obviously increased soil EC,but adversely affected soil biological activities including soil invertase activity,soil microbial biomass carbon (MBC) and substrate-induced respiration (SIR).C1-salt showed a greater deleterious influence than mixed Cl-/SO42-salt on soil enzymes and MBC,e.g.,the higher soil MBC consistently appeared with C1-/SO42-instead of C1-treated soil.Meanwhile,we found that SIR was more reliable than soil basal respiration (SBR) on explaining the changes of soil biological activity responsive to salt disturbance.In addition,microbial community structures of the soil bacteria,fungi,and Bacillus were obviously affected by both salt types and soil EC levels,and its diversity increased with increasing of mixed C1-/SO42-salt rates,and then sharply declined down after it reached critical point.Moreover,the diversity of fungal community was more sensitive to the mixed salt addition than other groups.The response of soil physiological profiles (Biolog) followed a dose-response pattern with Cl-(R2=0.83) or mixed C1-/SO42-(R2=0.89) salt.The critical threshold concentrations of salts for soil physiological function were 0.45 dS/m for Cl-and 1.26 dS/m for C1-/SO42-,and those for soil microbial community structural diversity were 0.70 dS/m for Cl-and 1.75 dS/m for C1-/SO42-.

soil biological activitymicrobial diversitychloride saltmixed saltthreshold concentration

ZHANG Qianqian、Steven A WAKELIN、LIANG Yongchao、CHU Guixin

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College of Life Science, Shaoxing University, Zhejiang 312000, China

Department of Resources and Environmental Science, College of Agriculture/the Key Laboratory of Oasis Eco-agriculture of the Xinjiang Production and Construction Corps, Shihezi University, Shihezi 832003, China

College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China

Department of Forest Systems, Scion Research, Christchurch 8540, New Zealand

Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China

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This work was jointly supported by the National Key Technologies Research and Development ProgramNational Natural Science Foundation of China

2016YFC050140441461064

2018

干旱区科学
中国科学院新疆生态与地理研究所,科学出版社

干旱区科学

CSTPCDCSCDSCI
影响因子：1.743
ISSN：1674-6767
年,卷(期)：2018.10(5)
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