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Impacts of long-term fertilization on the soil microbial communities in double-cropped paddy fields

Published online by Cambridge University Press:  16 October 2018

H. M. Tang*
Affiliation:
Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
Y. L. Xu
Affiliation:
Hunan Biological and Electromechanical Polytechnic, Changsha 410127, China
X. P. Xiao
Affiliation:
Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
C. Li
Affiliation:
Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
W. Y. Li
Affiliation:
Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
K. K. Cheng
Affiliation:
Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
X. C. Pan
Affiliation:
Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
G. Sun
Affiliation:
Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
*
Author for correspondence: H. M. Tang, E-mail: tanghaiming66@163.com

Abstract

The response of soil microbial communities to soil quality changes is a sensitive indicator of soil ecosystem health. The current work investigated soil microbial communities under different fertilization treatments in a 31-year experiment using the phospholipid fatty acid (PLFA) profile method. The experiment consisted of five fertilization treatments: without fertilizer input (CK), chemical fertilizer alone (MF), rice (Oryza sativa L.) straw residue and chemical fertilizer (RF), low manure rate and chemical fertilizer (LOM), and high manure rate and chemical fertilizer (HOM). Soil samples were collected from the plough layer and results indicated that the content of PLFAs were increased in all fertilization treatments compared with the control. The iC15:0 fatty acids increased significantly in MF treatment but decreased in RF, LOM and HOM, while aC15:0 fatty acids increased in these three treatments. Principal component (PC) analysis was conducted to determine factors defining soil microbial community structure using the 21 PLFAs detected in all treatments: the first and second PCs explained 89.8% of the total variance. All unsaturated and cyclopropyl PLFAs except C12:0 and C15:0 were highly weighted on the first PC. The first and second PC also explained 87.1% of the total variance among all fertilization treatments. There was no difference in the first and second PC between RF and HOM treatments. The results indicated that long-term combined application of straw residue or organic manure with chemical fertilizer practices improved soil microbial community structure more than the mineral fertilizer treatment in double-cropped paddy fields in Southern China.

Type
Crops and Soils Research Paper
Copyright
Copyright © Cambridge University Press 2018 

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