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Soil microbial C:N ratio is a robust indicator of soil productivity for paddy fields

Maintaining good soil productivity in rice paddies is important for global food security. Numerous methods have been developed to evaluate paddy soil productivity (PSP), most based on soil physiochemical properties and relatively few on biological indices. Here, we used a long-term dataset from expe...

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Autores principales: Li, Yong, Wu, Jinshui, Shen, Jianlin, Liu, Shoulong, Wang, Cong, Chen, Dan, Huang, Tieping, Zhang, Jiabao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5064311/
https://www.ncbi.nlm.nih.gov/pubmed/27739462
http://dx.doi.org/10.1038/srep35266
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author Li, Yong
Wu, Jinshui
Shen, Jianlin
Liu, Shoulong
Wang, Cong
Chen, Dan
Huang, Tieping
Zhang, Jiabao
author_facet Li, Yong
Wu, Jinshui
Shen, Jianlin
Liu, Shoulong
Wang, Cong
Chen, Dan
Huang, Tieping
Zhang, Jiabao
author_sort Li, Yong
collection PubMed
description Maintaining good soil productivity in rice paddies is important for global food security. Numerous methods have been developed to evaluate paddy soil productivity (PSP), most based on soil physiochemical properties and relatively few on biological indices. Here, we used a long-term dataset from experiments on paddy fields at eight county sites and a short-term dataset from a single field experiment in southern China, and aimed at quantifying relationships between PSP and the ratios of carbon (C) to nutrients (N and P) in soil microbial biomass (SMB). In the long-term dataset, SMB variables generally showed stronger correlations with the relative PSP (rPSP) compared to soil chemical properties. Both correlation and variation partitioning analyses suggested that SMB N, P and C:N ratio were good predictors of rPSP. In the short-term dataset, we found a significant, negative correlation of annual rice yield with SMB C:N (r = −0.99), confirming SMB C:N as a robust indicator for PSP. In treatments of the short-term experiment, soil amendment with biochar lowered SMB C:N and improved PSP, while incorporation of rice straw increased SMB C:N and reduced PSP. We conclude that SMB C:N ratio does not only indicate PSP but also helps to identify management practices that improve PSP.
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spelling pubmed-50643112016-10-26 Soil microbial C:N ratio is a robust indicator of soil productivity for paddy fields Li, Yong Wu, Jinshui Shen, Jianlin Liu, Shoulong Wang, Cong Chen, Dan Huang, Tieping Zhang, Jiabao Sci Rep Article Maintaining good soil productivity in rice paddies is important for global food security. Numerous methods have been developed to evaluate paddy soil productivity (PSP), most based on soil physiochemical properties and relatively few on biological indices. Here, we used a long-term dataset from experiments on paddy fields at eight county sites and a short-term dataset from a single field experiment in southern China, and aimed at quantifying relationships between PSP and the ratios of carbon (C) to nutrients (N and P) in soil microbial biomass (SMB). In the long-term dataset, SMB variables generally showed stronger correlations with the relative PSP (rPSP) compared to soil chemical properties. Both correlation and variation partitioning analyses suggested that SMB N, P and C:N ratio were good predictors of rPSP. In the short-term dataset, we found a significant, negative correlation of annual rice yield with SMB C:N (r = −0.99), confirming SMB C:N as a robust indicator for PSP. In treatments of the short-term experiment, soil amendment with biochar lowered SMB C:N and improved PSP, while incorporation of rice straw increased SMB C:N and reduced PSP. We conclude that SMB C:N ratio does not only indicate PSP but also helps to identify management practices that improve PSP. Nature Publishing Group 2016-10-14 /pmc/articles/PMC5064311/ /pubmed/27739462 http://dx.doi.org/10.1038/srep35266 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Li, Yong
Wu, Jinshui
Shen, Jianlin
Liu, Shoulong
Wang, Cong
Chen, Dan
Huang, Tieping
Zhang, Jiabao
Soil microbial C:N ratio is a robust indicator of soil productivity for paddy fields
title Soil microbial C:N ratio is a robust indicator of soil productivity for paddy fields
title_full Soil microbial C:N ratio is a robust indicator of soil productivity for paddy fields
title_fullStr Soil microbial C:N ratio is a robust indicator of soil productivity for paddy fields
title_full_unstemmed Soil microbial C:N ratio is a robust indicator of soil productivity for paddy fields
title_short Soil microbial C:N ratio is a robust indicator of soil productivity for paddy fields
title_sort soil microbial c:n ratio is a robust indicator of soil productivity for paddy fields
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5064311/
https://www.ncbi.nlm.nih.gov/pubmed/27739462
http://dx.doi.org/10.1038/srep35266
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