Soil Texture Alters the Impact of Salinity on Carbon Mineralization
Soil salinization typically inhibits the ability of decomposer organisms to utilize soil organic matter, and an increase in soil clay content can mediate the negative effect of salinity on carbon (C) mineralization. However, the interactive effects of soil salt concentrations and properties on C min...
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MDPI AG
2021-01-01
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author | Ruihuan She Yongxiang Yu Chaorong Ge Huaiying Yao |
author_facet | Ruihuan She Yongxiang Yu Chaorong Ge Huaiying Yao |
author_sort | Ruihuan She |
collection | DOAJ |
description | Soil salinization typically inhibits the ability of decomposer organisms to utilize soil organic matter, and an increase in soil clay content can mediate the negative effect of salinity on carbon (C) mineralization. However, the interactive effects of soil salt concentrations and properties on C mineralization remain uncertain. In this study, a laboratory experiment was performed to investigate the interactive effects of soil salt content (0.1%, 0.3%, 0.6% and 1.0%) and texture (sandy loam, sandy clay loam and silty clay soil with 6.0%, 23.9% and 40.6% clay content, respectively) on C mineralization and microbial community composition after cotton straw addition. With increasing soil salinity, carbon dioxide (CO<sub>2</sub>) emissions from the three soils decreased, but the effect of soil salinity on the decomposition of soil organic carbon varied with soil texture. Cumulative CO<sub>2</sub> emissions in the coarse-textured (sandy loam and sandy clay loam) soils were more affected by salinity than those in the fine-textured (silty clay) soil. This difference was probably due to the differing responses of labile and resistant organic compounds to salinity across different soil texture. Increased salinity decreased the decomposition of the stable C pool in the coarse-textured soil, by reducing the proportion of fungi to bacteria, whereas it decreased the mineralization of the active C pool in the fine-textured soil through decreasing the Gram-positive bacterial population. Overall, our results suggest that soil texture controlled the negative effect of salinity on C mineralization through regulating the soil microbial community composition. |
first_indexed | 2024-03-09T05:18:00Z |
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id | doaj.art-440e93d6ea1140dbbad2d3d53cd5b29d |
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issn | 2073-4395 |
language | English |
last_indexed | 2024-03-09T05:18:00Z |
publishDate | 2021-01-01 |
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series | Agronomy |
spelling | doaj.art-440e93d6ea1140dbbad2d3d53cd5b29d2023-12-03T12:43:33ZengMDPI AGAgronomy2073-43952021-01-0111112810.3390/agronomy11010128Soil Texture Alters the Impact of Salinity on Carbon MineralizationRuihuan She0Yongxiang Yu1Chaorong Ge2Huaiying Yao3Research Center for Environmental Ecology and Engineering, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, 206 Guanggu 1st Road, Wuhan 430205, ChinaResearch Center for Environmental Ecology and Engineering, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, 206 Guanggu 1st Road, Wuhan 430205, ChinaResearch Center for Environmental Ecology and Engineering, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, 206 Guanggu 1st Road, Wuhan 430205, ChinaResearch Center for Environmental Ecology and Engineering, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, 206 Guanggu 1st Road, Wuhan 430205, ChinaSoil salinization typically inhibits the ability of decomposer organisms to utilize soil organic matter, and an increase in soil clay content can mediate the negative effect of salinity on carbon (C) mineralization. However, the interactive effects of soil salt concentrations and properties on C mineralization remain uncertain. In this study, a laboratory experiment was performed to investigate the interactive effects of soil salt content (0.1%, 0.3%, 0.6% and 1.0%) and texture (sandy loam, sandy clay loam and silty clay soil with 6.0%, 23.9% and 40.6% clay content, respectively) on C mineralization and microbial community composition after cotton straw addition. With increasing soil salinity, carbon dioxide (CO<sub>2</sub>) emissions from the three soils decreased, but the effect of soil salinity on the decomposition of soil organic carbon varied with soil texture. Cumulative CO<sub>2</sub> emissions in the coarse-textured (sandy loam and sandy clay loam) soils were more affected by salinity than those in the fine-textured (silty clay) soil. This difference was probably due to the differing responses of labile and resistant organic compounds to salinity across different soil texture. Increased salinity decreased the decomposition of the stable C pool in the coarse-textured soil, by reducing the proportion of fungi to bacteria, whereas it decreased the mineralization of the active C pool in the fine-textured soil through decreasing the Gram-positive bacterial population. Overall, our results suggest that soil texture controlled the negative effect of salinity on C mineralization through regulating the soil microbial community composition.https://www.mdpi.com/2073-4395/11/1/128soil salinizationclay contentmicrobial respirationbacteriafungi |
spellingShingle | Ruihuan She Yongxiang Yu Chaorong Ge Huaiying Yao Soil Texture Alters the Impact of Salinity on Carbon Mineralization Agronomy soil salinization clay content microbial respiration bacteria fungi |
title | Soil Texture Alters the Impact of Salinity on Carbon Mineralization |
title_full | Soil Texture Alters the Impact of Salinity on Carbon Mineralization |
title_fullStr | Soil Texture Alters the Impact of Salinity on Carbon Mineralization |
title_full_unstemmed | Soil Texture Alters the Impact of Salinity on Carbon Mineralization |
title_short | Soil Texture Alters the Impact of Salinity on Carbon Mineralization |
title_sort | soil texture alters the impact of salinity on carbon mineralization |
topic | soil salinization clay content microbial respiration bacteria fungi |
url | https://www.mdpi.com/2073-4395/11/1/128 |
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