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题名: Microbial secreted exopolysaccharides affect the hydrological behavior of induced biological soil crusts in desert sandy soils
作者: Colica, Giovanni1; Li, Hua2, 3; Rossi, Federico1; Li, Dunhai2; Liu, Yongding2; De Philippis, Roberto1
通讯作者: De Philippis, R.(roberto.dephilippis@unifi.it)
关键词: Hydraulic conductivity ; Moisture uptake ; Water retaining capability ; Exocellular polysaccharides ; Induced biological soil crusts ; High molecular weight carbohydrates ; Low molecular weight carbohydrates ; Cyanobacteria ; Microbial community
刊名: SOIL BIOLOGY & BIOCHEMISTRY
发表日期: 2014
DOI: 10.1016/j.soilbio.2013.09.017
卷: 68, 期:-, 页:62-70
收录类别: SCI
文章类型: Article
部门归属: (1) Department of Agrifood Production and Environmental Sciences, University of Florence, Piazzale delle Cascine 24, Firenze I-50144, Italy; (2) Institute of Hydrobiology, Chinese Academy of Sciences, 7 South Donghu Road, Wuhan 430072, China; (3) Graduate University of Chinese Academy of Sciences, Beijing 100039, China; (4) Earth and Life Institute (ELI), Group of Bioengineering (GEBI), Universite Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Soil Science
研究领域[WOS]: Agriculture
摘要: The effect of the presence of microbial secreted exopolysaccharides (EPSs) on the hydraulic conductivity, water capture and moisture retaining capabilities of Induced Biological Soil Crusts (IBSCs) was investigated. In the experimental sites under study, located in Hobq Desert (China), the formation of these IBSCs was induced three to eight years before the tests by a massive inoculation in sandy soils of mixed cultures of Microcoleus vaginatus and Scytonema javanicum. In all the sites under study, the IBSCs showed to be well consolidated and differently developed in relation with their age. All the crust samples showed a significant content of EPSs, which contributed to the structure of the crusts. The hydraulic conductivity (HC) was significantly lower in the IBSCs than in the underlying bare soil and a statistically significant negative correlation between HC and the amount of high molecular weight (>100kDa; HMW) and of low molecular weight (<100kDa; LMW) carbohydrates in IBSCs was found. The capability of the crusts to retain moisture, coupled with the preservation of their structural integrity, was found to be positively correlated with the amount of total and of HMW carbohydrates in IBSCs. The uptake of atmospheric humidity showed a positive correlation with the amount of LMW carbohydrates in destructured IBSCs. In conclusion, this study showed the crucial role played by the EPSs of IBSCs in trapping and retaining humidity in sandy soils, thus increasing the water availability in the first layers of sandy soils and reducing water infiltration, protecting the soil from erosion. © 2013 Elsevier Ltd.
英文摘要: The effect of the presence of microbial secreted exopolysaccharides (EPSs) on the hydraulic conductivity, water capture and moisture retaining capabilities of Induced Biological Soil Crusts (IBSCs) was investigated. In the experimental sites under study, located in Hobq Desert (China), the formation of these IBSCs was induced three to eight years before the tests by a massive inoculation in sandy soils of mixed cultures of Microcoleus vaginatus and Scytonema javanicum. In all the sites under study, the IBSCs showed to be well consolidated and differently developed in relation with their age. All the crust samples showed a significant content of EPSs, which contributed to the structure of the crusts. The hydraulic conductivity (HC) was significantly lower in the IBSCs than in the underlying bare soil and a statistically significant negative correlation between HC and the amount of high molecular weight (>100 kDa; HMW) and of low molecular weight (<100 kDa; LMW) carbohydrates in IBSCs was found. The capability of the crusts to retain moisture, coupled with the preservation of their structural integrity, was found to be positively correlated with the amount of total and of HMW carbohydrates in IBSCs. The uptake of atmospheric humidity showed a positive correlation with the amount of LMW carbohydrates in destructured IBSCs. In conclusion, this study showed the crucial role played by the EPSs of IBSCs in trapping and retaining humidity in sandy soils, thus increasing the water availability in the first layers of sandy soils and reducing water infiltration, protecting the soil from erosion. (C) 2013 Elsevier Ltd. All rights reserved.
关键词[WOS]: ALGAL CRUSTS ; CYANOBACTERIAL EXOPOLYSACCHARIDES ; HYDRAULIC CONDUCTIVITY ; ECOSYSTEM PROCESSES ; INNER-MONGOLIA ; WATER EROSION ; STABILITY ; GLOMALIN ; BIOFILMS ; SUBSTANCES
语种: 英语
WOS记录号: WOS:000329536200009
ISSN号: 0038-0717
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/19940
Appears in Collections:水环境工程研究中心_期刊论文

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作者单位: 1.Univ Florence, Dept Agrifood Prod & Environm Sci, I-50144 Florence, Italy
2.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
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