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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, Giovanni ; Li, Hua ; Rossi, Federico ; Li, Dunhai ; Liu, Yongding ; De Philippis, Roberto
通讯作者: De Philippis, R (reprint author), Univ Florence, Dept Agrifood Prod & Environm Sci, Piazzale Cascine 24, I-50144 Florence, Italy.
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
卷: 68, 期:-, 页:62-70
收录类别: SCI
部门归属: [Colica, Giovanni; Rossi, Federico; De Philippis, Roberto] Univ Florence, Dept Agrifood Prod & Environm Sci, I-50144 Florence, Italy; [Li, Hua; Li, Dunhai; Liu, Yongding] Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China; [Li, Hua] Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
资助者: China-Italy Executive Program for Scientific and Technological Cooperation [NRP 9]; National Key Technology R&D Program of China [2009BAC54B01]; Funds for International Cooperation of the University of Florence; Wuhan Science and Technology Bureau; Inner Mongolia Planning Committee on High-tech Industrialization [200720112031]
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.
语种: 英语
ISSN号: 0038-0717
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/20080
Appears in Collections:水环境工程研究中心_期刊论文

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