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Interactions between periphytic biofilms and dissolved organic matter at soil-water interface and the consequent effects on soil phosphorus fraction changes

文献类型： 外文期刊

作者： Liu, Junzhuo 1 ; Lu, Haiying 3 ; Wu, Lirong 1 ; Kerr, Philip G. 4 ; Wu, Yonghong 1 ;

作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, 71 East Beijing Rd, Nanjing 210008, Peoples R China

2.Minist Water Resources Peoples Republ China, Zigui Three Gorges Reservoir Ecosyst Observat & R, Yichang 443605, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Agr Resource & Environm, Salt Soil Agr Ctr, Key Lab Agr Environm Lower Reaches Yangtze River, 50 Zhongling Rd, Nanjing 210014, Peoples R China

4.Charles Sturt Univ, Sch Dent & Med Sci, Boorooma St, Wagga Wagga, NSW 2678, Australia

关键词： 3D EEM; PARAFAC; Biomass decomposition; Paddy soil

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2021 年 801 卷

页码：

收录情况： SCI

摘要： Dissolved organic matter (DOM) plays vital roles in carbon and other nutrient transformation at soil-water interfaces (SWI) in paddy fields. It is associated with the growth and withering of periphytic biofilms. However, the interactions between DOM and periphytic biofilms remain largely unknown. In this study, a microcosm experiment with different initial DOM contents elucidated that the biomass, and biomass nitrogen and phosphorus contents were greatly influenced by humic-like substances (C2 and C3), while the growth of periphytic biofilms increased the contents of humic-like (C1 and C2) and tryptophan-like substances (C5) in soil. Moreover, the decomposition of periphytic biofilms significantly increased soil pH, DOM, C2, C3 and C5 contents, but caused decrease in Eh, with consequent reduce in water soluble phosphorus (WSP) and release of algal available phosphorus (AAP). Results from this study revealed how DOM interacts with periphytic biofilms and the consequent effects on changes of bioactive phosphorus fractions, and provide practical information for designing periphytic biofilm based biofertilizer from the perspective of soil DOM. (c) 2021 Elsevier B.V. All rights reserved.

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