期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 801, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.149708
关键词
3D EEM; PARAFAC; Biomass decomposition; Paddy soil
资金
- National Natural Science Foundation of China [41977101, 41825021]
- Natural Science Foundation of Jiangsu Province, China [BK20181511, BE2020731, BK20200057]
- Chinese Academy of Sciences
This study revealed the interactions between DOM and periphytic biofilms and their effects on changes in bioactive phosphorus fractions, providing practical information for designing periphytic biofilm based biofertilizers from the perspective of soil DOM.
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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