Effects of straw amendment on the bioavailability of selenite in soil and its mechanisms
Dissolved organic matter (DOM) released by straw returning for decomposition interacts with selenium (Se) in soil, which affects the speciation distribution of Se and its bioavailability. However, the relative mechanisms involved are slightly understood. This study investigated the effects of straw-...
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Elsevier
2025-01-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651324016543 |
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| author | Mingxing Qi Dan Wang Hui Zhai Fei Zhou Hao Wu Wanchen Zhao Rongxin Ren Jingyi Shi Dongli Liang |
| author_facet | Mingxing Qi Dan Wang Hui Zhai Fei Zhou Hao Wu Wanchen Zhao Rongxin Ren Jingyi Shi Dongli Liang |
| author_sort | Mingxing Qi |
| collection | DOAJ |
| description | Dissolved organic matter (DOM) released by straw returning for decomposition interacts with selenium (Se) in soil, which affects the speciation distribution of Se and its bioavailability. However, the relative mechanisms involved are slightly understood. This study investigated the effects of straw-derived DOM on two levels of exogenous selenite (low-Se and high-Se treatments) in two types of soil with distinct pH. Interactions between DOM and Se were revealed through three-dimensional excitation emission matrix (3D-EEM) fluorescence spectroscopy and two-dimensional correlation spectroscopy (2D-COS). Results showed that straw amendment significantly enhanced selenite bioavailability in alkaline Lou soil regardless of Se application rates (p < 0.05). However, only the high-Se treatment generated remarkable Se content in wheat grains in acidic krasnozems (p < 0.05). Selenite predominantly incorporated with phenolic and etheric C–O functional groups of DOM in soil, which mainly existed in aromatic DOM such as humic acid (HA). Consequently, HA–Se was more likely to form in krasnozems enriched with HA. 2D-COS evidenced that HA mineralization promoted Se bioavailability in krasnozems with high-Se treatment. After selenite complexed with saturated and unsaturated aliphatic carboxyl groups (CO) of DOM, it formed Hy–Se and FA–Se in Lou soil, which could be directly absorbed by wheat roots. Therefore, the composition and functional group reaction sequences of DOM in different soils manipulated selenite bioavailability in soil. These findings could provide a basis for regulating Se bioavailability during biofortification in soils. |
| format | Article |
| id | doaj-art-503b76645c0d46dca397fec4512edce5 |
| institution | Kabale University |
| issn | 0147-6513 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
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| series | Ecotoxicology and Environmental Safety |
| spelling | doaj-art-503b76645c0d46dca397fec4512edce52025-02-12T05:29:52ZengElsevierEcotoxicology and Environmental Safety0147-65132025-01-01290117578Effects of straw amendment on the bioavailability of selenite in soil and its mechanismsMingxing Qi0Dan Wang1Hui Zhai2Fei Zhou3Hao Wu4Wanchen Zhao5Rongxin Ren6Jingyi Shi7Dongli Liang8College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan 637009, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Oasis Ministry of Education, College of Ecology and Environment, Xinjiang University, Urumqi 830017, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi 712100, China; Corresponding author at: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, ChinaDissolved organic matter (DOM) released by straw returning for decomposition interacts with selenium (Se) in soil, which affects the speciation distribution of Se and its bioavailability. However, the relative mechanisms involved are slightly understood. This study investigated the effects of straw-derived DOM on two levels of exogenous selenite (low-Se and high-Se treatments) in two types of soil with distinct pH. Interactions between DOM and Se were revealed through three-dimensional excitation emission matrix (3D-EEM) fluorescence spectroscopy and two-dimensional correlation spectroscopy (2D-COS). Results showed that straw amendment significantly enhanced selenite bioavailability in alkaline Lou soil regardless of Se application rates (p < 0.05). However, only the high-Se treatment generated remarkable Se content in wheat grains in acidic krasnozems (p < 0.05). Selenite predominantly incorporated with phenolic and etheric C–O functional groups of DOM in soil, which mainly existed in aromatic DOM such as humic acid (HA). Consequently, HA–Se was more likely to form in krasnozems enriched with HA. 2D-COS evidenced that HA mineralization promoted Se bioavailability in krasnozems with high-Se treatment. After selenite complexed with saturated and unsaturated aliphatic carboxyl groups (CO) of DOM, it formed Hy–Se and FA–Se in Lou soil, which could be directly absorbed by wheat roots. Therefore, the composition and functional group reaction sequences of DOM in different soils manipulated selenite bioavailability in soil. These findings could provide a basis for regulating Se bioavailability during biofortification in soils.http://www.sciencedirect.com/science/article/pii/S0147651324016543SeleniteStraw amendmentDOM componentsFunctional groupBioavailability |
| spellingShingle | Mingxing Qi Dan Wang Hui Zhai Fei Zhou Hao Wu Wanchen Zhao Rongxin Ren Jingyi Shi Dongli Liang Effects of straw amendment on the bioavailability of selenite in soil and its mechanisms Ecotoxicology and Environmental Safety Selenite Straw amendment DOM components Functional group Bioavailability |
| title | Effects of straw amendment on the bioavailability of selenite in soil and its mechanisms |
| title_full | Effects of straw amendment on the bioavailability of selenite in soil and its mechanisms |
| title_fullStr | Effects of straw amendment on the bioavailability of selenite in soil and its mechanisms |
| title_full_unstemmed | Effects of straw amendment on the bioavailability of selenite in soil and its mechanisms |
| title_short | Effects of straw amendment on the bioavailability of selenite in soil and its mechanisms |
| title_sort | effects of straw amendment on the bioavailability of selenite in soil and its mechanisms |
| topic | Selenite Straw amendment DOM components Functional group Bioavailability |
| url | http://www.sciencedirect.com/science/article/pii/S0147651324016543 |
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