Linking soil dissolved organic matter characteristics and the temperature sensitivity of soil organic carbon decomposition in the riparian zone of the Three Gorges Reservoir
Soil dissolved organic matter (DOM) is highly sensitive to external interference. However, little attention has been paid on how soil DOM characteristics in the dry period affect the warming response of soil organic carbon (SOC) decomposition in riparian ecosystems under flooding conditions. The tem...
| Main Authors: | , , , , , , |
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Elsevier
2023-10-01
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| Series: | Ecological Indicators |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1470160X2300910X |
| _version_ | 1797683058835456000 |
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| author | Yun Zhao Junjie Lin Shuxun Cheng Kehong Wang Amit Kumar Zhi-Guo Yu Biao Zhu |
| author_facet | Yun Zhao Junjie Lin Shuxun Cheng Kehong Wang Amit Kumar Zhi-Guo Yu Biao Zhu |
| author_sort | Yun Zhao |
| collection | DOAJ |
| description | Soil dissolved organic matter (DOM) is highly sensitive to external interference. However, little attention has been paid on how soil DOM characteristics in the dry period affect the warming response of soil organic carbon (SOC) decomposition in riparian ecosystems under flooding conditions. The temperature sensitivity (Q10) of SOC decomposition was determined by incubating 99 riparian soils under flooding across 11 transects of the Three Gorges Reservoir. Soil DOM characteristics in the dry period were measured by ultraviolet–visible spectroscopy (i.e., a254, a350, SUVA254 and SR) and 3D-fluorescence spectroscopy (such as FI, β:α, BIX, and HIX). The fluorescence components of C1, C3, and C4 were determined by parallel factor analysis. SOC decomposition was sensitive to warming with a higher Q10 value for CH4 (2.34 ± 1.30) and lower for CO2 (1.37 ± 0.23) under flooding. The soil DOM in dry period was mainly autochthonous with FI > 1.9 and 90% of BIX > 0.7. The humification of soil DOM was relatively weak at ∼ 95% of HIX < 0.8. The Q10 value of CO2 was positively correlated with Ln (SUVA254) and Ln (HIX) whereas negatively correlated with Ln (DOC), Ln (a254), and Ln (a350). The Q10 of CH4 was positively related to Ln (HIX), while on the contrary, negatively related to Ln (C4). These variations in Q10 were mainly driven by the aromaticity and humification degree of DOM. Out of all DOM characteristics, the lignin component was the key predictor of the Q10 variation. Overall, findings of this study indicate that soil DOM characteristics in dry period are closely linked with the response of SOC decomposition to warming during the reservoir impoundment. |
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| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-03-12T00:10:00Z |
| publishDate | 2023-10-01 |
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| series | Ecological Indicators |
| spelling | doaj.art-3eaffd261cda43da872258d5d40cbe262023-09-16T05:29:54ZengElsevierEcological Indicators1470-160X2023-10-01154110768Linking soil dissolved organic matter characteristics and the temperature sensitivity of soil organic carbon decomposition in the riparian zone of the Three Gorges ReservoirYun Zhao0Junjie Lin1Shuxun Cheng2Kehong Wang3Amit Kumar4Zhi-Guo Yu5Biao Zhu6School of Environment and Natural Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang 310023, China; Chongqing Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Chongqing 404100, ChinaSchool of Environment and Natural Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang 310023, China; Corresponding authors.Chongqing Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Chongqing 404100, ChinaChongqing Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Chongqing 404100, ChinaSchool of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, ChinaSchool of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, ChinaInstitute of Ecology, College of Urban and Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China; Corresponding authors.Soil dissolved organic matter (DOM) is highly sensitive to external interference. However, little attention has been paid on how soil DOM characteristics in the dry period affect the warming response of soil organic carbon (SOC) decomposition in riparian ecosystems under flooding conditions. The temperature sensitivity (Q10) of SOC decomposition was determined by incubating 99 riparian soils under flooding across 11 transects of the Three Gorges Reservoir. Soil DOM characteristics in the dry period were measured by ultraviolet–visible spectroscopy (i.e., a254, a350, SUVA254 and SR) and 3D-fluorescence spectroscopy (such as FI, β:α, BIX, and HIX). The fluorescence components of C1, C3, and C4 were determined by parallel factor analysis. SOC decomposition was sensitive to warming with a higher Q10 value for CH4 (2.34 ± 1.30) and lower for CO2 (1.37 ± 0.23) under flooding. The soil DOM in dry period was mainly autochthonous with FI > 1.9 and 90% of BIX > 0.7. The humification of soil DOM was relatively weak at ∼ 95% of HIX < 0.8. The Q10 value of CO2 was positively correlated with Ln (SUVA254) and Ln (HIX) whereas negatively correlated with Ln (DOC), Ln (a254), and Ln (a350). The Q10 of CH4 was positively related to Ln (HIX), while on the contrary, negatively related to Ln (C4). These variations in Q10 were mainly driven by the aromaticity and humification degree of DOM. Out of all DOM characteristics, the lignin component was the key predictor of the Q10 variation. Overall, findings of this study indicate that soil DOM characteristics in dry period are closely linked with the response of SOC decomposition to warming during the reservoir impoundment.http://www.sciencedirect.com/science/article/pii/S1470160X2300910XThree Gorges ReservoirRiparian zoneSoil dissolved organic matterDry periodSoil organic carbonTemperature sensitivity |
| spellingShingle | Yun Zhao Junjie Lin Shuxun Cheng Kehong Wang Amit Kumar Zhi-Guo Yu Biao Zhu Linking soil dissolved organic matter characteristics and the temperature sensitivity of soil organic carbon decomposition in the riparian zone of the Three Gorges Reservoir Ecological Indicators Three Gorges Reservoir Riparian zone Soil dissolved organic matter Dry period Soil organic carbon Temperature sensitivity |
| title | Linking soil dissolved organic matter characteristics and the temperature sensitivity of soil organic carbon decomposition in the riparian zone of the Three Gorges Reservoir |
| title_full | Linking soil dissolved organic matter characteristics and the temperature sensitivity of soil organic carbon decomposition in the riparian zone of the Three Gorges Reservoir |
| title_fullStr | Linking soil dissolved organic matter characteristics and the temperature sensitivity of soil organic carbon decomposition in the riparian zone of the Three Gorges Reservoir |
| title_full_unstemmed | Linking soil dissolved organic matter characteristics and the temperature sensitivity of soil organic carbon decomposition in the riparian zone of the Three Gorges Reservoir |
| title_short | Linking soil dissolved organic matter characteristics and the temperature sensitivity of soil organic carbon decomposition in the riparian zone of the Three Gorges Reservoir |
| title_sort | linking soil dissolved organic matter characteristics and the temperature sensitivity of soil organic carbon decomposition in the riparian zone of the three gorges reservoir |
| topic | Three Gorges Reservoir Riparian zone Soil dissolved organic matter Dry period Soil organic carbon Temperature sensitivity |
| url | http://www.sciencedirect.com/science/article/pii/S1470160X2300910X |
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