Hydrologic Regime Determines Catchment‐Scale Dissolved Carbon Export Patterns
Abstract Hydrologic regimes are affecting terrestrial carbon transformation, chemical weathering and lateral transport. However, its impacts on dissolved carbon export patterns remains elusive. In this study, we collected a 2‐year high‐frequency dissolved inorganic (DIC) and organic carbon (DOC) dat...
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| Format: | Article |
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Wiley
2025-03-01
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| Series: | Water Resources Research |
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| Online Access: | https://doi.org/10.1029/2024WR038221 |
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| author | Xiao Li Jian Wang Wei Yin Jianfeng Xu Haibing Xiao Hongying Zhao Yongyong Shi Lei Wang Rui Hao Haiyan Li Yiming Huang Hai Jiang Zhihua Shi |
| author_facet | Xiao Li Jian Wang Wei Yin Jianfeng Xu Haibing Xiao Hongying Zhao Yongyong Shi Lei Wang Rui Hao Haiyan Li Yiming Huang Hai Jiang Zhihua Shi |
| author_sort | Xiao Li |
| collection | DOAJ |
| description | Abstract Hydrologic regimes are affecting terrestrial carbon transformation, chemical weathering and lateral transport. However, its impacts on dissolved carbon export patterns remains elusive. In this study, we collected a 2‐year high‐frequency dissolved inorganic (DIC) and organic carbon (DOC) dataset, namely a wet year (Rainfall = 1,158 mm) and a dry year (Rainfall = 603 mm). The results showed that drought led to a significant decrease in dissolved carbon concentration and discharge during the monitoring period. During non‐storm periods, DIC and DOC shifted from dilution and chemostatic to enrichment patterns from wet to dry years, respectively. However, the export patterns were reversed during storm periods. DIC and DOC export patterns in wet year were dominated by dilution and chemostatic, respectively, while both patterns were dominated by dilution in dry year. Structural equation models revealed that the aridity index and temperature may affect dissolved carbon export patterns. We further classified storm events into three major types and conceptualized catchment‐scale transport mechanisms for dissolved carbon. Dry‐AMCs events result in DIC dilution and DOC chemostatic behavior, whereas Wet‐AMCs events result in DIC chemostatic and DOC enrichment behavior due to increased hydrological connectivity. The third type corresponds to extreme events, where larger overland flow often results in DIC dilution but DOC enrichment behavior. These findings reveal the predominant role of drought in altering carbon lateral export by decreasing concentrations and fluxes and modifying export patterns. |
| format | Article |
| id | doaj-art-431c83ef6a044cbb877b09b5149afcdb |
| institution | Kabale University |
| issn | 0043-1397 1944-7973 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Water Resources Research |
| spelling | doaj-art-431c83ef6a044cbb877b09b5149afcdb2025-08-20T03:30:57ZengWileyWater Resources Research0043-13971944-79732025-03-01613n/an/a10.1029/2024WR038221Hydrologic Regime Determines Catchment‐Scale Dissolved Carbon Export PatternsXiao Li0Jian Wang1Wei Yin2Jianfeng Xu3Haibing Xiao4Hongying Zhao5Yongyong Shi6Lei Wang7Rui Hao8Haiyan Li9Yiming Huang10Hai Jiang11Zhihua Shi12State Environmental Protection Key Laboratory of Soil Health and Green Remediation Huazhong Agricultural University Wuhan ChinaState Environmental Protection Key Laboratory of Soil Health and Green Remediation Huazhong Agricultural University Wuhan ChinaChangjiang Water Resources Protection Institute Wuhan ChinaChangjiang Water Resources Protection Institute Wuhan ChinaState Environmental Protection Key Laboratory of Soil Health and Green Remediation Huazhong Agricultural University Wuhan ChinaState Environmental Protection Key Laboratory of Soil Health and Green Remediation Huazhong Agricultural University Wuhan ChinaState Environmental Protection Key Laboratory of Soil Health and Green Remediation Huazhong Agricultural University Wuhan ChinaState Environmental Protection Key Laboratory of Soil Health and Green Remediation Huazhong Agricultural University Wuhan ChinaState Environmental Protection Key Laboratory of Soil Health and Green Remediation Huazhong Agricultural University Wuhan ChinaSoil and Water Conservation Monitoring Centre Danjiangkou ChinaState Environmental Protection Key Laboratory of Soil Health and Green Remediation Huazhong Agricultural University Wuhan ChinaSoil and Water Conservation Monitoring Centre Danjiangkou ChinaState Environmental Protection Key Laboratory of Soil Health and Green Remediation Huazhong Agricultural University Wuhan ChinaAbstract Hydrologic regimes are affecting terrestrial carbon transformation, chemical weathering and lateral transport. However, its impacts on dissolved carbon export patterns remains elusive. In this study, we collected a 2‐year high‐frequency dissolved inorganic (DIC) and organic carbon (DOC) dataset, namely a wet year (Rainfall = 1,158 mm) and a dry year (Rainfall = 603 mm). The results showed that drought led to a significant decrease in dissolved carbon concentration and discharge during the monitoring period. During non‐storm periods, DIC and DOC shifted from dilution and chemostatic to enrichment patterns from wet to dry years, respectively. However, the export patterns were reversed during storm periods. DIC and DOC export patterns in wet year were dominated by dilution and chemostatic, respectively, while both patterns were dominated by dilution in dry year. Structural equation models revealed that the aridity index and temperature may affect dissolved carbon export patterns. We further classified storm events into three major types and conceptualized catchment‐scale transport mechanisms for dissolved carbon. Dry‐AMCs events result in DIC dilution and DOC chemostatic behavior, whereas Wet‐AMCs events result in DIC chemostatic and DOC enrichment behavior due to increased hydrological connectivity. The third type corresponds to extreme events, where larger overland flow often results in DIC dilution but DOC enrichment behavior. These findings reveal the predominant role of drought in altering carbon lateral export by decreasing concentrations and fluxes and modifying export patterns.https://doi.org/10.1029/2024WR038221dissolved carbonhydrologic regimeexport patternsstorm eventdroughtclimate change |
| spellingShingle | Xiao Li Jian Wang Wei Yin Jianfeng Xu Haibing Xiao Hongying Zhao Yongyong Shi Lei Wang Rui Hao Haiyan Li Yiming Huang Hai Jiang Zhihua Shi Hydrologic Regime Determines Catchment‐Scale Dissolved Carbon Export Patterns Water Resources Research dissolved carbon hydrologic regime export patterns storm event drought climate change |
| title | Hydrologic Regime Determines Catchment‐Scale Dissolved Carbon Export Patterns |
| title_full | Hydrologic Regime Determines Catchment‐Scale Dissolved Carbon Export Patterns |
| title_fullStr | Hydrologic Regime Determines Catchment‐Scale Dissolved Carbon Export Patterns |
| title_full_unstemmed | Hydrologic Regime Determines Catchment‐Scale Dissolved Carbon Export Patterns |
| title_short | Hydrologic Regime Determines Catchment‐Scale Dissolved Carbon Export Patterns |
| title_sort | hydrologic regime determines catchment scale dissolved carbon export patterns |
| topic | dissolved carbon hydrologic regime export patterns storm event drought climate change |
| url | https://doi.org/10.1029/2024WR038221 |
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