James D. Kelley, Sandra Klemet-N'Guessan, Nolan J. T. Pearce, Claire M. Stevens, Anthony J. Arsenault, Miracle Denga, P. V. Sasindu L. Gunawardana, Sarah S. E. King, Carolina N. Koebel, Sherryann A. Prowell, Most Shirina Begum, Marguerite A. Xenopoulos
{"title":"气候变化和城市化对河流溶解有机碳数量和组成的解耦作用","authors":"James D. Kelley, Sandra Klemet-N'Guessan, Nolan J. T. Pearce, Claire M. Stevens, Anthony J. Arsenault, Miracle Denga, P. V. Sasindu L. Gunawardana, Sarah S. E. King, Carolina N. Koebel, Sherryann A. Prowell, Most Shirina Begum, Marguerite A. Xenopoulos","doi":"10.1029/2025GB008534","DOIUrl":null,"url":null,"abstract":"<p>Dissolved organic carbon (DOC) is a ubiquitous component of freshwater ecosystems that is sensitive to global change. In turn, DOC controls fundamental biogeochemical processes and functions. These controls depend on both the amount and composition of organic molecules comprising the dissolved organic matter (DOM) pool, which reflects the relative contributions of catchment-derived terrestrial inputs and in situ production. Stream DOM fluctuates with land use, soil mobility, and hydrology; however, few studies have monitored long-term changes in DOM composition to investigate links with climate. Here, we characterized 17-year trends in DOC and DOM in 48 streams across a land use gradient and modeled patterns therein with climatic and hydrological conditions. Across streams, Mann-Kendall trend analyses showed that DOC decreased through time, while DOM became fresher, more aromatic, and contained an increased proportion of urban-derived DOM from the terrestrial catchment. Using generalized additive models, we observed significant linear, unimodal, and multimodal patterns in DOM composition with precipitation and soil temperature. Generally, precipitation increased terrestrial DOM, whereas soil temperature increased urban-derived DOM, particularly in catchments characterized by increasing levels of urbanization. Our study highlights the importance of long-term monitoring in understanding dynamic interactions between terrestrial—fluvial carbon transfer and biogeochemical effects of global climate change and urbanization. Altogether, our results show that interactions between climate change and urbanization will shape future DOM dynamics in streams.</p>","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"39 8","pages":""},"PeriodicalIF":5.5000,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GB008534","citationCount":"0","resultStr":"{\"title\":\"Climate Change and Urbanization Decouple Dissolved Organic Carbon Quantity and Composition in Streams\",\"authors\":\"James D. Kelley, Sandra Klemet-N'Guessan, Nolan J. T. Pearce, Claire M. Stevens, Anthony J. Arsenault, Miracle Denga, P. V. Sasindu L. Gunawardana, Sarah S. E. King, Carolina N. Koebel, Sherryann A. Prowell, Most Shirina Begum, Marguerite A. Xenopoulos\",\"doi\":\"10.1029/2025GB008534\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Dissolved organic carbon (DOC) is a ubiquitous component of freshwater ecosystems that is sensitive to global change. In turn, DOC controls fundamental biogeochemical processes and functions. These controls depend on both the amount and composition of organic molecules comprising the dissolved organic matter (DOM) pool, which reflects the relative contributions of catchment-derived terrestrial inputs and in situ production. Stream DOM fluctuates with land use, soil mobility, and hydrology; however, few studies have monitored long-term changes in DOM composition to investigate links with climate. Here, we characterized 17-year trends in DOC and DOM in 48 streams across a land use gradient and modeled patterns therein with climatic and hydrological conditions. Across streams, Mann-Kendall trend analyses showed that DOC decreased through time, while DOM became fresher, more aromatic, and contained an increased proportion of urban-derived DOM from the terrestrial catchment. Using generalized additive models, we observed significant linear, unimodal, and multimodal patterns in DOM composition with precipitation and soil temperature. Generally, precipitation increased terrestrial DOM, whereas soil temperature increased urban-derived DOM, particularly in catchments characterized by increasing levels of urbanization. Our study highlights the importance of long-term monitoring in understanding dynamic interactions between terrestrial—fluvial carbon transfer and biogeochemical effects of global climate change and urbanization. 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Climate Change and Urbanization Decouple Dissolved Organic Carbon Quantity and Composition in Streams
Dissolved organic carbon (DOC) is a ubiquitous component of freshwater ecosystems that is sensitive to global change. In turn, DOC controls fundamental biogeochemical processes and functions. These controls depend on both the amount and composition of organic molecules comprising the dissolved organic matter (DOM) pool, which reflects the relative contributions of catchment-derived terrestrial inputs and in situ production. Stream DOM fluctuates with land use, soil mobility, and hydrology; however, few studies have monitored long-term changes in DOM composition to investigate links with climate. Here, we characterized 17-year trends in DOC and DOM in 48 streams across a land use gradient and modeled patterns therein with climatic and hydrological conditions. Across streams, Mann-Kendall trend analyses showed that DOC decreased through time, while DOM became fresher, more aromatic, and contained an increased proportion of urban-derived DOM from the terrestrial catchment. Using generalized additive models, we observed significant linear, unimodal, and multimodal patterns in DOM composition with precipitation and soil temperature. Generally, precipitation increased terrestrial DOM, whereas soil temperature increased urban-derived DOM, particularly in catchments characterized by increasing levels of urbanization. Our study highlights the importance of long-term monitoring in understanding dynamic interactions between terrestrial—fluvial carbon transfer and biogeochemical effects of global climate change and urbanization. Altogether, our results show that interactions between climate change and urbanization will shape future DOM dynamics in streams.
期刊介绍:
Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.