INVESTIGADORES
GARCIA DE SOUZA Javier Ricardo
artículos
Título:
How autochthonous dissolved organic matter responds to eutrophication and climate warming: Evidence from a cross-continental data analysis and experiments
Autor/es:
ZHOU, YONGQIANG; DAVIDSON, THOMAS A.; YAO, XIAOLONG; ZHANG, YUNLIN; JEPPESEN, ERIK; GARCIA DE SOUZA JAVIER RICARDO; WU, HUAWU; SHI, KUN; QIN, BOQIANG
Revista:
EARTH-SCIENCE REVIEWS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2018 vol. 185 p. 928 - 937
ISSN:
0012-8252
Resumen:
Harmful algal blooms have become increasingly frequent due to the dual pressure of excessive nutrient loadingand climate change in recent years. Algal-derived dissolved organic matter (DOM) is a potentially large componentof the labile organic matter pool, and also climate warming may affect the DOM pool, although theresults on the latter so far are equivocal. The question of how eutrophication and climate warming may drive theaccumulation of autochthonous DOM is much debated. Here, we analysed published data on DOM world-wideand field data that we collected from 97 lakes and major rivers in China (> 4500 samples) as well as results fromthe longest running shallow-lake mesocosm climate experiment in the world at a research facility in Denmark.Our results indicated that dissolved organic carbon (DOC) concentrations decreased with increasing temperatureand enrichment of δ13C-DOM. A negative relationship was found between latitude and %protein-like fluorescence,which increased significantly with increasing elevation and enrichment of δ13C-DOM. Specific ultravioletabsorbance at 254 nm (SUVA) decreased with increasing elevation and enrichment of δ13C-DOM. Fluorescenceintensity of autochthonous microbial humic-like substances increased notably with eutrophication but decreasedweakly with warming. DOC, biodegradable DOC, chlorophyll-a, δ13C-DOC and autochthonous substancesidentified using DOM fluorescence and high resolution mass spectrometry from the mesocosm experiment werenotably elevated at the high nutrient levels, while the effect of temperature was insignificant. We conclude thatwhile eutrophication promotes DOM, warming potentially suppresses the accumulation of autochthonous DOMin inland waters.