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Total organic carbon concentrations in ecosystem solutions of a remote tropical montane forest respond to global environmental change [in press]

Wilcke, Wolfgang; Velescu, Andre; Leimer, Sophia; Blotevogel, Simon; Alvarez, Pablo; Valarezo, Carlos

Abstract:
The response of organic carbon (C) concentrations in ecosystem solutions to environmental change affects the release of dissolved organic matter (DOM) from forests to surface and groundwaters. We determined the total organic C (TOC) concentrations (filtered <1–7 µm) and the ratios of TOC/dissolved organic nitrogen (DON) concentrations, electrical conductivity (EC), and pH in all major ecosystem solutions of a tropical montane forest from 1998 to 2013. The forest was located on the rim of the Amazon basin in Ecuador and experienced increasing numbers of days with >25°C, decreasing soil moisture, and rising nitrogen (N) deposition from the atmosphere during the study period. In rainfall, throughfall, mineral soil solutions (at the 0.15‐ and 0.30‐m depths), and streamflow, TOC concentrations and fluxes decreased significantly from 1998 to 2013, while they increased in stemflow. TOC/DON ratios decreased significantly in rainfall, throughfall, soil solution at the 0.15‐m depth, and streamflow. Based on Δ14C values, the TOC in rainfall and mineral soil solutions was 1 year old and that of litter leachate was 10 years old. The pH in litter leachate decreased with time, that in mineral soil solutions increased, while those in the other ecosystem solutions did not change. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000125909
Veröffentlicht am 10.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Geographie und Geoökologie (IFGG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1354-1013, 1365-2486
KITopen-ID: 1000125909
Erschienen in Global change biology
Seiten gcb.15351
Vorab online veröffentlicht am 04.10.2020
Nachgewiesen in Scopus
Web of Science
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