Export of DOC from forested catchments on the Precambrian Shield of Central Ontario: Clues from13C and 14C
作者： S.L. Schiff , R. Aravena , S.E. Trumbore , M.J. Hinton , R. Elgood
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摘要: Export of dissolved organic carbon (DOC) from forested catchmentsis governed by competing processes production, decomposition, sorptionand flushing. To examine the sources DOC, isotopes (14Cand 13C) were analyzed in DOC surface waters, groundwatersand soils a small catchment on Canadian Shield centralOntario. A significant fraction (greater than 50%) DOCin major inflows to lake is composed incorporated into organicmatter, solubilized and flushed stream within last 40 years. Incontrast, 14C groundwater was old indicating extensiverecycling forest floor derived soil column beforeelution lower B C horizons. uplandbasin had wide range values atbaseflow under dry basin conditions relatively modern during highflow or wetter antecedent conditions. Wetlands export mainly recently fixedcarbon with little seasonal range. streams entering lakemay be two pools; an older recalcitrant pool delivered bygroundwater young labile recent matter.The relative proportion these pools changes seasonally due thechanges water flowpaths dynamics. Althoughchanges local climate (temperature and/or precipitation) may alterthe proportions pools, islikely more refractory sedimentation decomposition thelake setting. Delivery andsusceptibility this photochemical mayconsequently important governing minimum concentrationlimit lakes.
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