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• W2096791042 abstract "Abstract Much of our understanding about how carbon (C) is allocated in plants comes from radiocarbon ( 14 C) pulse‐chase labeling experiments. However, the large amounts of 14 C required for decay‐counting mean that these studies have been restricted for the most part to mesocosm or controlled laboratory experiments. Using the enhanced sensitivity for 14 C detection available with accelerator mass spectrometry (AMS), we tested the utility of a low‐level 14 C pulse‐chase labeling technique for quantifying C allocation patterns and the contributions of different plant components to total ecosystem respiration in a black spruce forest stand in central Manitoba, Canada. All aspects of the field experiment used 14 C at levels well below regulated health standards, without significantly altering atmospheric CO 2 concentrations. Over 30 days following the label application in late summer (August and September), we monitored the temporal and spatial allocation patterns of labeled photosynthetic products by measuring the amount and 14 C content of CO 2 respired from different ecosystem components. The mean residence times (MRT) for labeled photosynthetic products to be respired in the understory (feather mosses), canopy (black spruce), and rhizosphere (black spruce roots and associated microbes) were <1, 6, and 15 days, respectively. Respiration from the canopy and understory showed significantly greater influence of labeled photosynthates than excised root and intact rhizosphere respiration. After 30 days,∼65% of the label assimilated had been respired by the canopy,∼20% by the rhizosphere, and∼9% by the understory, with∼6% unaccounted for and perhaps remaining in tissues. Maximum 14 C values in root and rhizosphere respiration were reached 4 days after label application. The label was still detectable in root, rhizosphere and canopy respiration after 30 days; these levels of remaining label would not have been detectible had a 13 C label been applied. Our results support previous studies indicating that a substantial portion of the C fueling rhizosphere respiration in the growing season may be derived from stored C pools rather than recent photosynthetic products." @default.
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• W2096791042 date "2006-11-29" @default.
• W2096791042 modified "2023-10-15" @default.
• W2096791042 title "Allocation and residence time of photosynthetic products in a boreal forest using a low-level¹⁴C pulse-chase labeling technique" @default.
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• W2096791042 doi "https://doi.org/10.1111/j.1365-2486.2006.01300.x" @default.
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