δ13C of organic matter transported from the leaves to the roots in Eucalyptus delegatensis: short-term variations and relation to respired CO2
作者： Arthur Gessler , Claudia Keitel , Naomi Kodama , Christopher Weston , Anthony J. Winters
DOI: 10.1071/FP07064
关键词: Organic matter 、 Carbon fixation 、 Botany 、 Biology 、 Phloem 、 Phloem transport 、 Isotopes of carbon 、 Eucalyptus delegatensis 、 Carbon dioxide 、 Stable isotope ratio
摘要: Post-photosynthetic carbon isotope fractionation might alter the isotopic signal imprinted on organic matter (OM) during primary fixation by Rubisco. To characterise influence of post-photosynthetic processes, we investigated effect starch storage and remobilisation stable signature (δ13C) different pools in Eucalyptus delegatensis R. T. Baker leaf potential associated with phloem transport respiration. Twig exudate water-soluble OM showed diel variations δ13C up to 2.5 2‰, respectively, 13C enrichment night depletion day. Damped variation was also evident bulk lipids wax fraction. nocturnal corresponded released from starch. There no change along trunk. CO2 emitted trunks roots enriched compared substrate, depleted soil-emitted CO2. The results are consistent transitory accumulation governing rhythm phloem-transported fragmentation occurring When using or for assessing ecosystem processes plant reactions towards environmental constraints, discrimination should be considered.
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