Dynamics of initial carbon allocation after drought release in mature Norway spruce-Increased belowground allocation of current photoassimilates covers only half of the carbon used for fine-root growth
GLOBAL CHANGE BIOLOGY. HOBOKEN: WILEY HOBOKEN
ISBN/ISSN: 1354-1013
Publikationstyp: Zeitschriftenaufsatz
Sprache: Englisch
Doi/URN: 10.1111/gcb.16388
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Inhaltszusammenfassung
After drought events, tree recovery depends on sufficient carbon (C) allocation to the sink organs. The present study aimed to elucidate dynamics of tree-level C sink activity and allocation of recent photoassimilates (C-new) and stored C in c. 70-year-old Norway spruce (Picea abies) trees during a 4-week period after drought release. We conducted a continuous, whole-tree C-13 labeling in parallel with controlled watering after 5 years of experimental summer drought. The fate of C-new to grow...After drought events, tree recovery depends on sufficient carbon (C) allocation to the sink organs. The present study aimed to elucidate dynamics of tree-level C sink activity and allocation of recent photoassimilates (C-new) and stored C in c. 70-year-old Norway spruce (Picea abies) trees during a 4-week period after drought release. We conducted a continuous, whole-tree C-13 labeling in parallel with controlled watering after 5 years of experimental summer drought. The fate of C-new to growth and CO2 efflux was tracked along branches, stems, coarse- and fine roots, ectomycorrhizae and root exudates to soil CO2 efflux after drought release. Compared with control trees, drought recovering trees showed an overall 6% lower C sink activity and 19% less allocation of C-new to aboveground sinks, indicating a low priority for aboveground sinks during recovery. In contrast, fine-root growth in recovering trees was seven times greater than that of controls. However, only half of the C used for new fine-root growth was comprised of C-new while the other half was supplied by stored C. For drought recovery of mature spruce trees, in addition to C-new, stored C appears to be critical for the regeneration of the fine-root system and the associated water uptake capacity. » weiterlesen» einklappen
