#8161. Dynamic 2H irrigation pulse labelling reveals rapid infiltration and mixing of precipitation in the soil and species-specific water uptake depths of trees in a temperate forest

October 2026publication date
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Journal’s subject area:
Aquatic Science;
Ecology, Evolution, Behavior and Systematics;
Ecology;
Earth-Surface Processes;
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Abstract:
Understanding the movement of water in terrestrial ecosystems and determining the soil depths from which mature trees take up water has become an important research priority. Here, we test the suitability of a dynamic 2H pulse-labelling experiment for assessing (1) the fate of a simulated precipitation event as it moves through the ecohydrological system and (2) the water uptake depths of different tree species in a mature temperate forest. We applied 2H-labelled water as a single pulse to the top soil using a sprinkler system and then allowed it to infiltrate into deeper soil layers by washing it through the soil column with a sequence of non-2H-labelled irrigation pulses. We then followed this 2H-enriched irrigation pulse over a period of 81 days in different depths of the soil and in the xylem of four tree species (Fagus sylvatica, Quercus petraea, Picea abies and Pinus sylvestris).
Keywords:
deuterium isotopes; labelling; plant–water relations; preferential flow; rooting depth; soil; trees; two water worlds

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