Variability of δ2H and δ18O in Soil Water and Its Linkage to Precipitation in an East Asian Monsoon Subtropical Forest Plantation
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Academic Editors: Polona Vreča and Zoltán Kern
Water 2021, 13(20), 2930; https://doi.org/10.3390/w13202930
Received: 2 September 2021
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Revised: 14 October 2021
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Accepted: 15 October 2021
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Published: 19 October 2021
(This article belongs to the Special Issue Use of Water Isotopes in Hydrological Processes II)
The linkage between δ2H and δ18O of soil water and precipitation provides a way of understanding precipitation infiltration, residence time, and soil water source. Soil water at 0–5, 15–20, and 40–45 cm depths and event-based precipitation were collected in a subtropical forest plantation. Correlations between the δ18O of soil water and precipitation on the same day were used to determine the critical threshold of precipitation infiltration. Residence time of precipitation in soil was determined with correlations between the δ18O of soil water and cumulative precipitation before sampling. Soil water source was determined by the intersection points of Soil Water Evaporation Lines (SEL) and local meteoric water lines. The results showed that precipitation >5–6 mm could pass through canopy and litter, and infiltrate into soil. Residence times varied from a few days to several months, and increased with soil depth. The model-based approach for SEL estimation were more robust than the regression-based approach due to the inverse variability in the δ2H and δ18O of soil water source and soil evaporative fractionation. Soil water at a 0–5 cm depth originated mainly from precipitation in the current season, while those at 15–20 and 40–45 cm depths originated mainly from precipitation in the previous season.
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Keywords:
stable isotopes; soil water; precipitation infiltration; residence time; soil water source; seasonal variation; East Asian monsoon region
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MDPI and ACS Style
Lyu, S. Variability of δ2H and δ18O in Soil Water and Its Linkage to Precipitation in an East Asian Monsoon Subtropical Forest Plantation. Water 2021, 13, 2930. https://doi.org/10.3390/w13202930
AMA Style
Lyu S. Variability of δ2H and δ18O in Soil Water and Its Linkage to Precipitation in an East Asian Monsoon Subtropical Forest Plantation. Water. 2021; 13(20):2930. https://doi.org/10.3390/w13202930
Chicago/Turabian StyleLyu, Sidan. 2021. "Variability of δ2H and δ18O in Soil Water and Its Linkage to Precipitation in an East Asian Monsoon Subtropical Forest Plantation" Water 13, no. 20: 2930. https://doi.org/10.3390/w13202930
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