Technical note: Evaporating water is different from bulk soil water in <i>?</i><sup>2</sup>H and <i>?</i><sup>18</sup>O and has implications for evaporation calculation
نویسندگان
چکیده
Abstract. Soil evaporation is a key process in the water cycle and can be conveniently quantified using ?2H ?18O bulk surface soil (BW). However, recent research shows that larger pores evaporates first differs from smaller ?18O, which disqualifies quantification of BW ?18O. We hypothesized had different isotopic compositions evaporating (EW). Therefore, our objectives were to test this hypothesis then evaluate whether difference alters calculated evaporative loss. measured composition during two continuous periods summer maize field. Period I duration 32 d, following natural precipitation event, period II lasted 24 an irrigation event with 2H-enriched water. was obtained by cryogenically extracting samples 0–5 cm taken every 3 d; EW derived condensation collected 2 d on plastic film placed surface. The results showed when heavier than pre-event BW, decreased, increase time, indicating heavy evaporation. When lighter increased increasing suggesting light Moreover, relative significantly (p<0.05). These observations suggest close water, both differed Furthermore, might takes precedence. losses isotopes compared those BW. With small between did not differ (p>0.05). Our have important implications for quantifying processes stable isotopes. Future studies are needed investigate how partition differently soils pore size distributions affect estimation.
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ژورنال
عنوان ژورنال: Hydrology and Earth System Sciences
سال: 2021
ISSN: ['1607-7938', '1027-5606']
DOI: https://doi.org/10.5194/hess-25-5399-2021