Fig. 4 Regional
atmospheric waterline in Wuhan (data from IAEA (1986–1998) and (Denget al. , 2016) (2011–2013)).
3.3 δ18O
and δ2H isotope composition of soil water at the test
site
Table 2 lists the general characteristics of the isotope composition of
soil water. As can be observed,
δ18O in soil
water varies from −9.53‰ to −3.47‰, and δ2H ranges
from −59.34‰ to −31.83‰ over a depth range of 0–30 cm from the surface
during the test. The average values of δ18O and
δ2H decreased gradually with depth, which indicates
that the isotope fractionation caused by evaporation was more
significant in the surface layer of the soil than that in the deeper
layers.