soil water migration in the unsaturated zone of semiarid region in china from isotope evidence
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ID: 173446
2017
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Abstract
Soil water is an important driving force of the
ecosystems, especially in the semiarid hill and gully region of the
northwestern Loess Plateau in China. The mechanism of soil water migration
in the reconstruction and restoration of Loess Plateau is a key scientific
problem that must be solved. Isotopic tracers can provide valuable
information associated with complex hydrological problems,
difficult to obtain using other methods. In this study, the oxygen and hydrogen
isotopes are used as tracers to investigate the migration processes of soil
water in the unsaturated zone in an arid region of China's Loess Plateau.
Samples of precipitation, soil water, plant xylems and plant roots are
collected and analysed. The conservative elements deuterium (D) and
oxygen (18O) are used as tracers to identify variable source and
mixing processes. The mixing model is used to quantify the contribution of
each end member and calculate mixing amounts. The results show that the
isotopic composition of precipitation in the Anjiagou River basin is
affected by isotopic fractionation due to evaporation. The isotopic
compositions of soil waters are plotted between or near the local meteoric
water lines, indicating that soil waters are recharged by precipitation. The
soil water migration is dominated by piston-type flow in the study area and
rarely preferential flow. Water migration exhibited a transformation pathway
from precipitation to soil water to plant water. δ18O and
δD are enriched in the shallow (< 20 cm depth) soil water
in most soil profiles due to evaporation. The isotopic composition of xylem
water is close to that of soil water at the depth of 40–60 cm. These values reflect soil water signatures associated with
Caragana korshinskii Kom. uptake at the depth of 40–60 cm. Soil water from the surface soil layer (20–40 cm) comprised 6–12 % of plant xylem water, while soil water at the depth of 40–60 cm is the largest component of plant xylem water (ranging from 60 to 66 %), soil water
below 60 cm depth comprised 8–14 % of plant xylem water and only
5–8 % is derived directly from precipitation. This study investigates
the migration process of soil water, identifies the source of plant
water and finally provides a scientific basis for identification of model
structures and parameters. It can provide a scientific basis for ecological
water demand, ecological restoration, and management of water resources.
| Reference Key |
yang2017hydrologysoil
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|---|---|
| Authors | ;Y. Yang;B. Fu |
| Journal | materials research bulletin |
| Year | 2017 |
| DOI |
10.5194/hess-21-1757-2017
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| URL | |
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