Study on the Variation of Hydrogen and Oxygen Isotopes in Soil Water

2008 ◽  
Author(s):  
Haiying Hu ◽  
Weimin Bao ◽  
Tao Wang ◽  
Simin Qu
Keyword(s):  
Soil Water ◽  
Oxygen Isotopes ◽  
Hydrogen And Oxygen Isotopes

scholarly journals Using Stable Hydrogen and Oxygen Isotopes to Distinguish the Sources of Plant Leaf Surface Moisture in an Urban Environment

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2287
Author(s):  
Xu ◽  
Yi ◽  
Yang ◽  
Dou
Keyword(s):  
Soil Water ◽  
Oxygen Isotopes ◽  
Leaf Surface ◽  
Mass Conservation ◽  
Urban Systems ◽  
Plant Leaf ◽  
Surface Moisture ◽  
Hydrogen And Oxygen Isotopes ◽  
Characteristic Values ◽  
Frost Free Period

Plant leaf surface moisture is a frequent meteorological phenomenon that has complicated sources. As such, the determination of whether surface moisture is the input water or only the redistribution of water in the soil–plant–atmosphere ecosystem is of great importance. In this study, δ18O and δD characteristic values of dew, guttation, and soil waters in Buxus sinica var. parvifolia M. Cheng were monitored during the frost-free period (June–September 2017) in Changchun, China, to differentiate the hydraulic relationship among atmospheric vapor, rainwater, soil, dew, and guttation waters and quantitatively distinguish the leaf surface moisture on the canopy and bottom of plants. The water vapor sources of the leaf surface moisture on plants’ canopy and bottom were quantitatively verified in accordance with isotope fractionation and mass conservation principles. Results demonstrated that leaf surface moisture, atmospheric vapor, soil water, and dew were closely related. Leaf surface moisture was mainly the condensation of dew. The sources of canopy and bottom leaf surface moisture were basically the same. The proportions of canopy moisture from plant guttation, atmospheric vapor, and soil water were 2.4%–2.5%, 79.8%–92.4%, and 5.1%–17.8%, respectively. By comparison, the proportions of bottom leaf surface moisture were 0.6%–1.4%, 80.0%–93.0%, and 6.4%–18.6%, respectively. Leaf surface moisture is an important water input in urban systems. Moreover, the characteristic values of stable hydrogen and oxygen isotopes of urban dew are supplemented, and the transformation of atmospheric vapor, rainwater, and soil and dew waters is revealed.

Application of tracer materials in the study of hydrological cycle mechanism

2020 ◽  
Author(s):  
Tao Ma ◽  
Hongwei Liu ◽  
Hao Zheng ◽  
Xing Min ◽  
Aimin Liao ◽  
...  
Keyword(s):  
Soil Water ◽  
Oxygen Isotopes ◽  
Hydrological Cycle ◽  
Sample Pretreatment ◽  
Underground Water ◽  
Transport Processes ◽  
Coupling Mechanism ◽  
Contour Maps ◽  
Hydrogen And Oxygen Isotopes ◽  
Errors Analysis

<p>In this study, the characteristics of hydrogen and oxygen isotopes as well as four kind of ions(K<sup>+</sup>、Na<sup>+</sup>、Ca<sup>2+</sup>、Mg<sup>2+ </sup>)in rainfall-runoff processes are analyzed through designing an extensible soil water sampler. It is a kind of multipoint sampling installation with the characteristics of synchronous, in-situ and long-term in sampling. The sampling schemes were summarized, including site layout ways, capacities and materials selection, sample pretreatment and storage methods, and valid date. A series of experiments were carried out such as hydrogen and oxygen isotopes memory effects tests, repeatability test and dilution errors analysis. After recognizing the possible error sources in hydrogen and oxygen isotopes as well as the four kind of ions test, the solution on how to improve accuracy and precision were proposed. Moreover, the spatial-temporal evolution laws of the isotopes and cations was discussed by drawing the contour maps of hydrogen and oxygen isotopes as well as the four kind of ions in soil water and underground water. At last, the possibility and applicability of these substances as tracers in hydrological cycles were explored. These work were quite important for researches on coupling mechanism of hydrological and solute transport processes in critical zone.</p>

scholarly journals Determining the Discharge and Recharge Relationships between Lake and Groundwater in Lake Hulun Using Hydrogen and Oxygen Isotopes and Chloride Ions

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 264 ◽  
Author(s):  
Zhiming Han ◽  
Xiaohong Shi ◽  
Keli Jia ◽  
Biao Sun ◽  
Shengnan Zhao ◽  
...  
Keyword(s):  
Oxygen Isotopes ◽  
Meteoric Water ◽  
Chloride Ions ◽  
Water Levels ◽  
Tracer Method ◽  
Aeration Zone ◽  
Fractionation Process ◽  
Hydrogen And Oxygen Isotopes ◽  
Freezing Period

This study examined the discharge and recharge relationships between lake and groundwater in Lake Hulun using a novel tracer method that tracks hydrogen and oxygen isotopes and chloride ions. The hydrogen and oxygen isotopes in precipitation falling in the Lake Hulun Basin were compared with those in water samples from the lake and from the local river, well and spring water during both freezing and non-freezing periods in 2017. The results showed that the local meteoric water line equation in the Lake Hulun area is δD = 6.68 δ18O − 5.89‰ (R2 = 0.96) and the main source of water supply in the study area is precipitation. Long-term groundwater monitoring data revealed that the groundwater is effectively recharged by precipitation through the aeration zone. Exchanges between the various compounds during the strong evaporative fractionation process in groundwater are responsible for the gradual depletion of δ18O. The lake is recharged by groundwater during the non-freezing period, as shown in the map constructed to show the recharge and discharge relationships between the lake and groundwater. The steadily rising lake water levels in the summer mean that the water level before the freeze is high and consequently the water in the lake drains into the surrounding groundwater via faults along both sides of the lake during the frozen period. The groundwater is discharged into the lake in the west and into the Urson River in the east due to the Cuogang uplift.

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