Water geochemistry of the rivers around the Taklimakan Desert (NW China): Crustal weathering and evaporation processes in arid land

Zhang, Jingwei; Takahashi, Kazuya; Wushiki, Hisao; Yabuki, Sadayo; Xiong, Jian; Masuda, Akimasa

doi:10.1016/0009-2541(94)00088-p

Cited by 58 publications

(34 citation statements)

References 19 publications

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“…87 Sr/ 86 Sr, in loess and soils, range from 0.7118 to 0.7148 (average of 0.7136±0.0012), similar to previous studies. Zhang et al (1995) reported 87 Sr/ 86 Sr ratios of 0.7111-0.7154 from rivers around the Taklimakan Desert in northwest China, similar to those measured at both the Huanghe river (Yellow River;0.7111;Palmer and Edmond, 1989), and the Central Loess Plateau (0.7111; Yokoo et al 2004). …”

Section: Characterization Of Potential End-memberssupporting

confidence: 67%

Isotopes as tracers of sources of lead and strontium in aerosols (TSP & PM2.5) in Beijing

Wîdory¹,

Liu²,

Dong³

2010

Atmospheric Environment

105

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Even after its being phased out in gasoline in the late 90's, lead (Pb) is still present at relatively high levels in the atmosphere of Beijing, China (0.10-0.18 μg.m -3 ). Its origin is subject to debate as several distinct sources may contribute to the observed pollution levels. This study proposes to constrain the origin(s) of Pb and strontium (Sr) in aerosols, by coupling both Pb and Sr isotope systematics. The characterisation of the main pollution sources (road traffic, smelters, metal refining plants, coal combustion, cement factories, and soil erosion) shows that they can unambiguously be discriminated by the multi-isotope approach ( 206 Pb/ 204 Pb and 87 Sr/ 86 Sr). The study of total suspended particulates (TSP) and fine particles (PM 2.5 ) from Beijing and its vicinity indicates that both size fractions are controlled by the same sources. Lead isotopes indicate that metal refining plants are the major source of atmospheric lead, followed by thermal power stations and other coal combustion processes. The role of this latter source is confirmed by the study of strontium isotopes. Occasionally, emissions from cement plants and/or input from soil alteration are isotopically detectable.

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Section: Characterization Of Potential End-memberssupporting

confidence: 67%

Isotopes as tracers of sources of lead and strontium in aerosols (TSP & PM2.5) in Beijing

Wîdory¹,

Liu²,

Dong³

2010

Atmospheric Environment

105

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“…The upper stream is from Aral to Yingbazha (495 km), the middle reaches are from Yingbazha to Qiala (398 km) and the lower reach is from Qiala to Taitema Lake (428 km) (Figure 1). The Tarim River Basin is far from the sea and the presence of the Qinghai-Tibet Plateau is responsible for the arid climate and formation of the desert (Zhang et al, 1995). According to meteorological observation at Yuli and Luntai in the middle reaches, the precipitation is less than 80 mm/year and potential evaporation is from 1800 to 2900 mm/year, while annual average ambient temperature is 10Ð5°.…”

Section: Regional Hydrology and Hydrogeologymentioning

confidence: 99%

Diminished groundwater recharge and circulation relative to degrading riparian vegetation in the middle Tarim River, Xinjiang Uygur, Western China

Pang

Huang

Chen

2009

Hydrological Processes

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Abstract:Riparian vegetation in the middle Tarim River is being degenerated, and groundwater in the riparian system is a key factor controlling this process. Vegetation degeneration is related to the reduced inflow from the upstream, reduced recharge to riparian groundwater, lowered water table and increased salinity of the groundwater system. Systematic chemical and isotopic sampling of river water and groundwater transects perpendicular to the river show that riparian groundwater is fed by the river. River water picks up salts from the river bed and/or from irrigation returns as it flows downstream, and groundwater from riverbank sediments mirror this pattern. Mineral dissolution and evapotranspiration are the main mechanisms of salt accumulation in groundwater. Reduced recharge from the river has resulted in a distinctive zoning pattern in groundwater salinity. Groundwater residence times derived from tritium contents indicate that the extent of modern recharge (since the 1960s) is limited to approximately 1500 m from the riverbank in the middle reaches of the Tarim River. Vegetation grows better in habitats with modern groundwater than in other areas. The embankment built in 2001 along one side of the Tarim River appears to have reduced groundwater recharge, causing the water table to drop and ecosystem to degenerate.

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“…The minerals contained in the granites and metamorphic rocks are difficult to be dissolved in the alpine areas and the soluble rocks are mainly carbonate [45] in the TRB. The dissolution begins with eroding host rocks with CO 2 from soil zone and generally forms low mineralization type water of HCO 3 -Ca in mountainous area with TDS commonly less than 0.5 g/L [34,46]. However, due to wide distribution of soluble mineral, salt drainage and evapotranspiration, the salinity of river and groundwater increases at the middle and lower reaches [47].…”

Section: Water Qualitymentioning

confidence: 99%

Groundwater circulation relative to water quality and vegetation in an arid transitional zone linking oasis, desert and river

et al. 2013

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In groundwater-dependent ecosystems, groundwater circulation controls the overall water quality and ecosystem dynamics. Groundwater and vegetation across a 30-km groundwater transect linking oasis, desert and river in an extremely arid area were investigated with a series of soil profiles drilled into the unsaturated zone to understand groundwater circulation and its control on groundwater quality and surface vegetation in the extremely arid Lower Tarim River, NW China. Measurements have included water-table depth, water chemistry and water isotopes ( 2 H, 18 O, 3 H) for 15 water samples, soil moisture and chloride content for 11 soil profiles, and vegetation investigation. Results show that the groundwater in desert zone is characterized by slow recharge rate (pre-modern water), great water-table depth (6.17-9.43 m) and high salinity (15.32-26.50 g/L), while that in oasis (uncultivated land) and riparian zone is characterized by relatively fast recharge rate (modern water), small groundwater-table depth (3.56-8.36 m) and low salinity (1.25-1.95 g/L). Stable isotopes show that secondary evaporation takes place during irrigation in oasis. The vegetation characteristics (coverage, richness, evenness and number of plants) are closely related to soil moisture and water-table depth. Groundwater recharge from irrigation in oasis and from river in riparian zone sustains a better ecosystem than that in the desert area, where lateral and vertical groundwater recharge is limited. The more evapotranspirative enrichment may occur in the vegetated and water-rich riparian zone as compared to desert. This study also demonstrates the effectiveness of environmental tracers in studying ecohydrological processes in arid regions.isotope, soil profile, riparian zone, ecosystem, salinity, arid zone hydrology Citation:Huang T M, Pang Z H, Chen Y N, et al. Groundwater circulation relative to water quality and vegetation in an arid transitional zone linking oasis, desert and river.

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Water geochemistry of the rivers around the Taklimakan Desert (NW China): Crustal weathering and evaporation processes in arid land

Cited by 58 publications

References 19 publications

Isotopes as tracers of sources of lead and strontium in aerosols (TSP & PM2.5) in Beijing

Isotopes as tracers of sources of lead and strontium in aerosols (TSP & PM2.5) in Beijing

Diminished groundwater recharge and circulation relative to degrading riparian vegetation in the middle Tarim River, Xinjiang Uygur, Western China

Groundwater circulation relative to water quality and vegetation in an arid transitional zone linking oasis, desert and river

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