Abstract
The unsaturated zone is an important link between groundwater and the land surface, and can provide storage capacity for both water and contaminants. Consequently, the solute profile of the unsaturated zone can provide much information on groundwater recharge using tracers. This study takes a rain-fed agricultural area (Luochuan loess plain) in the Chinese Loess Plateau as an example to demonstrate how much recharge information in the thick unsaturated zone can be obtained from the solute profile. The results show that the recharge rate is 36–67 mm yr–1 and infiltration rate is 0.19 to 0.30 m yr–1, as obtained using three methods, i.e., evaluating the Cl-peak, chloride mass balance, and nitrate levels. The amount of time needed for annual precipitation to reach the water table is 133–316 years, and the groundwater is tritium free. The nitrate introduced by human activities is mainly distributed in the upper unsaturated zone (above 6 m), and the groundwater nitrate content (3.7 to 9.6 mg l–1 as NO3) remains at baseline level. The storage capacity of the unsaturated zone is found to delay the entrance of pollutants into the aquifer.
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Allison, G.B. and Hughes, M.W., 1978, The use of environmental chloride and tritium to estimate total recharge to an unconfined aquifer. Australian Journal of Soil Research, 16, 181–195.
Allison, G.B., Gee, G.W., and Tyler, S.W., 1994, Vadose-zone techniques for estimating groundwater recharge in arid and semiarid regions. Soil Science Society of America Journal, 58, 6–14.
Bohlke, J.K., 2002, Groundwater recharge and agricultural contamination. Hydrogeology Journal, 10, 153–179.
EANET–Acid Deposition Monitoring Network in East Asia, 2009}, EANET data on the acid deposition in the East Asian region. http://www.eanet.cc. Cited 25 December 2009
Edmunds, W.M. and Gaye, C.B., 1997, Naturally high nitrate concentrations in groundwaters from the Sahel. Journal of Environmental Quality, 26, 1231–1239
Edmunds, W.M. and Shand, P., 2008, Groundwater baseline quality. In: Edmunds, W.M. and Shand, P. (eds.), Natural Groundwater Quality. Blackwell, Malden, p. 1–21.
Edmunds, W.M. and Tyler, S.W., 2002, Unsaturated zones as archives of past climates: Toward a new proxy for continental regions. Hydrogeology Journal, 10, 216–228.
Edmunds, W.M. and Walton, N.R.G., 1980, A geochemical and isotopic approach to recharge evaluation in semi arid zones–past and present. In: Fontes, J.C. (ed.), Arid-zone hydrology: investigations with isotope techniques. Proceeding of Advisory Group Meeting on Application of Isotope Techniques in Arid Zones Hydrology, IAEA, Vienna, Nov. 6–9, 1978, p. 47–68.
Edmunds, W.M., 2009, Geochemistry’s vital contribution to solving water resource problems. Applied Geochemistry, 24, 1058–1073.
Gates, J.B., Edmunds, W.M., Ma, J., and Scanlon, B.R., 2008, Estimating groundwater recharge in a cold desert environment in northern China using chloride. Hydrogeology Journal, 16, 893–910.
Gates, J.B., Scanlon, B.R., Mu, X., and Zhang, L., 2011, Impacts of soil conservation on groundwater recharge in the semi-arid Loess Plateau, China. Hydrogeology Journal, 19, 865–875.
Gee, G.W. and Hillel, D., 1988, Groundwater recharge in arid regions: Review and critique of estimation methods. Hydrological Processes, 2, 255–266.
Goni, I.B., Fellman, E., and Edmunds, W.M., 2001, Rainfall geochemistry in the Sahel region of northern Nigeria. Atmospheric Environment, 35, 4331–4339.
Huang, M. and Gallichand, J., 2006, Use of the SHAW model to assess soil water recovery after apple trees in the gully region of the Loess Plateau, China. Agricultural Water Management, 85, 67–76.
Huang, T., Liu, J., and Wang, G., 2012, Groundwater baseline quality in the Minqin Basin, NWChina. Advanced Materials Research, 518–523, 3643–3646.
Li, Y. and Huang, M., 2008, Pasture yield and soil water depletion of continuous growing alfalfa in the Loess Plateau of China. Agriculture, Ecosystems & Environment, 124, 24–32.
Li, Y., 1983, The properties of water cycle in soil and their effect on water cycle for land in the loess region. Acta Ecologica Sinica, 3, 91–101. (in Chinese with English abstract)
Lin, R. and Wei, K., 2001, Environmental isotope profiles of the soil water in loess unsaturated zone in semi-arid areas of China. In: Yurtsever, Y. (ed.), Isotope Based Assessment of Groundwater Renewal in Water Scarce Regions. Proceedings of a final research co-ordination meeting, IAEA, Vienna, Oct. 18–21, 1999, p. 101–118.
Lin, R. and Wei, K., 2006, Tritium profiles of pore water in the Chinese loess unsaturated zone: Implications for estimation of groundwater recharge. Journal of Hydrology, 328, 192–199.
Liu, T., 1985, Loess and the Environment. Science Press, Beijing, 481 p. (in Chinese)
Ma, J. and Edmunds, W.M., 2006, Groundwater and lake evolution in the Badain Jaran Desert ecosystem, Inner Mongolia. Hydrogeology Journal, 14, 1231–1243.
Ma, J., Ding, Z., Edmunds, W.M., Gates, J.B., and Huang, T., 2009, Limits to recharge of groundwater from Tibetan plateau to the Gobi desert, implications for water management in the mountain front. Journal of Hydrology, 364, 128–141.
Maan, J.F., 1976, Wasterwaters in the vadose zone of arid regions: hydrologic interactions. Ground Water, 14, 367–372.
Phillips, F.M., 1994, Environmental tracers for water movement in desert soils of the American southwest. Soil Science Society of America Journal, 58, 15–24.
Phillips, F.M., Mattick, J.L., and Duval, T.A., 1988, Chlorine 36 and tritium from nuclear weapons fallout as tracers for long-term liquid movement in desert soils. Water Resources Research, 24, 1877–1891.
Qian, J., Wang, L., Liu, Y., Wu, B., and Wang, X., 2015, Distribution of nitrate and its implication for the contaminant source in groundwater of Huaibei Plain, Anhui Province. Geosciences Journal, 19, 537–545.
Qu, H., 1991, Assessment of Groundwater Resources in the Arid and Semiarid Land of China. Science Press, Beijing, 457 p. (in Chinese)
Ronen, D. and Sorek, S., 2005, The unsaturated zone-a neglected component of nature. In: Nutzmann, G., Viotti, P., and Aagaard, P. (eds.), Reactive Transport in Soil and Groundwater: processes and models. Springer, Berlin, p. 3–15.
Scanlon, B.R., Keese, K.E., Flint, A.L., Flint, L.E., Gaye, C.B., Edmunds, W.M., and Simmers, I., 2006, Global synthesis of groundwater recharge in semiarid and arid regions. Hydrological Processes, 20, 3335–3370.
Scanlon, B.R., Stonestrom, D.A., Reedy, R.C., Leaney, F.W., Gates, J., and Cresswell, R.G., 2009, Inventories and mobilization of unsaturated zone sulfate, fluoride and chloride related to land use change in semiarid regions, southwestern United States and Australia. Water Resources Research, 45, W00A18. doi: 10.1029/2008WR006963
Smith, D.B., Wearn, P.L., Richards, H.J., and Rowe, P.C., 1970, Water movement in the unsaturated zone of high and low permeability strata by measuring natural tritium. Isotope Hydrology, 1, 73–87.
Solomon, D.K. and Cook, P.G., 2000, 3H and 3He. In: Cook, P.G. and Herzeg, A.L. (eds.), Environmental Tracers in Subsurface Hydrology. Springer, New York, p. 397–424.
Walker, G.R., Jolly, I.D., and Cook, P.G., 1991, A new chloride leaching approach to the estimation of diffuse recharge following a change in land use. Journal of Hydrology, 128, 49–67.
Winograd, I.J. and Robertson, F.N., 1982, Deep oxygenated groundwater: anomaly or common occurrence? Science, 216, 1227–1230.
Xu, Z., Li, Y., Tang, Y., and Han, G., 2009, Chemical and strontium isotope characterization of rainwater at an urban site in Loess Plateau, Northwest China. Atmospheric Research, 94, 481–490.
Yin, L., Hou, G., Tao, Z., and Li, Y., 2010, Origin and recharge estimates of groundwater in the Ordos plateau, People’s Republic of China. Environmental Earth Sciences, 60, 1731–1738.
Zhang, W., Tian, Z., and Zhang, N., 1996, Nitrate pollution of groundwater in northern China. Agriculture, Ecosystems & Environment, 59, 223–231.
Zhang, Z., Liu, F., Zhang, H., and Liu, E., 1990, Study of soil water movement and recharge rate of rainfall infiltration in aeration zone of loess by measuring natural tritium. Hydrogeology & Engineering Geology 29, 5–7.
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Huang, T., Yang, S., Liu, J. et al. How much information can soil solute profiles reveal about groundwater recharge?. Geosci J 20, 495–502 (2016). https://doi.org/10.1007/s12303-015-0069-3
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DOI: https://doi.org/10.1007/s12303-015-0069-3