Estimating groundwater recharge following land-use change using chloride mass balance of soil profiles: a case study at Guyuan and Xifeng in the Loess Plateau of China |
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| Authors: | Tianming Huang Zhonghe Pang |
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| Institution: | 1. Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, 19 Beituchengxilu Rd., Beijing, 100029, China
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| Abstract: | Groundwater recharge is affected by land use in (semi)arid areas. A new application of the chloride-mass-balance approach has been developed to estimate the reduction in groundwater recharge following land-use change by comparing chloride concentrations below the root zone and above the base of the chloride accumulation zone, before and after the land-use conversion. Two sites in the Loess Plateau of central China have been selected for study. Results from the Guyuan terrace region show that groundwater recharge beneath natural sparse small-grass was 100?mm/year, but the conversion to winter wheat about 100?years ago has reduced groundwater recharge to 55?mm/year. At the Xifeng Loess Plain the conversion from winter wheat, with groundwater recharge at 33?mm/year, to apple orchard 7?years ago has led to chloride accumulation to 5?m below land surface, suggesting the recharge rate has been reduced. This is in agreement with previous studies in these areas which have shown that the regional afforestation and other land-use conversions have resulted in deep soil desiccation and have caused an upper boundary to form with low matrix potential, thus preventing the soil moisture from actually recharging the aquifer. |
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