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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

机译:利用土壤剖面的氯离子质量平衡估算土地利用变化后的地下水补给量:以中国黄土高原的固原县和西峰县为例

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摘要

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.
机译:地下水补给受(半)干旱地区土地利用的影响。已开发出一种氯离子质量平衡方法的新应用,通过比较土地使用前后根部区域下方和氯离子累积区底部上方的氯离子浓度,估算土地利用变化后地下水补给量的减少。使用转换。已选择中国中部黄土高原的两个地点进行研究。固原梯田地区的结果表明,天然稀疏小草下的地下水补给量为100毫米/年,但大约100年前转化为冬小麦使地下水补给量减少至55毫米/年。在西峰黄土平原,从冬小麦(地下水补给量为每年33毫米/年)到7年前苹果园的转化已导致氯化物积累到地表以下5 m,这表明补给率已经降低。这与之前在这些地区的研究相吻合,这些研究表明,区域造林和其他土地利用的转换导致土壤深层干燥,并形成了低基质势的上边界,从而阻止了土壤水分的实际补给。含水层。

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    《Hydrogeology Journal》 |2011年第1期|p.177-186|共10页
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