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
会议名称：《中国科学院地质与地球物理研究所第11届（2011年度）学术年会》
会议日期：2012年
学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学]
基 金：supported by the National Natural Science Foundation of China(Grant 40872162)
关 键 词：Groundwater recharge/water budget Unsaturated zone Chloride mass balance Land-use change China
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 *** sites in the Loess Plateau of central China have been selected for *** 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/*** 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 *** 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.