| Impacts of changes in land use on groundwater recharge on Baicao loess tableland |
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| DOI：10.7606/j.issn.1000-7601.2019.03.33 |
| Key Words: soil moisture land use changes deep leakage chloride mass balance method loess tableland |
| Author Name | Affiliation | | HUANG Ya-nan | College of Natural Resources and Environment, Northwest A ＆ F University, Yangling, Shaanxi 712100, China | | LIN Guo-wei | College of Natural Resources and Environment, Northwest A ＆ F University, Yangling, Shaanxi 712100, China | | LI Zhi | College of Natural Resources and Environment, Northwest A ＆ F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To evaluate the impacts of changes in land use on groundwater recharge,we sampled 10 m soil profiles under four types of land uses (farmlands, apricot orchards, apricot-caragana intercropping lands, and apricot-alfalfa intercropping lands) on Baicao loess tableland. After determining the soil water contents and chloride contents in soil water, we quantified the land use change impacts on groundwater based on some indices including soil water content, water storage, desiccation, and deep drainage. Different types of land uses have impacts on soil water with varying magnitudes and depths. The averaged soil water contents across the 10 m profiles were in the order of farmlands > apricot orchards> apricot-caragana intercropping lands >apricot-alfalfa intercropping lands. The two intercropping lands with apricot had soil water contents that were very close to the wilting point in the 0~5 m soil profiles, which subsequently resulted in moderate or even severe desiccation. But, the desiccation was alleviated with the depth, especially in the soil of 5~10 m deep. The deep drainages of soil water under the four land uses ranged from 8.8 to 13.6 mm·a-1, accounting for 4.0% of average annual precipitation. Since the changes from farmlands to other types occurred within last 10 years, the impacts of the land use changes on the groundwater recharge were not significant though their effects on soil water contents were large. |
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