Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6303534 | Journal of Arid Environments | 2013 | 7 Pages |
Abstract
We analyzed the relationship between soil water content (SWC) dynamics in mobile dunes to a depth of 100Â cm and precipitation patterns from June to July 2010 in the Horqin Sand Land. The precipitation was dominated by small events of 0.1-3.0Â mm, which accounted for 52% of the total events. Precipitation >20Â mm had the highest intensity, accounting for 50% of the total precipitation. SWC differed significantly among the soil layers: mean SWC was greatest from 80 to 100Â cm and lowest from 40 to 60Â cm. SWC from 0 to 100Â cm was significantly affected by relative humidity, water barometric pressure and minimum temperature, and the SWC of 0-40Â cm was obviously influenced by precipitation amount and wind velocity. Precipitation <5Â mm did not replenish SWC, precipitation between 5 and 20Â mm provided some replenishment to SWC from 0 to 40Â cm, and precipitation >20Â mm increased significantly SWC from 0 to 100Â cm. In addition, precipitation intensity significantly affected the infiltration rate, with higher intensity leading to deeper and faster infiltration. At longer intervals between precipitation events, SWC in each soil layer decreased continuously over time; however, SWC from 0 to 80Â cm changed little within the first 3 days, and SWC from 0 to 100Â cm started to decrease greatly after 5 days.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth-Surface Processes
Authors
S.X. Yao, C.C. Zhao, T.H. Zhang, X.P. Liu,