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000864347 1001_ $$0P:(DE-Juel1)173765$$aTian, Jie$$b0
000864347 245__ $$aDynamic response patterns of profile soil moisture wetting events under different land covers in the Mountainous area of the Heihe River Watershed, Northwest China
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000864347 520__ $$aUnderstanding the dynamic response of soil moisture to rainfall is critical for hydrological modelling in arid and semi-arid basins. However, little is known about rainfall-related soil moisture dynamics in arid high-altitude mountainous areas due to the absence of long-term high-resolution soil moisture observations. In this study, we investigated the dynamic response processes of profile soil moisture using data from a soil moisture monitoring network in the Qilian Mountains established in 2013 covering altitudes from 2,000–5,000 m a.s.l. To investigate the effects of different land covers on soil moisture response, we selected data from eight soil moisture stations with the same soil textural class and slope, but different land covers (scrubland, meadow, high coverage grassland (HCG), medium coverage grassland (MCG) and barren land). Several indices were evaluated to quantitatively describe soil moisture dynamics during the growing seasons of 2014–2016 based on soil wetting events. In addition, HYDRUS-1D simulations were used to further analyze the effect of land cover on soil moisture dynamics. Our results showed that soil moisture response amplitudes along profile are similar under MCG and barren land, but significantly different under scrubland, meadow and HCG. The rate of soil moisture increment decreased significantly with depth for all land covers, except for the HCG. The temporal pattern of soil moisture increase was highly variable along the soil profiles depending on land cover type. In particular, the difference of response time between the adjacent layers varied from negative values to 280 h with depth. Preferential flow occurred mostly in soils covered by scrubland. Water transferability was higher in deeply rooted soil. Furthermore, sensitivity analysis indicated that soil hydraulic properties are key factors in regulating profile soil wetting events. Our results show that the soil moisture response indices are useful to quantitatively characterize patterns in profile soil moisture dynamics, and provide new insights into the soil moisture profile wetting process (e.g. occurrence of preferential flow etc.), which helps for effective model parameterization and validation, in turn improving hydrological modelling in arid high-altitude mountainous areas.
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000864347 7001_ $$0P:(DE-HGF)0$$aZhang, Baoqing$$b1$$eCorresponding author
000864347 7001_ $$0P:(DE-HGF)0$$aHe, Chansheng$$b2
000864347 7001_ $$0P:(DE-HGF)0$$aHan, Zhibo$$b3
000864347 7001_ $$0P:(DE-Juel1)129440$$aBogena, Heye Reemt$$b4
000864347 7001_ $$0P:(DE-Juel1)129472$$aHuisman, Johan Alexander$$b5
000864347 773__ $$0PERI:(DE-600)2012165-9$$a10.1016/j.agrformet.2019.03.006$$gVol. 271, p. 225 - 239$$p225 - 239$$tAgricultural and forest meteorology$$v271$$x0168-1923$$y2019
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000864347 8564_ $$uhttps://juser.fz-juelich.de/record/864347/files/Tian2019_Postprint.pdf$$yPublished on 2019-03-15. Available in OpenAccess from 2021-03-15.
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