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Soil moisture response to rainfall on the Chinese Loess Plateau after a long-term vegetation rehabilitation
Jin, Zhao1,2,3; Guo, Li2; Lin, Henry1,2,3; Wang, Yunqiang1; Yu, Yunlong1; Chu, Guangcheng1; Zhang, Jing1
AbstractThe Chinese Loess Plateau (CLP) is a unique Critical Zone with deep loess deposits, where soil moisture is primarily replenished by seasonal monsoon rainfall. However, the role of vegetation, coupled with complex topography, on rainwater infiltration on the CLP, especially after long-term revegetation for controlling erosion, is inadequately quantified. Over the growing season of 2016, we monitored soil moisture at the 30-min interval at 5 depths (10, 20, 40, 60, and 100cm) in an afforested catchment and a nearby catchment with natural regrowth of grasses. Two monitoring sites were established in each catchment, one in the downhill gully and the other in the uphill slope. We found that vegetation, topography, and rainfall attributes together determined rainwater infiltration and soil moisture replenishment. An accumulated rainfall amount of 9mm was required to trigger soil moisture response at 10-cm depth at the 2 grassland sites and the forestland uphill-slope site whereas 14mm of rainfall was required for the forestland gully site covered by dense undergrowth and trees. Rainfall events with larger sums and higher peak intensities permitted rainwater infiltration to deeper soil depths. However, no rain recharged soil moisture to 100-cm depth during the monitoring period. The forestland uphill-slope site showed the deepest wetting depth (up to 60-cm depth), fastest wetting-front velocity (up to 4cm/hr below 10-cm depth), and the most significant soil moisture increase (up to 15% cm(3)cm(-3) increase at 10-cm depth) after rainfall in the growing season. The grassland gully site had the highest soil water storage, whereas soil moisture was depleted the most at the forestland gully site. Findings of this study reveal the transient dynamics of soil moisture after rainfall on the CLP, which signifies the role of revegetation on rainwater infiltration in the loess Critical Zone.
KeywordCritical Zone Ecohydrology Infiltration Landform Soil Hydrology Vegetation Restoration
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
Project Number41573067、41401378、417904444 ; 2014370
WOS Research AreaWater Resources
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS
WOS SubjectWater Resources
WOS IDWOS:000435783100002
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorGuo, Li
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Shaanxi, Peoples R China
2.Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA
3.Xian AMS Ctr, Shaanxi Key Lab Accelerator Mass Spectrometry & A, Xian 710061, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Jin, Zhao,Guo, Li,Lin, Henry,et al. Soil moisture response to rainfall on the Chinese Loess Plateau after a long-term vegetation rehabilitation[J]. HYDROLOGICAL PROCESSES,2018,32(12):1738-1754.
APA Jin, Zhao.,Guo, Li.,Lin, Henry.,Wang, Yunqiang.,Yu, Yunlong.,...&Zhang, Jing.(2018).Soil moisture response to rainfall on the Chinese Loess Plateau after a long-term vegetation rehabilitation.HYDROLOGICAL PROCESSES,32(12),1738-1754.
MLA Jin, Zhao,et al."Soil moisture response to rainfall on the Chinese Loess Plateau after a long-term vegetation rehabilitation".HYDROLOGICAL PROCESSES 32.12(2018):1738-1754.
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