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Intrastorm stemflow variability of a xerophytic shrub within a water-limited arid desert ecosystem of northern China
Received:November 10, 2016  Revised:December 30, 2016  Click here to download the full text
Citation of this paper:YaFeng Zhang,XinPing Wang,YanXia Pan,Rui Hu,2017.Intrastorm stemflow variability of a xerophytic shrub within a water-limited arid desert ecosystem of northern China.Sciences in Cold and Arid Regions,9(5):495~502.
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Author NameAffiliationE-mail
YaFeng Zhang Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China zhangyafeng1986@gmail.com 
XinPing Wang Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
YanXia Pan Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
Rui Hu Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
基金项目:This study was supported by the National Natural Science Foundation of China (41530750, 41501108, 41371101) and the CAS "Light of West China" Program. The authors would like to express their gratitude to the associate editor and two anonymous reviewers for their constructive comments in improving the manuscript.
 
Abstract:An increasing number of studies in recent years has elucidated distinguishable effects of stemflow on hydrology and biogeochemistry within a variety of ecosystems. Nonetheless, no known studies have investigated the temporal variability of stemflow volume within discrete rainfall events for xerophytic shrubs. Here, stemflow was monitored at 5-min intervals using a tipping-bucket rain gage during the 2015 growing season for a xerophytic shrub (Caragana korshinskii) within a water-limited arid desert ecosystem of northern China. We characterized the stemflow temporal variability, along with rainfall, and found the temporal heterogeneity of rainfall clearly affected the timing of stemflow inputs into basal soil within discrete rainfall events. The rainfall threshold value for stemflow generation is not a constant value but a range (0.6~2.1mm, with an average of 1.1 mm) across rainfall events and is closely associated with the antecedent dry period. Time lags existed between the onset of rainfall and the onset of stemflow, and between rainfall peaks and stemflow peaks. Our findings are expected to be helpful for an improved process-based understanding of the temporal stemflow yield of xerophytic shrubs within water-limited arid desert ecosystems.
keywords:stemflow  temporal variability  xerophytic shrub  antecedent dry period  time lag
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