globalchange  > 气候变化与战略
DOI: 10.5194/hess-23-4077-2019
论文题名:
Temporally dependent effects of rainfall characteristics on inter-and intra-event branch-scale stemflow variability in two xerophytic shrubs
作者: Yuan C.; Gao G.; Fu B.; He D.; Duan X.; Wei X.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期:10
起始页码: 4077
结束页码: 4095
语种: 英语
Scopus关键词: Catchments ; Drops ; Soil moisture ; Caragana Korshinskii ; Effects of rainfalls ; Influential factors ; Multiple correspondence analysis ; Rainfall characteristics ; Rainfall intensity ; Root zone soil moistures ; Stepwise regression ; Rain ; arid region ; catchment ; precipitation intensity ; raindrop ; rainfall ; semiarid region ; shrub ; soil moisture ; stemflow ; China ; Loess Plateau ; Caragana korshinskii ; Salix psammophila
英文摘要: Stemflow is important for recharging root-zone soil moisture in arid regions. Previous studies have generally focused on stemflow volume, efficiency and influential factors but have failed to depict stemflow processes and quantify their relations with rainfall characteristics within events, particularly for xerophytic shrubs. Here, we measured the stemflow volume, intensity, funneling ratio and time lags to rain at two dominant shrub species (Caragana korshinskii and Salix psammophila) and rainfall characteristics during 54 events at the semiarid Liudaogou catchment of the Loess Plateau, China, during the 2014-2015 rainy seasons. The funneling ratio was calculated as the ratio between stemflow and rainfall intensities at the inter-and intra-event scales. Our results indicated that the stemflow of C. korshinskii and S. psammophila, on average, started at 66.2 and 54.8 min, maximized 109.4 and 120.5 min after rain began, and ended 20.0 and 13.5 min after rain ceased. The two shrubs had shorter stemflow duration (3.8 and 3.4 h) and significantly larger stemflow intensities (517.5 and 367.3mmh-1) than those of rain (4.7 h and 4.5mmh-1). As branch size increased, both species shared the decreasing funneling ratios (97.7- 163.7 and 44.2-212.0) and stemflow intensities (333.8-716.2 and 197.2-738.7mmh-1). Tested by the multiple correspondence analysis and stepwise regression, rainfall amount and duration controlled stemflow volume and duration, respectively, at the event scale by linear relations (p 0.01). Rainfall intensity and raindrop momentum controlled stemflow intensity and time lags to rain for both species within the event by linear or power relationships (p 0.01). Rainfall intensity was the key factor affecting stemflow process of C. korshinskii, whereas raindrop momentum had the greatest influence on stemflow process of S. psammophila. Therefore, rainfall characteristics had temporally dependent influences on corresponding stemflow variables, and the influence also depended on specific species. © Author(s) 2019.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162886
Appears in Collections:气候变化与战略

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作者单位: Yuan, C., Institute of International Rivers and Eco-security, Yunnan University, Kunming, 650091, China, State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China, Yunnan Key Laboratory of International Rivers and Trans-boundary Eco-security, Yunnan University, Kunming, 650091, China; Gao, G., State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China, University of Chinese Academy of Sciences, Beijing, 100049, China; Fu, B., State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China, University of Chinese Academy of Sciences, Beijing, 100049, China; He, D., Institute of International Rivers and Eco-security, Yunnan University, Kunming, 650091, China, Yunnan Key Laboratory of International Rivers and Trans-boundary Eco-security, Yunnan University, Kunming, 650091, China; Duan, X., Institute of International Rivers and Eco-security, Yunnan University, Kunming, 650091, China, Yunnan Key Laboratory of International Rivers and Trans-boundary Eco-security, Yunnan University, Kunming, 650091, China; Wei, X., Department of Earth, Environmental and Geographic Sciences, University of British Columbia (Okanagan Campus, Kelowna, BC V1V 1V7, Canada

Recommended Citation:
Yuan C.,Gao G.,Fu B.,et al. Temporally dependent effects of rainfall characteristics on inter-and intra-event branch-scale stemflow variability in two xerophytic shrubs[J]. Hydrology and Earth System Sciences,2019-01-01,23(10)
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