Temporally dependent effects of rainfall characteristics on inter- and intra-event branch-scale stemflow variability in two xerophytic shrubs

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Temporally dependent effects of rainfall characteristics on inter- and intra-event branch-scale stemflow variability in two xerophytic shrubs
	Yuan, Chuan 2,4; Gao, Guangyao 2,3; Fu, Bojie 2,3; He, Daming 4; Duan, Xingwu 4; Wei, Xiaohua 1
刊名	HYDROLOGY AND EARTH SYSTEM SCIENCES
	2019-10-01
卷号	23 期号:10 页码:4077-4095
ISSN号	1027-5606
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 3 mmh(-1) ) than those of rain (4.7h and 4.5 mm h(-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 197.2-738.7 mm h(-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.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42470]
专题	生态环境研究中心_城市与区域生态国家重点实验室
作者单位	1.Yunnan Univ, Yunnan Key Lab Int Rivers & Trans Boundary Ecosec, Kunming 650091, Yunnan, Peoples R China 2.Yunnan Univ, Inst Int Rivers & Ecosecur, Kunming 650091, Yunnan, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Univ British Columbia, Dept Earth Environm & Geog Sci, Okanagan Campus, Kelowna, BC V1V 1V7, Canada
推荐引用方式 GB/T 7714	Yuan, Chuan,Gao, Guangyao,Fu, Bojie,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,2019,23(10):4077-4095.
APA	Yuan, Chuan,Gao, Guangyao,Fu, Bojie,He, Daming,Duan, Xingwu,&Wei, Xiaohua.(2019).Temporally dependent effects of rainfall characteristics on inter- and intra-event branch-scale stemflow variability in two xerophytic shrubs.HYDROLOGY AND EARTH SYSTEM SCIENCES,23(10),4077-4095.
MLA	Yuan, Chuan,et al."Temporally dependent effects of rainfall characteristics on inter- and intra-event branch-scale stemflow variability in two xerophytic shrubs".HYDROLOGY AND EARTH SYSTEM SCIENCES 23.10(2019):4077-4095.