Effect of biotic and abiotic factors on inter- and intra-event variability in stemflow rates in oak and pine stands in a Mediterranean mountain area

JOURNAL OF HYDROLOGY

卷:560

Article

Cayuela, C.¹  Llorens, P.¹  Sanchez-Costa, E.¹  Levia, D. F.^2,3  Latron, J.¹ 

[1] CSIC, Inst Environm Assessment & Water Res, IDAEA, Jordi Girona 18-26, ES-08034 Barcelona, Spain

[2] Univ Delaware, Dept Geog, Newark, DE 19716 USA

[3] Univ Delaware, Dept Plant & Soil Sci, Newark, DE 19716 USA

关键词: Stemflow;    Funneling ratio;    Intra-storm;    Inter-storm;    Pinus sylvestris;    Quercus pubescens;   

DOI  :  10.1016/j.jhydrol.2018.03.050

来源: Elsevier

【 摘 要 】

Stemflow, despite being a small proportion of gross rainfall, is an important and understudied flux of water in forested areas. Recent studies have highlighted its complexity and relative importance for understanding soil and groundwater recharge. Stemflow dynamics offer an insight into how rain water is stored and released from the stems of trees to the soil. Past attempts have been made to understand the variability of stemflow under different types of vegetation, but rather few studies have focused on the combined influence of biotic and abiotic factors on inter and intra-storm stemflow variability, and none in Mediterranean climates. This study presents stemflow data collected at high temporal resolution for two species with contrasting canopies and bark characteristics: Quercus pubescens Willd. (downy oak) and Pinus sylvestris L. (Scots pine) in the Vallcebre research catchments (NE of Spain, 42 degrees 12'N, 1 degrees 49'E). The main objective was to understand how the interaction of biotic and abiotic factors affected stemflow dynamics. Mean stemflow production was low for both species (similar to 1% of incident rainfall) and increased with rainfall amount. However, the magnitude of the response depended on the combination of multiple biotic and abiotic factors. Both species produced similar stemflow volumes and the largest differences were found among trees of the same species. The combined analysis of biotic and abiotic factors showed that funneling ratios and stemflow dynamics were highly influenced by the interaction of rainfall intensity and tree size. (C) 2018 Elsevier B.V. All rights reserved.

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