DOI: 10.5194/hess-19-3133-2015
Scopus记录号: 2-s2.0-84937140480
论文题名: Hydrological connectivity inferred from diatom transport through the riparian-stream system
作者: Martínez-Carreras N ; , Wetzel C ; E ; , Frentress J ; , Ector L ; , McDonnell J ; J ; , Hoffmann L ; , Pfister L
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 7 起始页码: 3133
结束页码: 3151
语种: 英语
Scopus关键词: Algae
; Catchments
; Chemical analysis
; Isotopes
; Phytoplankton
; Reservoirs (water)
; Runoff
; Soil moisture
; Soils
; End-member mixing analysis
; Hydrograph separation
; Hydrological connectivity
; Processing time
; Relative abundance
; Species assemblage
; Stable isotope data
; Streamwater chemistry
; Rivers
; alga
; diatom
; hillslope
; hydrological modeling
; rainfall-runoff modeling
; riparian zone
; stable isotope
; streamflow
; streamwater
; tracer
; water chemistry
; Belgium
; Luxembourg [Belgium]
; Weierbach Basin
; algae
; Bacillariophyta
; bryophytes
; Eukaryota
英文摘要: Diatoms (Bacillariophyta) are one of the most common and diverse algal groups (ca. 200 000 species, ≈ 10-200 μm, unicellular, eukaryotic). Here we investigate the potential of aerial diatoms (i.e. diatoms nearly exclusively occurring outside water bodies, in wet, moist or temporarily dry places) to infer surface hydrological connectivity between hillslope-riparian-stream (HRS) landscape units during storm runoff events. We present data from the Weierbach catchment (0.45 km2, northwestern Luxembourg) that quantify the relative abundance of aerial diatom species on hillslopes and in riparian zones (i.e. surface soils, litter, bryophytes and vegetation) and within streams (i.e. stream water, epilithon and epipelon). We tested the hypothesis that different diatom species assemblages inhabit specific moisture domains of the catchment (i.e. HRS units) and, consequently, the presence of certain species assemblages in the stream during runoff events offers the potential for recording whether there was hydrological connectivity between these domains or not. We found that a higher percentage of aerial diatom species was present in samples collected from the riparian and hillslope zones than inside the stream. However, diatoms were absent on hillslopes covered by dry litter and the quantities of diatoms (in absolute numbers) were small in the rest of hillslope samples. This limits their use for inferring hillslope-riparian zone connectivity. Our results also showed that aerial diatom abundance in the stream increased systematically during all sampled events (n = 11, 2011-2012) in response to incident precipitation and increasing discharge. This transport of aerial diatoms during events suggested a rapid connectivity between the soil surface and the stream. Diatom transport data were compared to two-component hydrograph separation, and end-member mixing analysis (EMMA) using stream water chemistry and stable isotope data. Hillslope overland flow was insignificant during most sampled events. This research suggests that diatoms were likely sourced exclusively from the riparian zone, since it was not only the largest aerial diatom reservoir, but also since soil water from the riparian zone was a major streamflow source during rainfall events under both wet and dry antecedent conditions. In comparison to other tracer methods, diatoms require taxonomy knowledge and a rather large processing time. However, they can provide unequivocal evidence of hydrological connectivity and potentially be used at larger catchment scales. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78471
Appears in Collections: 气候变化事实与影响
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作者单位: Luxembourg Institute of Science and Technology, Department Environmental Research and Innovation, Belvaux, Luxembourg; Global Institute for Water Security, University of Saskatchewan, Saskatoon, Canada; School of Geosciences, University of Aberdeen, Aberdeen, United Kingdom
Recommended Citation:
Martínez-Carreras N,, Wetzel C,E,et al. Hydrological connectivity inferred from diatom transport through the riparian-stream system[J]. Hydrology and Earth System Sciences,2015-01-01,19(7)