期刊
WATER RESOURCES RESEARCH
卷 50, 期 12, 页码 9366-9384出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014WR015719
关键词
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资金
- National Science Foundation [EAR 1024652]
- National Science Foundation through the STC program via the National Center for Earth-surface Dynamics [EAR-0120914]
- Division Of Earth Sciences
- Directorate For Geosciences [1025076] Funding Source: National Science Foundation
- Office of Integrative Activities
- Office Of The Director [1443108] Funding Source: National Science Foundation
During floods, fluvial forces interact with riparian plants to influence evolution of river morphology and floodplain plant community development. Understanding of these interactions, however, is constrained by insufficient precision and control of drivers in field settings, and insufficient realism in laboratory studies. We completed a novel set of flume experiments using woody seedlings planted on a sandbar within an outdoor meandering stream channel. We quantified effects on local sedimentation and seedling loss to scour and burial across realistic ranges of woody plant morphologies (Populus versus Tamarix species), densities (240 plants m(-2) versus 24 m(-2)), and sediment supply (equilibrium versus deficit). Sedimentation was higher within Tamarix patches than Populus patches, reflecting Tamarix's greater crown frontal area and lower maximum crown density. Plant dislodgement occurred rarely (1% of plants) and was induced in plants with shorter roots. Complete burial was most frequent for small Tamarix that occurred at high densities. Burial risk decreased 3% for Populus and 13% for Tamarix for every centimeter increment in stem height, and was very low for plants >50 cm tall. These results suggest that Tamarix are proportionally more vulnerable than Populus when small (<20 cm tall), but that larger plants of both species are resistant to both burial and scour. Thus, plant morphological traits and development windows must be considered in addition to physical drivers when designing process-based restoration efforts on regulated rivers such as flow releases to benefit native tree species.
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