期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 24, 页码 10671-10679出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL066830
关键词
sediment transport; tidal freshwater river; tidal freshwater forested wetland; oligohaline marsh; carbon accumulation
资金
- U.S. Geological Survey Mendenhall Research Fellowship Program
- U.S. Geological Survey National Research Program
- Aquatic Analysis and Consulting, LLC
We measured rates of sediment, C, N, and P accumulation at four floodplain sites spanning the nontidal through oligohaline Choptank and Pocomoke Rivers, Maryland, USA. Ceramic tiles were used to collect sediment for a year and sediment cores were collected to derive decadal sedimentation rates using Cs-137. The results showed highest rates of short- and long-term sediment, C, N, and P accumulation occurred in tidal freshwater forests at the head of tide on the Choptank and the oligohaline marsh of the Pocomoke River, and lowest rates occurred in the downstream tidal freshwater forests in both rivers. Presumably, watershed material was mostly trapped at the head of tide, and estuarine material was trapped in oligohaline marshes. This hydrologic transport bottleneck at the head of tide stores most available watershed sediment, C, N, and P creating a sediment shadow in lower tidal freshwater forests potentially limiting their resilience to sea level rise.
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