期刊
JOURNAL OF HYDROLOGY
卷 263, 期 1-4, 页码 92-104出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-1694(02)00064-1
关键词
evapotranspiration; forested wetlands; pine flatwoods; uplands; water balance
Hydrology plays a critical role in wetland development and ecosystem structure and functions, Hydrologic responses to forest management and climate change are diverse in the Southern United States due to topographic and climatic differences. This paper presents a comparison study on long-term hydrologic characteristics (long-term seasonal runoff patterns. water balances. storm flow patterns) of three watersheds in the southern US. These three watersheds represent three types of forest ecosystems commonly found in the lower Atlantic coastal plain and the Appalachian upland mountains, Compared to the warm, flat. and shallow groundwater dominated pine flatwoods on the coast, tire inland upland watershed was found to have significantly higher water yield, Precipitation/Hamon's potential evapotranspiration ratio (1.9 for upland vs 1.4 and 0.9 for wetlands), and runoff/precipitation ratio (0.53 +/- 0.092 for upland vs 0.30 +/- 0.079 and 0.13 +/- 0.094 for wetlands), Streamflow fi-orn flatwoods watersheds generally are discontinuous most of the years while the upland watershed showed continuous flows in most years. Storm flow peaks in a cypress-pine flatwoods system were smaller than that in the upland watershed for most cases, but exceptions occur-red under extreme wet conditions. Our study concludes that climate is the most important factor in deter-mining the watershed water balances in the southern US. Topography effects streamflow patterns and stormflow peaks and volume. and is the key to wetland development in the southern US. (C) 2002 Elsevier Science B.V. All rights reserved.
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