文章基本信息

标题：HYDROLOGIC RESPONSE OF A FORESTED SINKHOLE WETLAND TO DIFFERENT LAND MANAGEMENT SCENARIOS
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作者：A. Jason Hill ; Vincent S. Neary
期刊名称：Journal of Environmental Hydrology (ältere Jahrgänge)
印刷版ISSN：1058-3912
电子版ISSN：1996-7918
出版年度：2009
卷号：17
出版社：IAEH
摘要：This study employed the SPAW (Soil-Plant-Atmosphere-Water) model to simulate the hydrology of a forested sinkhole wetland on the Tennessee Highland Rim. Recent development activities have increased awareness of the potential adverse impacts of continued watershed development on the wetland plant community. The SPAW model was used to simulate hydrologic conditions over a 50 year period for two future land management scenarios (LMS�s) with 19.7 % (LMS 2) and 37.9 % (LMS 3) of the watershed converted to impervious surfaces. Published flooding tolerances, reported as an upper limit on growing season inundation, for individual tree species were used to assess the likely response of the existing plant community for each scenario. Dominant tree species at the site are sweetgum (Liquidambar styraciflua), red maple (Acer rubrum), willow oak (Quercus phellos), blackgum (Nyssa sylvatica), and green ash (Fraxinus pennsylvanica). Seepage rates during the growing season had a more dominant influence on growing season inundation than increased surface runoff from the future developments. The forested buffer is responsible for maintaining large seepage rates during the growing season and appears to be the most important aspect of future land management. Overall, development with impervious surfaces in the range of 20-25 % is unlikely to appreciably influence the existing plant community. This study demonstrates a simple modeling framework for addressing land management decisions in zero-order watersheds containing depression wetlands. Recommendations for improving performance of the SPAW model are provided.