Hydrology and plant survival in excavated depressions near an earthen dam in north-central Texas |
| |
| Authors: | Lynde L Williams Paul F Hudak |
| |
| Institution: | (1) Department of Geography and Environmental Science Program, University of North Texas, PO Box 305279, Denton, TX 76203-5279, USA |
| |
| Abstract: | This investigation examined plant survival and water sources for small depressions excavated to build an earthen dam and nature
trail in north-central Texas, USA. These “inadvertent wetlands” occupy part of an outdoor education facility, overlying alluvial
deposits of the Trinity River. A large lake behind the earthen dam strongly influences surface water and groundwater levels
in the area. Excavated depressions receive direct precipitation, runoff, and groundwater inputs, losing water by seepage and
evapotranspiration. Hydroperiods varied with location and water input: excavations receiving groundwater held water year round;
others periodically desiccated. Groundwater-fed depressions had higher salinity; however, the highest average value (1,304 μS/cm)
was within the freshwater range. A total of 66 to 75% of emergent and floating wetland species planted in three depressions
survived after 2 years. The developing wetlands appear viable under hydrologic conditions typical of the study period. Ultimately,
variable hydroperiods among wetlands, and water level fluctuations within individual wetlands, may foster diverse plant-species
compositions. Depressed lake levels following long-term drought or increased water demands pose the greatest threat to the
developing wetlands. |
| |
| Keywords: | Wetlands Groundwater Plants Salinity Texas |
| 本文献已被 SpringerLink 等数据库收录！ |
|
