John F. Elder Gerald L. Goddard William F. James Dale M. Robertson 2009 <p>A <span class="single_highlight_class">phosphorus</span> budget was constructed for Delavan Lake Inlet, a perennial riverine <span class="single_highlight_class">wetland</span> with submersed and floating aquatic vegetation in southeastern Wisconsin, to better understand the <span class="single_highlight_class">phosphorus</span> <span class="single_highlight_class">dynamics</span> in natural <span class="single_highlight_class">wetlands</span> and the role of <span class="single_highlight_class">wetlands</span> in lake-rehabilitation efforts. During the growing season, the inlet served as a net source of <span class="single_highlight_class">phosphorus</span>, primarily due to the release of <span class="single_highlight_class">phosphorus</span> from the sediments. More <span class="single_highlight_class">phosphorus</span> was released from the sediments of the inlet (600 kg) than was input from the upstream watershed (460 kg). This release was caused by high pH associated with high photosynthetic activity. During the remainder of the year, the inlet served as a net sink for <span class="single_highlight_class">phosphorus</span>, <span class="single_highlight_class">retaining</span> 6% of die <span class="single_highlight_class">phosphorus</span> input from the watershed. Over the entire year, this <span class="single_highlight_class">wetland</span> was a net source of over 500 kg of <span class="single_highlight_class">phosphorus</span> to downstream Delavan Lake. A constructed riverine <span class="single_highlight_class">wetland</span> upstream of Delavan Lake Inlet demonstrated a similar periodic release of <span class="single_highlight_class">phosphorus</span>. However, in this case, the summer release of <span class="single_highlight_class">phosphorus</span> was less than that trapped during the remainder of the year. The constructed <span class="single_highlight_class">wetland</span> served as a net sink for approximately 20% of the input <span class="single_highlight_class">phosphorus</span> on an annual time scale. The role of existing and constructed <span class="single_highlight_class">wetlands</span> as <span class="single_highlight_class">phosphorus</span> traps is complex. <span class="single_highlight_class">Wetlands</span> can act as a source or a sink for <span class="single_highlight_class">phosphorus</span> depending on the ambient conditions in die <span class="single_highlight_class">wetland</span>. Howa <span class="single_highlight_class">wetland</span> fits into a rehabilitation plan depends upon its net <span class="single_highlight_class">retention</span> efficiency and the importance of the periodic releases of <span class="single_highlight_class">phosphorus</span> to downstream waters.</p> application/pdf 10.1080/07438149809354353 en The North American Lake Management Society Dynamics in phosphorus retention in wetlands upstream of Delavan Lake, Wisconsin article