<p><sup>a</sup>. Depths = 0–15 cm and 15–25 cm.</p><p><sup>b</sup>. Locations = upstream and downstream locations.</p><p><sup>c</sup>. Types = river wetland and constructed wetland.</p><p>Results with significant differences (<i>p</i> < 0.05) were shown in bold.</p><p>Two-way analysis of different factors.</p