Two-way analysis of different factors.

<p>^a. Depths = 0–15 cm and 15–25 cm.</p><p>^b. Locations = upstream and downstream locations.</p><p>^c. 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

National, regional, and local maps of the study area.

<p>Maps showing the (a) national, (b) regional, and (c) local geographical setting of the study area. In map (c), showing the location of the Xinxue River (XR) and Xinxue River Constructed Wetland (XRCW): A = upstream location of XRCW; B = downstream location of XRCW; C = upstream location of XR; D = downstream location of XR.</p

The spatial distribution of dissolved organic carbon (DOC).

<p>Bar plots showing the spatial distribution of dissolved organic carbon (DOC) in the Xinxue River (XR) and Xinxue River Constructed Wetland (XRCW). A = upstream location of XRCW; B = downstream location of XRCW; C = upstream location of XR; D = downstream location of XR. Bars sharing the same lowercase letter (a or b) are not significant at α = 0.05 (Duncan Test).</p

The spatial and vertical distribution of heavy fraction organic carbon (HFOC).

<p>Bar plots showing the spatial and vertical (0–15 cm vs. 15–25 cm) distribution of heavy fraction organic carbon (HFOC) in the Xinxue River (XR) and Xinxue River Constructed Wetland (XRCW). A = upstream location of XRCW; B = downstream location of XRCW; C = upstream location of XR; D = downstream location of XR. Bars sharing the same letter are not significant at α = 0.05 (Duncan Test).</p

The spatial distribution of light fraction organic carbon (LFOC).

<p>Bar plots showing the spatial distribution of light fraction organic carbon (LFOC) in the Xinxue River (XR) and Xinxue River Constructed Wetland (XRCW). A = upstream location of XRCW; B = downstream location of XRCW; C = upstream location of XR; D = downstream location of XR. Bars sharing the same lowercase letter (a or b) are not significant at α = 0.05 (Duncan test).</p

The spatial distribution of OC types.

<p>The spatial distribution of OC types.</p

Two-way analysis of different factors.

<p>^a. Depths = 0–15 cm and 15–25 cm.</p><p>^b. Locations = upstream and downstream locations.</p><p>^c. 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

Pearson correlation analysis among the factors in Xinxue River Constructed Wetland.

<p>** Correlation is significant at the 0.01 level (2-tailed).</p><p>* Correlation is significant at the 0.05 level (2-tailed).</p><p>Pearson correlation analysis among the factors in Xinxue River Constructed Wetland.</p

Number of days of exposure of <i>Alternanthera philoxeroides</i> ramets under different fluctuation treatments (FF1, FF2, FF3 and FF4) with their respective cycles of fluctuations (0, 3, 6 and 12 cycles) over a 96-day experimental growth period, for any particular level of submergence.

<p>Number of days of exposure of <i>Alternanthera philoxeroides</i> ramets under different fluctuation treatments (FF1, FF2, FF3 and FF4) with their respective cycles of fluctuations (0, 3, 6 and 12 cycles) over a 96-day experimental growth period, for any particular level of submergence.</p

Biomass allocation in <i>A</i>. <i>philoxeroides</i> under different water levels and fluctuation frequencies.

<p>Root mass ratio (A and D), Stem mass ratio (B and E) and Leaf mass ratio (C and F). Different letters denote significant differences (<i>p</i> ≤ 0.05) with Duncan’s test.</p