Salinity, soil temperature, and water table depth versus soil CO₂ and CH₄ fluxes.

Abstract

<p>a) Soil pore water salinity versus soil CO₂ flux, b) soil temperature versus soil CO₂ flux, c) water table depth (WTD) versus soil CO₂ flux, d) soil pore water salinity versus soil CH₄ flux, e) soil temperature versus soil CH₄ flux, and f) water table depth (WTD) versus soil CH₄ flux by month and site over three years from five wetland sites (two <i>Phragmites australis</i>, two <i>Suaeda salsa</i>, one rice) located in the Liaohe Delta, China. When present, dashed lines depict important thresholds associated with soil pore water salinity <18 PSU (a, d) and soil temperature >18°C (b, e). For d, the polynomial regression has been re-drawn from [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0160612#pone.0160612.ref016" target="_blank">16</a>] and superimposed on data collected from the Liaohe Delta. R = Pearson Correlation Coefficient (P < 0.05 for all).</p