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Dan Dong, Christian von Sperber, Irena Creed, Pascal Badiou, Tim Moore
The stoichiometric relationships between organic carbon (C), nitrogen (N) and phosphorus (P) are important features of the functioning of wetlands. We conducted a synthesis of the C:N:P stoichiometry of soils in intact, drained and restored wetlands from literature and Canadian wetlands. Soil C:N ratio in freshwater marsh soils remains surprisingly constrained within a range of 10 to 30:1. Drainage and restoration show no significant effects on soil C:N ratio compared to intact wetlands, suggesting that C and N are lost and regained proportionally. Yet, soil C: P and N:P ratios are significantly smaller in drained and restored sites than intact wetlands, mainly induced by the decrease of C and N after drainage, instead of an enrichment of P. P concentrations are not consistent under any certain land management in our study and show very site-dependent, probably relevant to the soil texture, Al3+ and Fe3+ concentration and the parent material at different sites. Our results show that soil C:P and N:P ratios are positively related to soil C concentration (R2 = 0.86 and 0.79, respectively; both p < 0.001), suggesting the overriding control of soil OC on determining the soil stoichiometric characteristics in freshwater marshes.
Conference Presentation, SER2021
Pre-approved for CECs under SER's CERP program