Soil stoichiometric characteristics of intact, drained and restored wetlands

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Dan Dong, Christian von Sperber, Irena Creed, Pascal Badiou, Tim Moore

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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.

Resource Type:
Conference Presentation, SER2021

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