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Well, this is what I ended up writing. I think that covers how I understand it. Thanks!
Peatland ecosystems have demonstrated extremely high sensitive to water level fluctuations (Hirano et al., 2009; Keddy, 2010; Belger et al., 2011), and as consequence drier conditions created by changing climates, direct or indirect human caused drainage, deforestation and so on, can have lead to cessation of the peat accumulation and ultimately a collapse of the peat structure in some wetlands (Furukawa et al., 2005; Hirano et al., 2009) In example many tropical peatlands have in recent years come under immense pressure due to drainage caused degradation, and as a consequence research have shown that these ecosystems are now shifting from being net carbon sinks - to carbon sources (Furukawa et al., 2005; Canadell et al., 2007).
Belger, L., Forsberg, B., Melack, J., 2011. Carbon dioxide and methane emissions from interfluvial wetlands in the upper Negro River basin, Brazil. Biogeochemistry 105, 171–183.
Canadell, J., Pataki, D., Gifford, R., Houghton, R., Luo, Y., Raupach, M., Smith, P., Steffen, W., 2007. Saturation of the Terrestrial Carbon Sink, in: Canadell, J.G., Pataki, D.E., Pitelka, L.F. (Eds.), Terrestrial Ecosystems in a Changing World, Global Change — The IGBP Series (closed). Springer Berlin Heidelberg, pp. 59–78.
Furukawa, Y., Inubushi, K., Ali, M., Itang, A., Tsuruta, H., 2005. Effect of changing groundwater levels caused by land-use changes on greenhouse gas fluxes from tropical peat lands. Nutrient Cycling in Agroecosystems 71, 81–91.
Hirano, T., Jauhiainen, J., Inoue, T., Takahashi, H., 2009. Controls on the Carbon Balance of Tropical Peatlands. Ecosystems 12, 873–887.
Keddy, P.A., 2010. Wetland Ecology: Principles and Conservation, 2nd ed. Cambridge University Press.
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