Running head: Role of DON losses in carbon sequestration Carbon Sequestration in Terrestrial Ecosystems Under Elevated CO2 and Temperature: Role of Dissolved Organic versus Inorganic Nitrogen Loss

We used a simple model of carbon-nitrogen (C-N) interactions in terrestrial ecosystems to examine the responses to elevated CO2 and to elevated CO2 plus warming in ecosystems with the same total nitrogen loss but that differed in the ratio of dissolved organic nitrogen (DON) to dissolved inorganic nitrogen (DIN) loss. We postulate that DIN losses can be curtailed by higher N demand in response to elevated CO2 but that DON losses cannot. We also examined simulations in which DON losses were held constant, were proportional to the amount of soil

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