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A detailed fixed nitrogen (N) mass balance was constructed for the Central ArizonaPhoenix (CAP) ecosystem. Input of fixed N input to the ecosystem was 98 Gg y1. Of this, humans deliberately imported or mediated the fixation of 51 Gg N y1; combustion processes added another 36 Gg y1. Fixation by desert plants, wet deposition, and surface water input accounted for 11% of total N input. Total fixed N...
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