Distribution of nitrogen-15 tracers applied to the canopy of a mature spruce-hemlock stand, Howland, Maine, USA
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Oecologia. 160: 589-599.
In N-limited ecosystems, fertilization by N deposition may enhance plant growth and thus impact C sequestration. In many N deposition-C sequestration experiments, N is added directly to the soil, bypassing canopy processes and potentially favoring N immobilization by the soil. To understand the impact of enhanced N deposition on a low fertility unmanaged forest and better emulate natural N deposition processes, we added 18 kg N ha-1 year-1 as dissolved NH4NO3 directly to the canopy of 21 ha of spruce-hemlock forest.
Keywordsnitrogen-15 nitrate ammonium nitrogen deposition carbon sequestration Forest elemental cycling
Dail, David Bryan; Hollinger, David Y.; Davidson, Eric A.; Fernandez, Ivan; Sievering, Herman C.; Scott, Neal A.; Gaige, Elizabeth. 2009. Distribution of nitrogen-15 tracers applied to the canopy of a mature spruce-hemlock stand, Howland, Maine, USA. Oecologia. 160: 589-599.