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Canopy nitrogen and tree carbon uptake

Canopy-applied 15N is recovered aboveground about three times more than soil-applied N.

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What tree species was used?

Sitka spruce saplings.

How much more aboveground 15N from canopy vs soil N?

About three times as much tracer recovery.

Wood 15N retention from CNU vs soil?

About four times higher in wood.

Mean aboveground biomass at harvest?

370 ± 119 g per tree.

Canopy share of aboveground mass?

74 ± 5% of aboveground biomass was canopy.

When were deposition treatments applied?

February 2013 until March 2014.

CNU vs SNU needle δ15N by April 2014?

About 120% (CNU) versus 38% (SNU).

Control needle δ15N?

Near natural abundance (~−3.5%).

What do authors say common methods miss?

Omitting canopy N uptake can underestimate woody response to N deposition.

Why might CNU favor carbon storage?

N from CNU may favor high C/N woody biomass.

Height gain over 2013?

12.4 ± 5.8% of initial height.