Ecological Archives E087-074-A4

Deanne C. Drake, Robert J. Naiman, and J. Scott Bechtold. 2006. Fate of nitrogen in riparian forest soils and trees: an 15N tracer study simulating salmon decay. Ecology 87:1256–1266.

Appendix D (Table D1). Recovery of 15N tracer from stem pools by mass (g) and percentage (%) of the original 1452 g N. All stem pools were most enriched at the 7-mo sampling (June 2004) when the leaves were actively growing and transporting assimilates to the roots.

 
Tracer N (g) and percent of total 15N application recovered
 
Time relative to tracer application
Heartwood
sap
Sapwood
sap
Heartwood structure
(1973–1983)
Sapwood structure
(1993–2004)
Phloem
Total
stem
Two weeks prior
Tracer N (g)
0.00
0.00
0.00
0.00
0.00
0.00
             
Three weeks after
Tracer N (g)
Total 15N application recovered (%)
1.81
0.12
0.28
0.02
0.00
0.00
0.04
0.00
0.19
0.01
2.33
0.16
             
Seven months after
Tracer N (g)
Total 15N application recovered (%)
11.92
0.82
18.75
1.29
0.00
0.00
1.95
0.13
6.71
0.46
39.34
2.71
             
Twelve months after
Tracer N (g)
Total 15N application recovered (%)
0.00
0.00
2.07
0.14
0.00
0.00
0.22
0.02
2.07
0.14
4.36
0.30

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