Chronic Nitrogen Amendment Plots
The Chronic N study includes a total of eight different plots in two stands, pine and hardwood, which are coded as follows:
| Treatment | Numeric Key |
Treatment Key |
|||
|---|---|---|---|---|---|
| Pine Control |
1
|
PC | |||
| Pine High N |
2
|
PH or P150 | |||
| Pine Low N |
3
|
PL or P50 | |||
| Hardwood Control |
4
|
HC | |||
| Hardwood High N |
5
|
HH or H150 | |||
| Hardwood Low N |
6
|
HL or H50 | |||
| Pine N + Sulfur |
7
|
PNS | |||
| Hardwood N + Sulfur |
8
|
HNS | |||
Key to Tree Species.
Four primary species have been collectedathroughout the duration of the study.
| Treatment | Common Name | Latin Name | Abbreviation | ||
|---|---|---|---|---|---|
| Pine Stand | Red Pine | Pinus resinosa Ait. | PIRE | ||
| Hardwood Stand | Red Maple | Acer rubrum L. | ACRU | ||
| Black Oak * | Quercus velutina Lam. | QUVE | |||
| Black Birch | Betula lenta L. | BELE | |||
| *NOTE: QUVE includes both black and red oak
(Quercus rubra L.) for both litter and green foliage sampling. PIRE litter is designated -G and -B for green and brown, respectively. |
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