Table 1.
General soil characteristics for the garden and field fertilization of natural vegetation experiments
| Sand–silt–clay (%) | Rock and gravel (%) | Total soil N (g m−2) | Extractable P (ppm)a | pH | Bulk density (g cm−3) | N deposition (kg ha−1)b | |
|---|---|---|---|---|---|---|---|
| Garden | 87–11–3 | 17.1 (0.8)c | 13.3 (0.8) | 8.5 (0.4) | 6.96 (0.03) | 1.64 (0.01) | NA |
| Joshua Tree National Park | |||||||
| PJ-low N | 74–22–3 | 39.1 (2.6) | 31.7 (2.2) | 9.3 (0.8) | 8.10 (0.04) | 1.81 (0.04) | 6.2 |
| PJ-high N | 88–11–1 | 24.5 (1.8) | 37.4 (1.4) | 9.2 (0.7) | 7.13 (0.06) | 1.38 (0.04) | 12.4 |
| CB-low N | 83–11–6 | 28.6 (1.6) | 17.7 (0.05) | 2.7 (0.2) | 7.92 (0.01) | 1.63 (0.03) | 3.8 |
| CB-high N | 88–10–2 | 25.3 (0.9) | 31.6 (1.1) | 6.7 (0.4) | 7.10 (0.01) | 1.61 (0.02) | 6.6 |
Means presented with SEs in parentheses where available. PJ Piñon-juniper woodland, CB creosote bush. NA not applicable
aOlsen-P extraction method
bTotal wet + dry N deposition measured in 2005 using throughfall and interspace bulk resin collectors (M. Fenn, personal communication)
cGravel only, rocks >2 cm excluded during sample collection