Table 6 Mean and standard deviation for the mean annual precipitation (MAP), mean annual temperature (MAT), sand, silt, clay, age, altitude, and pH in coniferous and deciduous tree stands. N = number of tree species
From: Influence of trees and associated variables on soil organic carbon: a review
Variables | Coniferous | Deciduous | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Max | Min | Mean | SD | N | Max | Min | Mean | SD | N | |
MAPÂ (mm) | 4000 | 327 | 1550 | 805 | 21 | 1450 | 73.0 | 916.0 | 419.0 | 18 |
MAT (oC) | 21.00 | − 1.0 | 12.42 | 8.73 | 20 | 27.00 | − 1.0 | 14.38 | 8.07 | 16 |
Sand (%) | 94.70 | 5.1 | 39.26 | 26.24 | 14 | 69.87 | 5.0 | 45.59 | 20.27 | 19 |
Silt (%) | 72.10 | 2.6 | 36.66 | 17.33 | 14 | 77.00 | 6.0 | 30.97 | 18.24 | 15 |
Clay (%) | 48.40 | 2.7 | 24.02 | 16.23 | 14 | 60.60 | 3.5 | 25.80 | 14.67 | 18 |
Age (yrs.) | 91.00 | 7.0 | 46.35 | 19.26 | 14 | 90.00 | 8.0 | 35.10 | 24.72 | 10 |
Altitude (m asl) | 3125 | 7.0 | 1038.78 | 705.78 | 25 | 3440 | 201 | 1085.6 | 729.3 | 21 |
pH | 7.10 | 3.4 | 4.84 | 0.87 | 25 | 8.33 | 3.4 | 5.40 | 1.15 | 28 |