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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
MAP (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