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Table 5 Mean and standard deviation for the mean annual precipitation (MAP), mean annual temperature (MAT), sand, silt, clay, age, altitude, and pH in all types of tree species

From: Influence of trees and associated variables on soil organic carbon: a review

  Max Min Mean SD N
MAP(mm) 4000.00 73.00 1210.00 588.00 74
MAT(oC) 27.00 − 1.00 15.49 7.10 71
Sand (%) 94.70 2.60 43.20 23.74 50
Silt (%) 86.20 1.87 34.89 19.91 47
Clay (%) 60.60 3.50 23.51 14.31 51
Age (yrs.) 110.00 6.00 41.46 23.41 37
Altitude (m asl) 3440.00 6.00 1065.00 700.00 71
pH 8.33 3.30 5.23 1.02 89