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Table 2 Description of disturbance and environmental predictor variables for estimating above-ground biomass at the ground plot level

From: Model-based estimation of above-ground biomass in the miombo ecoregion of Zambia

Predictor variable Description Minimum Maximum Mean
Available soil water capacity (AWC) Volumetric fraction 12.1 15.2 14.0
Bulk density (Bulk) kg∙m−3 1299.6 1501.2 1378.9
Carbon Organic soil carbon content (g∙kg−1) 4.3 11.5 7.0
Cation Exchange Capacity (CEC) cmolc∙kg−1 7.7 21.8 12.3
Clay Percent volume 21.5 35.1 28.7
Coarse fragments (Crs.frg) Percent volume 2.2 17.0 9.5
Compound Topographic Index (CTI) Unitless. High values indicate higher potential soil moisture. 5.8 39.6 8.2
Distance from ground plot to district capital (D2cap) Euclidean distance (m) 5704 90,146 40,635
Distance from ground plot to nearest perennial river/stream (D2hydro) Euclidean distance (m) 91 26,194 7203
Distance from ground plot to nearest village or settlement (D2vill) Euclidean distance (m) 542 42,902 8948
Distance from ground plot to nearest improved road (D2road) Euclidean distance (m) 192 59,363 12,042
Fire history – early season (Fire.early) Total number of fires per pixel, Apr. 1 – Jul. 31 0.0 6.0 0.6
Fire history – late season (Fire.late) Total number of fires per pixel, Aug. 1 – Nov. 30 0.0 8.0 1.8
pH Unitless 59.0 67.8 62.6
Sand Percent volume 43.4 66.2 54.3
Silt Percent volume 9.9 22.8 17.0
Slope Percent 0.0 43.8 8.4
  1. Minimum, maximum, and mean values calculated from n = 64