Table 6 Linear correlation and regression between micronutrientsand enzymes (Y) and increasing soil depth (X) for charcoal production site (CPS)and non-charcoal production site.

From: Impact of charcoal production on soil micronutrients, enzyme activities, microbial composition, and biomass phosphorus in a derived savannah ecosystem of Nigeria

Soil parameters

Site

CPS

NPS

Correlationcoefficient (r)

Regression equation

Correlationcoefficient (r)

Regression equation

Copper

0.817

Y = 0.2467 + 0.00300 X

1.00

Y = 0.3000 + 0.000667 X

Cobalt

0.500

Y = 0.0900 + 0.000333 X

1.00

Y = 0.1000 + 0.000667 X

Iron

− 0.736

Y = 2.253–0.0180 X

− 0.866

Y = 1.6000–0.00400 X

Manganese

− 0.908

Y = 0.0367–0.00333 X

− 0.908

Y = 0.2367 – 0.00333 X

Zinc

− 0.214

Y = 1.663–0.0030 X

0.999

Y = 1.78333 + 0.009667 X

Pho

− 0.223

Y = 2.193–0.0023 X

− 0.569

Y = 1.8233–0.00133 X

Phy

0.0

Y = 0.00 + 0.0000X

0.0

Y = 0.00 + 0.00 X

Tsd

0.881

Y = 1.37 + 0.1683 X

− 0.967

Y = 15.55–0.2910 X

Dsr

0.874

Y = 0.793 + 0.01700 X

− 0.995

Y = 1.6200–0.01700 X

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