Table 6 Pearson’s correlation coefficients (r) for various functional groups and pore properties with water-holding capacity (WHC) and cation exchange capacity (CEC) in rice straw and rice straw-derived biochar.

From: Transformations in physicochemical properties and pore structure of biochar derived from rice straw revealed by synchrotron techniques

 

%Open-pore porosity

%Closed-pore porosity

%Total porosity

Total pore number

Total pore

volume

Macropore (> 100 μm) volume

O–H cellulose

C–H cellulose

aromatic skeleton

O–H phenolic

WHC

0.981**

− 0.963**

0.981**

− 0.504

0.962**

0.963**

− 0.907*

− 0.971**

0.877*

0.855*

CEC

0.912*

− 0.931**

0.911*

− 0.234

0.961**

0.961**

− 0.935**

− 0.924**

0.709

0.678

  1. Statistically significant correlations are denoted by * (p < 0.05) and ** (p < 0.01).
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