Soil organic matter is not homogenous but is a mixture of many organic matters with different chemical compositions and physical qualities. This chemically and kinetically heterogeneous material comprises a mixture of plant and microbial residues of various compositions and with different decomposition rates, as well as their transformation products, in addition to refractory, long-residence-time macromolecular organic substances (kerogen, black carbon). Humification of biopolymers is determined by those environmental parameters (relief, climatic conditions), which define soil types too.
展开▼
