This is only to my knowledge, so I'm extremely sorry if it's wrong, but if it's correct, glad to help
Soil is a renewable resource that can be used in a sustainable manner. Fertility of soil can be sustained by protecting topsoil from erosion and contamination. Because soil fertility is replenished by decomposition of organisms, it is necessary to ensure that the natural life cycle of plants and wild animals is not disrupted. That is why reforestation is an effective measure against land degradation.