Soil properties in south China vary depending on how the land is used, like forests or farmlands. As soil weathers, clay content increases but pH, nutrients, and organic matter decrease. Forest soils have lower nutrients than farmland soils. The main limitations for soil productivity are malnutrition, acidification, clay content, and low phosphorus and potassium availability. Different soil types have different limitations, with clay content becoming a major issue as soil weathers. It's important to use appropriate measures to improve soil based on its use and type.