Which nutrient store holds the majority of the nutrients in the Australian savanna?

The nutrient store that holds the majority of the nutrients in the Australian savanna is the soil. The soil in the Australian savanna is rich in nutrients due to the decomposition of plant and animal matter. This nutrient-rich soil provides the necessary nutrients for the growth of various plant species found in the savanna. The nutrients in the soil are also essential for the survival of the animal species that inhabit the savanna as they rely on the plants for food.