Fungi play a crucial role in nutrient cycling in ecosystems. They are key decomposers, breaking down organic matter such as dead plants and animals into simpler compounds. Through this decomposition process, fungi release nutrients back into the soil, making them available for uptake by plants. Additionally, fungi form symbiotic relationships with plants, such as mycorrhizae, where they assist in nutrient absorption by the plant roots in exchange for sugars produced by the plant. Overall, fungi contribute significantly to the recycling of nutrients in ecosystems, promoting overall ecosystem health and productivity.