The scientists studied phosphorus in Lake Dianchi sediment to understand how organic matter and particle size affect its release. They found that more organic matter in sediment reduces phosphorus release, while higher clay and silt content also inhibits release. Clay and silt help phosphorus move, while sand retains it. Phosphorus is mainly released in the northern part of the lake in the short term, but in the long term, it spreads to the central and southern areas. To control phosphorus release in Lake Dianchi, it's important to consider different forms of phosphorus, organic matter, and particle size, especially in the northern part of the lake.