改写其养分便逐渐溶解并大量释放养分而随着破裂程度的增加和养分不断释放养分释放率在前7天较高且总体看来是呈先增后减趋势。

Rewritten: The nutrients gradually dissolve and are released in large quantities as the substrate breaks down. As the degree of breakdown increases and nutrients continue to be released, the nutrient release rate is relatively high in the first seven days, and overall, it shows an increasing trend followed by a decreasing trend.