Lake ecosystem catastrophe early warning method

The invention discloses a lake-ecosystem catastrophe early-warning method. According to the method, by the adoption of ecosystem mutation detection results, and time nodes can be obtained, wherein at the time nodes, lake-ecosystem energy quality mutates, and that is to say, catastrophes occur; in this way, ecosystem energy quality critical points are selected, in combination with a lake-ecosystem catastrophe early-warning model which is established on the basis of ecosystem total phosphorus, total nitrogen and energy-quality time sequences, the corresponding total phosphorus concentration and total nitrogen concentration are obtained through calculation and serve as early-warning threshold values of a Taihu ecosystem, and results of the method are more suitable for the actual lake environment. According to the method, the problem can be solved that it is difficult for a traditional disturbance modulation testing method based on a critical slowdown principle to adapt to actual ecosystem interference factors, and the method is a more accurate and more practical lake-ecosystem catastrophe early-warning method.