Method for calculating carbon storage in mixed forest ecosystem

A method for calculating a carbon storage in a mixed forest ecosystem, comprising the following steps:

• S1:
• acquiring basic geographic data, meteorological data, an eco-physiological parameter, thinning management history data, and validation data;
• S2:
• proposing an improved biome-biogeochemical cycles (Biome-BGC) model suitable for simulating the carbon storage of the mixed forest ecosystem under a management by improving a phenology module, adding a thinning operation management module, and optimizing the eco-physiological parameter, based on an existing Biome-BGC model, specifically comprising:
• S201:
• developing a phenology model suitable for simulating a mixed forest by improving the phenology module based on an evergreen phenology model, specifically comprising:
• S2011:
• calculating start and end times of a transfer period of deciduous vegetation by defining a first parameter, wherein the first parameter is a proportion of a transfer growth period to a growing season of the deciduous vegetation;
• S2012:
• calculating a daily transfer amount of the mixed forest in different phenological periods by defining a second parameter, wherein the second parameter is a ratio of evergreen vegetation to the deciduous vegetation;
• and
• S2013:
• describing start and end times of a litterfall process of the deciduous vegetation by defining a third parameter, wherein the third parameter is a proportion of the litterfall process to the growing season of the deciduous vegetation;
• and calculating a daily litterfall amount of the mixed forest in different phenological periods based on the ratio of the evergreen vegetation to the deciduous vegetation;
• S202:
• adding the thinning operation management module to simulate an impact of thinning on the carbon storage of the mixed forest ecosystem;
• and
• S203:
• optimizing and analyzing the eco-physiological parameter through a flower pollination algorithm (FPA), and establishing a set of parameters suitable for simulating the carbon storage of the mixed forest ecosystem;
• S3:
• simulating, by taking the mixed forest as a research object, the carbon storage based on the improved Biome-BGC model;
• S4:
• validating the improved Biome-BGC model;
• S5:
• analyzing a sensitivity of the eco-physiological parameter by an extended Fourier amplitude sensitivity test (EFAST) method;
• and
• S6:
• selecting a highly sensitive parameter, and analyzing positive and negative effects of the highly sensitive parameter on the carbon storage by a path analysis method.