A general model for plant resource competition and population structures

Resource competition is the most important driving factor in forming ecological structures at different scales. The self-organizing process of resource competition in plant ecosystems has three significant features: Characteristics, that is, the group has a medium number of individuals, huge individual differences, and only complex short-range interactions between individuals. This article starts from the perspective of ecosystem resources Starting from the general issues of competition and group structure, an ecological dynamics model that can explicitly describe resource competition among plant individuals is established, and based on the Mathematical characteristics, according to the two extreme forms of completely asymmetric competition and completely symmetric competition, numerical simulation experiments are designed respectively, and compared with non-competition experiments, Analyze the commonalities and differences in individual resource allocation and group structure characteristics under different forms of competition and different degrees of group competition. The results show that as the degree of competition increases, The structural characteristics of the ecosystem (top canopy coverage at different heights) under the two forms of competition deviate from the distribution corresponding to the no-competition situation, manifesting as tall canopy coverage. The proportion of the layer decreases, while the proportion of the low canopy increases, and the average height of the top canopy decreases, which is different from the conclusion of the classic competition model. In the case of completely asymmetric competition Under this condition, individual differences increase significantly. For example, the average competition degree of medium-height individuals and the average mortality rate of low-status individuals increase rapidly. The top layer of vegetation coverage area The half-height width of the canopy coverage curve gradually increases, and the standard deviation of the top canopy height increases, but the coverage of the tall canopy in the simulation area gradually becomes stable. And in In the case of completely symmetrical competition, individual differences are significantly lower than in the case of completely asymmetrical competition, and the average competition degree and average mortality rate at all heights increase. The top canopy coverage curve gradually shifts toward lower heights, and the coverage of tall canopies in the simulation area also gradually decreases. This paper proposes a research group The theoretical framework of body structure changing with competition degree can provide an important mathematical theoretical basis for the study of complex resource competition in ecosystems and be applied to the earth system. Design of multi-scale modeling framework for the land surface process model and vegetation dynamics model of the model.