基于种间竞争模型的毒杂草入侵空间分布模拟研究

以天然草场中毒杂草与可食牧草为研究对象,在种间竞争的生态数学模型的基础上引入入侵扩散因素建立毒杂草入侵扩散模型。采用元胞自动机理论将竞争模型扩展到空间网络进行模拟研究,分析毒杂草属的空间分布类型,为毒杂草的控制提供数据支持。研究表明:(1)在入侵扩散作用下,毒杂草与可食牧草的共存平衡点由一个增加为两个,增加了共存的可能性;(2)入侵扩散作用影响了毒杂草种群的空间分布特征,减少了种群空间分布的聚集程度。

Spatial distribution of poisonous weed invasion based on inter-species competition models

In the present study, a spatial diffusion model of poisonous weed invasion by using inter-species competition model was developed based on poisonous weeds and edible forage in native pastures. Using the cellular automata theory, the competition model was extended to the spatial network to simulate and study the spatial distribution patterns of poisonous weeds, which will provide data supporting their control. The results showed that (1) under the influence of invasion and diffusion, the coexistence equilibrium point of the poisonous weeds and the edible grass could be increased by an increase of two, which increased the possibility of coexistence; and (2) the spatial distribution of the weed population was affected by invasion and diffusion, and the aggregation of the spatial distribution of the population was reduced.