互花米草(Spartina alternflora)原产于北美洲东海岸，于上个世纪70年代被引入中国。由于其具有繁殖能力强、耐盐耐淹、光合效率强等特点，对我国滨海地区生态环境、社会经济发展造成重大影响，因此模拟和控制互花米草扩展对保护滨海湿地具有重要意义。本研究以互花米草典型扩散研究区上海崇明岛东滩为例，考虑互花米草无性分蘖扩散与种间竞争两方面因素，通过互花米草元胞自动机模型，结合遥感技术，模拟互花米草在崇明岛东滩的扩张动态，并揭示其无性扩张机制。互花米草空间扩散模型的模拟结果与遥感解译结果具有高度的一致性。该模型揭示了上海崇明岛东滩研究区互花米草的空间变化规律，能为崇明岛东滩控制互花米草入侵提供科学建议，并为研究其它外来入侵植物种群扩张提供理论依据与方法体系。

Spartina alterniflora is native to the east coast of North America originally, and was introduced to China in the 1970s. Due to its strong ability to reproduce, strong resistance to salt water, photosynthetic efficiency, etc, it has caused significant consequences to ecology and environment, socio-economic development in the coastal areas of China, and thus the simulation and control of S. alterniflora’s spread is of great significance for protecting coastal wetlands. This study selected Chongming Dongtan, Shanghai as the study area where the spread of S. alterniflora is prominent, and considered the asexual tillering propagation and interspecific competition of S. alterniflora using a cellular automata model. Further combined with remote sensing technology, the spread dynamics of S. alterniflora at Chongming Dongtan was simulated, and the mechanism of clonal expansion was analyzed. The predictions of the spread model of the S. alterniflora are consistent with the remote sensing results. The study elucidates the pattern of the spatial distribution of S. alterniflora at Chongming Dongtan, informs its invasion control, and provides references for relevant studies on other invasive plant species.