A cellular automata model for population expansion of Spartina alterniflora at Jiuduansha Shoals, Shanghai, China
A cellular automata model for population expansion of Spartina alterniflora at Jiuduansha Shoals, Shanghai, China
复制标题
DOI：
10.1016/j.ecss.2007.09.003
复制
发表时间：
2008-03
影响因子：
2.8
通讯作者：
Hua-mei Huang;Li-Quan Zhang;Yujuan Guan;Dong-Hui Wang
中科院分区：
文献类型：
--
作者：
Hua-mei Huang;Li-Quan Zhang;Yujuan Guan;Dong-Hui Wang
生物入侵对当地生态系统的影响越来越大，近年来引起了人们的广泛关注。互花米草（Spartina alterniflora）在长江口九段沙潮间带滩涂的扩展是一个典型的空间结构入侵的例子，可以模拟和应用战略控制措施。本文采用元胞自动机（CA）模型，结合遥感和地理信息系统（GIS）技术，模拟了互花米草（S.alterniflora）引入新滩后8a的扩展过程，研究了盐沼植被空间格局与生态过程的相互作用。结果表明，CA模型能较好地模拟松褐天牛种群动态。互花米草（alterniflora）和芦苇（Phragmites australis）在九段沙浅滩上的繁殖成功。这一结果有力地支持了这两个物种的空间抢占假说以及简单前进波前的射程扩展。在长江口，本地种芦苇与外来种芦苇处于同一生态位。互花但芦苇的分布区扩展速度远慢于芦苇。互花随着大量长江泥沙的淤积，九段沙浅滩的加积，S。预计互花米草在未来将持续很长一段时间。该研究为长江口湿地生物多样性保护和资源管理提供了重要的理论依据。
Biological invasion has received considerable attention recently because of increasing impacts on local ecosystems. Expansion of Spartina alterniflora, a non-native species, on the intertidal mudflats of Jiuduansha Shoals at the Yangtze River Estuary is a prime example of a spatially-structured invasion in a relatively simple habitat, for which strategic control efforts can be modeled and applied. Here, we developed a Cellular Automata (CA) model, in conjunction with Remote Sensing and Geographical Information Systems, to simulate the expanding process of S. alterniflora for a period of 8years after being introduced to the new shoals, and to study the interactions between spatial pattern and ecosystem processes for the saltmarsh vegetation. The results showed that the CA model could simulate the population dynamics of S. alterniflora and Phragmites australis on the Jiuduansha Shoals successfully. The results strongly support the hypothesis of space pre-emption as well as range expansion with simple advancing wave fronts for these two species. In the Yangtze River Estuary, the native species P. australis shares the same niche with the exotic species S. alterniflora. However, the range expansion rate of P. australis was much slower than that of S. alterniflora. With the accretion of the Jiuduansha Shoals due to the large quantity of sediments deposited by the Yangtze River, a rapid range expansion of S. alterniflora is predicted to last for a long period into future. This study indicated the potential for this approach to provide valuable insights into population and community ecology of invasive species, which could be very important for wetland biodiversity conservation and resource management in the Yangtze River Estuary and other such impacted areas.