引入生态位，可以给每一个农村居民点用地元胞赋予不同的生态位：包括农业发展生态位、城市发展生态位、原地改造生态位。
In the cellular automaton model , the author introduces an important concept of ecology & niche and each cellular can be given a different niche , including eco-agriculture niche , urban development niche and site transformation niche .
城市发展位