| 摘要: 研究建立了农业用水-水资源-城市人口非线性动力学模型，并探讨了农业用水的生态效应和有关稳定性问题。研究结果表明水资源-城市人口-农业用水三者之间关系是非常复杂的非线性关系，盲目、超规模的农业用水将使城市城镇化抑或 城镇农村化；稳定的城市人口与农作物生物总量成线性关系，低灌溉效率下农业用水的增加非但不能使农业增产，还将导致农作物生物总量的减少和城市规模的减小；为达到增加农业用水时既可使农业增产，又支持城市扩大的目的，惟一途径是提高农业灌溉效率。 |
| 关键词: 农业生产 水资源 城市人口 模式 |
| 中图分类号: |
| 基金项目:国家“211工程”重点学科重大项目“不同时空尺度环境演变和生态建设”资
助 |
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| Ecological and social effects of water used in agriculture |
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SUN Yan, LIN Zhen-Shan
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College of Geography,Nanjing Normal University,Nanjing 210097,China
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| Abstract: A nonlinear dynamic model of water used in agriculture-water resources-city population is established and also the ecological effect of water used in agriculture and its stability of this model are stated in the paper.The results show that the excess water used in agriculture may lead the suburb area to urbanism or the town to ruralism;the stable city population is linear to the total crops yield;with a very low irrigation rate,more water used in agriculture can not lead to the increase of crops yield,but the decrease of the crops yield and reducing of the city scale;in order to increase more agriculture～used water to increase the corps yield and to expand the city scale,[JP2]the only way is to improve the agricultural irrigation rate. |
| Keyword: Agricultural production,Water resource,City
population,Model |
