水资源变化对小开河引黄灌区生态

灌区通过农田水利体系把灌区范围沟通成为一个整体, 在自然和人工生态系统相互交叉融合作用下，使灌区生态系统有了良好的发展和演变。通过对小开河引黄灌区建设前后水资源条件的变化分析，探讨了水资源对灌区生态系统的结构变化及系统演变的影响。结果表明，灌区建设和水资源条件的改善与控制，会增加复合生态经济系统结构的层次性和复杂性，使生态经济系统日趋稳定和完善。

Impacts of Water Resources Changes on the Ecosystem of Xiaokaihe Yellow River Diversion Irrigation District

Irrigation system serves as a functional entity in the whole irrigation district. The ecosystem of irrigation district can develop and evolve towards the right direction under the intersection, amalgamation and interaction of natural and artificial ecosystems. This paper discusses the impacts of water resources structure changes on the irrigation district ecosystem structure transformation and evolvement through analysis of the changes in water resources structure before and after the construction of the Xiaokaihe Irrigation District. The results show that irrigation district construction and changes in water resource supply condition will increase hierarchy and complexity of a compound ecological economic system, and also make the pattern of this system stable and perfect .