| 摘要: |
| 以水量平衡、水沙平衡、水土平衡、水盐平衡、水质控制及生态系统的生物与景观指标等作为准则层,以28项指标作为因素层,利用改进的层次分析法(AHP)对评价指标进行定量化处理,建立了农业节水生态环境效益评价模型。模型首先将评价目标分层系列化,形成一个递阶有序的层次结构,再根据数学方法确定每一层次全部因素的权重,最后综合计算最低层相对于最高层的相对重要性次序的组合权值,并以此作为评价依据。模型可为内陆河流域灌区水资源开发利用、节水规划提供决策依据。以西北内陆河流域某灌区为例,利用所构建的模型计算灌区农业节水生态环境效益,结果表明:当灌溉水利用系数从0.3分别提高到0.4和0.5时,可分别提高生态环境效益8.5%和14.9%。理论分析与应用实例证明,利用改进层次分析法建立模型具有思路清晰、方法简便、系统性强等特点,模型计算结果稳定、精度高。 |
| 关键词: 农业节水,生态环境效益,评价模型,改进的层次分析法 |
| DOI：10.11841/j.issn.1007-4333.2006.04.094 |
| 投稿时间：2005-12-23 |
| 基金项目:国家自然科学基金资助项目(50279042)，西北农林科技大学科研专项基金资助项目 |
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| Evaluation model on environmental benefit of water saving agriculture in arid continental river basin of northwest China |
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| Abstract: |
| An evaluation model on environmental benefit of water saving agriculture in arid continental river basin was established by the modified analytical hierarchy process.The criteria layer of this model was constituted by the balances of water amount,soil-water,silt-water,and salt-water,the control of water quality and the creature and landscape in an environment system.The factor layer of the model includes twenty-eight evaluation indicators.These exponents were assessed quantitatively by the modified analytical hierarchy process.In this model the evaluation object was delaminated serially at first,and then the weighing values of all the factors in each layer were determined by the mathematical method.At last,the compounding weighing values of relative significance of the lowest layer to the highest layer were calculated synthetically.The model provides a decision-making reference for the water resource development and utilization and the water-saving program at irrigation district in arid continental river basin.As an example,the environment benefit on an irrigation district in arid continental river basin of northwest China was evaluated,by this model,and expounded.The estimated result manifested that the environmental benefit in the irrigation district could be enhanced by 8.5 per cent and 14.9 per cent when the water use coefficient was raised from 0.3 to 0.4 and 0.5 respectively.The theoretical analysis and application instance testified that the model established by the modified analytical hierarchy process had the features of strong logic,simple structure and stable precise. |
| Key words: water saving in agriculture,environment benefit,evaluation model,modified analytic hierarchy process |
