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干旱区内陆河流域地下水循环演变与生态效应研究-进展与挑战

Research on the evolution of groundwater cycle and ecological effects in inland river basins in arid areas: progress and challenges

  • 摘要: 干旱区内陆河流域生态环境脆弱,对气候变化敏感,地下水是维持生态系统稳定的关键要素。受气候变化以及跨流域调水灌溉、作物种植、地下水开采等人类活动驱动,导致可更新利用的水资源减少、地下水位持续下降,生产、生活与生态用水矛盾突出。总结干旱区内陆河流域尺度地下水循环演变与生态效应研究进展,亟需从综合考虑自然和人类活动双重影响下地下水循环演变及其气候与生态环境效应的分析、模拟与预测方面开展研究,深入认识地下水循环演变的驱动机制及其在干旱区生态系统中的作用机理,研发考虑地下水开采、河流输水与地下水侧向流影响的陆面生态水文模式与气候模式系统,从地下水、土壤水、河流径流与植被相互作用的耦合系统角度,定量评估地下水文与生态系统过程的人类活动影响,揭示地下水循环与生态系统互馈机理;结合地下水生态功能评价模型确定地下水生态功能预警征兆阈值,由此利用流域水资源调控多目标管理优化模型调控地下水资源,提出变化环境下的天然绿洲恢复方案。这对于提高地下水循环演变与生态多过程耦合关系的认识、改进干旱区地下水资源管理以及促进生态环境健康发展具有重要意义和价值。

     

    Abstract: The ecological environment of inland river basins in arid areas is fragile and sensitive to climate change and where groundwater is a key factor to maintain the stability of the ecosystem. Driven by climate change and human activities such as Inter-basin water transfer irrigation, crop planting, and groundwater exploitation, the amount of water resources that can be renewed and used decreases and the groundwater level continues to decline, and the contradiction between production, living and ecological water use is prominent. To summarize the research progress on groundwater cycle evolution and ecological effects at the basin scale in arid areas, it is urgent to study groundwater cycle and its climate and ecological environmental effects in three aspects of analysis, simulation and prediction, to deeply understand the driving mechanism of groundwater cycle evolution and its mechanism in arid region ecosystems, and to develop land surface ecohydrological model and climate model systems. From the perspective of the coupling system of river runoff and vegetation interaction, the impact of human activities on groundwater hydrology and ecosystem processes was quantitatively evaluated, and the interaction mechanism between groundwater cycle and ecosystem was revealed. Combined with the groundwater ecological function evaluation model, the early warning threshold of groundwater ecological function was determined, and the multi-objective management optimization model of water resources regulation and control in the basin was used to regulate groundwater resources, and the restoration scheme of natural oasis under the changed environment was proposed. This study is of great significance and value for improving the understanding of the coupling relationship between groundwater cycle evolution and ecological multi-process, improving the management of groundwater resources in arid areas, and promoting the healthy development of ecological environment.

     

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