Subjects: Geosciences >> Geography submitted time 2024-07-04 Cooperative journals: 《干旱区研究》
Abstract： Lakes, as integral components of terrestrial ecosystems, are vital for regional economic growth and ecological security. Previous studies have primarily focused on typical or large lakes in the Xinjiang region, with comparatively less attention given to smaller lakes. This study analyzed the areal dynamics of 74 small and medium-sized lakes in Xinjiang from 1991 to 2020, conducting a comprehensive analysis of lakes at varying altitudes and with diverse geographical characteristics. The research uncovered that during 1991-2020, the total area of lakes in Xinjiang expanded from 167.98 km² to 400.51 km², with the most significant growth observed in mountainous lakes. Monthly scale analysis revealed pronounced seasonal characteristics in the areal changes of these mountainous lakes. Statistical analysis indicated divergent responses of lakes at different altitudes to climatic changes. The substantial enlargement of lakes in Xinjiang’s mountainous regions is primarily attributed to climate change, particularly the rise in average annual temperatures. In the plains, human activities, especially irrigation, were identified as the primary drivers of lake area changes, while the impact of climatic factors was relatively minor.
Subjects: Environmental Sciences, Resource Sciences >> Other Disciplines of Environmental Sciences, Resource Sciences submitted time 2021-03-02 Cooperative journals: 《干旱区研究》
Abstract：随着塔里木河流域水资源统一管理不断加强，塔里木河下游生态输水量增加，生态保护取得了阶段性成效。然而，水资源严格管理下的塔里木河下游水生态安全状况及变化过程如何，相关研究缺乏科学的评估。对此，本文利用塔里木河下游2000—2017年的水量、监测断面地下水埋深、胡杨新增生物量、植被覆盖度、干旱指数等指标数据，运用主成分分析法和综合指数法评价了其水生态安全状况，揭示了影响水生态安全的驱动要素及其变化特点。结果表明：2000—2017年，塔里木河下游的水生态安全综合评价指数由3.91上升到8.47，生态安全水平不断提高，经历了从中度警示区到较安全区的变化过程。影响水生态安全评价的主要要素是水文驱动要素和植被驱动要素，其中下泄水量、地下水埋深和植被多样性对下游水生态安全影响显著。以上研究为优化塔里木河下游生态输水模式提供重要的科学依据。
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