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基于PLUS-InVEST模型的洮河流域土地利用与生境质量变化多情景模拟

Multi-scenario Simulation of Land Use and Habitat Quality Change in Tao River Basin Using PLUS-InVEST Model

  • 摘要: 土地利用变化对生境质量演变具有重要影响,探究不同情景下土地利用变化对生境质量的影响,为区域生态保护和土地资源可持续利用提供建议。本研究采用“历史分析-情景模拟-空间评估”框架,基于洮河流域2000—2020年历史土地利用数据,对过去20年流域土地利用变化及生境质量时空演变特征进行分析的基础上,整合PLUS-InVEST模型与空间自相关方法,系统解析不同情景下洮河流域土地利用与生境质量的时空演变及空间集聚特征。结果表明:(1)洮河流域过去20年土地利用变化主要表现为耕地和林地的相互转换,草地动态变化频繁,水域面积显著减少,建设用地和未利用地面积有所扩张,其生境质量处于一般水平且呈现先下降后上升的变化趋势。(2)到2030年,在自然发展情景和生态保护情景中,均呈现出耕地减少、林地、水域增加的趋势;在自然发展情景和耕地保护情景下,建设用地面积扩张明显,而草地面积减少最显著;综合来看,不论在何种情景中,草地和未利用地面积均呈现出稳定的减少态势。(3)2030年不同情景下洮河流域平均生境质量指数相较于2020年均有所提高,不同情境下生境质量指数排名从高到低依次为生态保护情景>自然发展情景>耕地保护情景,在生态保护情境下高—高集聚和低—低集聚区域减少明显,低—高集聚区域明显由流域东北部向中部开始扩散。未来积极践行生态保护举措是洮河流域推进可持续发展的最优路径。

     

    Abstract: Land use change has an important impact on the evolution of habitat quality. This study explores the impact of land use change on habitat quality under different scenarios and provides suggestions for regional ecological protection and the sustainable use of land resources. The study adopts the framework of “ historical analysis — scenario simulation — spatial assessment ”, analyzing data from 2000 to 2020 in the past 20 years. It integrates the PLUS-InVEST model and the spatial autocorrelation method to analyze the characteristics of land use and habitat quality in different river basins. The results show that: (1) Over the past 20 years, land use changes in the Taohe Basin are mainly reflected in the mutual conversion of cropland and forestland, frequent dynamic changes of grassland, a significant reduction in water area, and the expansion of construction land and unused land. The habitat quality is generally at a medium level, showing a trend of first declining and then rising. (2) By 2030, in both the natural development scenario and the ecological protection scenario, the decrease in cropland, forestland, and water area will increase. In the natural development scenario and the cropland protection scenario, the area of construction land will expand significantly while the grassland area will decrease the most. Overall, the areas of grassland and unused land will decrease steadily. (3) Compared to 2020, in 2030, the average habitat quality index in the Taohe Basin will vary across different scenarios. The ranking of the habitat quality index in the descending order is: ecological protection scenario, natural development scenario, and cropland protection scenario. In the ecological protection scenario, the high-high agglomeration and low-low agglomeration areas of the habitat quality index will decrease significantly, and the low-high agglomeration area will spread from the northeast to the central region. In the future, ecological protection measures are the best way to promote sustainable development in the Taohe Basin.

     

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