四川省岷江冷杉对气候变化的响应及其潜在分布格局
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四川省省财政专项项目(2020CZZX07);国家重点研发计划项目(2016YFC0502104)


Response of Abies faxoniana to future climate change and its potential distribution patterns in Sichuan Province
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    摘要:

    四川省是我国气候变化的敏感区之一,区域气候的暖干化趋势严重影响植物物种组成与分布。岷江冷杉(Abies faxoniana)作为我国特有种,其分布的动态变化对气候变化具有十分重要的指示作用。基于现有岷江冷杉分布数据、气候、土壤、地形等环境因子,运用最大熵模型(MaxEnt)预测当代气候条件下岷江冷杉潜在分布区,并分析未来时期(2050s和2070s)不同气候变化情景下(RCP2.6、RCP4.5和RCP8.5)岷江冷杉潜在适生分布区,筛选影响岷江冷杉分布的主导环境因子及阈值,探讨岷江冷杉分布对气候变化的响应机制。结果表明:(1)当前岷江冷杉的高适生区集中分布于岷江流域上游地区,在未来两个时期岷江冷杉潜在中、高适生区的面积较当代气候条件下适生区面积均有所增加,且适生区总体向四川南部扩张,北部适宜生境丧失。(2)岷江冷杉潜在中适生区在低排放浓度下(RCP2.6)面积占比最高,而潜在高适生区在高排放浓度下(RCP8.5)的面积占比最高。(3)影响岷江冷杉分布的主要环境因子分别是:降水季节性变异系数、气温年变化幅度、年降水量和海拔(累计贡献>70%)。适宜岷江冷杉潜在分布的环境条件是气温年变化幅度29.3-32.5℃,降水季节性变异系数76.5-85.4,年降水量694.1-791.7 mm,以及海拔2310-3757 m。研究预测了岷江冷杉潜在分布区在不同气候变化条件下的变化格局,能够为岷江冷杉未来的更新与恢复以及大熊猫栖息地的迁移与保护提供指引。

    Abstract:

    Being sensitive to climate change, Sichuan Province (China) has been seriously affected by the warming and drying regional climate. In particular, Abies faxoniana, an endemic species in China that forms the habitats for giant pandas, has been a research focus. Understanding how Abies faxoniana responds to the climate change is useful to guide future activities to protect or restore the forests. To predict how Abies faxoniana distribution may change in the future, we firstly used an ecological niche model to determine the suitable climate for Abies faxoniana based on current climate and species distribution. Then, we projected the potential suitable distribution areas for Abies faxoniana in two future periods (2050s and 2070s) at three different climate change scenarios (RCP2.6, RCP4.5, and RCP 8.5). Lastly, we explored the key environmental factors and thresholds that drived Abies faxoniana distribution change. The model results suggested that:(1) high suitable areas of Abies faxoniana were concentrated in the upper reaches of the Minjiang River Basin in contemporary. In the future two periods, the area of the potential medium and highly suitable areas for Abies faxoniana would increase compared with the suitable areas under contemporary climatic conditions, and the suitable areas would expand to southern Sichuan Province, while the suitable habitats in the north would be degenerated. (2) The potential moderately suitable area of Abies faxoniana had the highest area proportion under the low emission concentration (RCP2.6), while the potentially highly suitable area had the highest area under the high emission concentration (RCP8.5). (3) The key environmental drivers for the shift of potential distribution of Abies faxoniana were precipitation seasonality, temperature annual range, annual precipitation, and altitude (cumulative contribution >70%). The suitable climate conditions for Abies faxoniana were temperature annual range from 29.3-32.5℃, precipitation seasonality from 76.5-85.4, and annual precipitation 694.1-791.7 mm. The model results highlighted the key drivers for Abies faxoniana distribution shift in the future, and the areas that were prune to climate change. The model results may help guide future renewal and restoration of Abies faxoniana, as well as protection and migration of giant panda living habitats.

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潘少安,李旭华,冯秋红,刘兴良,孙建新.四川省岷江冷杉对气候变化的响应及其潜在分布格局.生态学报,2022,42(10):4055~4064

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