Key Laboratory of Forest Genetics and Biotechnology of Ministry of Education, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China; College of Forestry, Nanjing Forestry University, Nanjing, 210037, China.
College of Forestry, Nanjing Forestry University, Nanjing, 210037, China.
J Environ Manage. 2022 Nov 15;322:116024. doi: 10.1016/j.jenvman.2022.116024. Epub 2022 Aug 30.
Climate change has a crucial impact on the distributions of plants, especially relict species. Hence, predicting the potential impact of climate change on the distributions of relict plants is critical for their future conservation. Liriodendron plants are relict trees, and only two natural species have survived: L. chinense and L. tulipifera. However, the extent of the impact of future climate change on the distributions of these two Liriodendron species remains unclear. Therefore, we predicted the suitable habitat distributions of two Liriodendron species under present and future climate scenarios using MaxEnt modeling. The results showed that the area of suitable habitats for two Liriodendron species would significantly decrease. However, the two relict species presented different habitat shift patterns, with a local contraction of suitable habitat for L. chinense and a northward shift in suitable habitat for L. tulipifera, indicating that changes in environmental factors will affect the distributions of these species. Among the environmental factors assessed, May precipitation induced the largest impact on the L. chinense distribution, while L. tulipifera was significantly affected by precipitation in the driest quarter. Furthermore, to explore the relationship between habitat suitability and Liriodendron stress tolerance, we analyzed six physiological indicators of stress tolerance by sampling twelve provenances of L. chinense and five provenances of L. tulipifera. The composite index of six physiological indicators was significantly negatively correlated with the habitat suitability of the species. The stress tolerance of Liriodendron plants in highly suitable areas was lower than that in areas with moderate or low suitability. Overall, these findings improve our understanding of the ecological impacts of climate change, informing future conservation efforts for Liriodendron species.
气候变化对植物的分布，尤其是孑遗物种的分布有着至关重要的影响。因此，预测气候变化对孑遗植物分布的潜在影响对于它们的未来保护至关重要。鹅掌楸属植物是孑遗树种，仅存两个自然物种：北美鹅掌楸和杂交鹅掌楸。然而，未来气候变化对这两个鹅掌楸物种分布的影响程度尚不清楚。因此，我们使用 MaxEnt 模型预测了这两个鹅掌楸物种在当前和未来气候情景下的适宜生境分布。结果表明，两个鹅掌楸物种适宜生境的面积将显著减少。然而，这两个孑遗物种表现出不同的生境转移模式，北美鹅掌楸的适宜生境呈局部收缩，杂交鹅掌楸的适宜生境向北转移，表明环境因素的变化将影响这些物种的分布。在评估的环境因素中，五月降水对北美鹅掌楸的分布影响最大，而最干旱季度的降水对杂交鹅掌楸的分布有显著影响。此外，为了探讨栖息地适宜性与鹅掌楸植物抗逆性之间的关系，我们对 12 个北美鹅掌楸种源和 5 个杂交鹅掌楸种源的 6 种抗逆生理指标进行了采样分析。六个生理指标的综合指数与物种的栖息地适宜性呈显著负相关。高适宜区鹅掌楸植物的抗逆性低于中适宜区和低适宜区。总体而言，这些发现提高了我们对气候变化生态影响的认识，为鹅掌楸物种的未来保护工作提供了信息。
