Seed traits determine species responses to fire under varying soil heating scenarios

1) Many plant species in fire-prone environments maintain persistence through fire via soil seedbanks. However, seeds stored within the soil are at risk of mortality from elevated soil temperatures during fire. Seeds may be protected from fire-temperature impacts by burial, however those buried too deeply may germinate but fail to emerge. Thus, successful post-fire seed regeneration is contingent upon a trade-off between burial depth and survival through fire.

2) We examined the relationships between seedling emergence behaviour, seed survival, and soil temperatures during fire in 13 native and four non-native woodland species in southwestern Australia. We assessed total seedling emergence per depth, maximum seedling emergence depth and seedling emergence speed from seeds planted at seven depths (0, 1, 2, 3, 4, 5, 7 10 cm). Soil temperatures were quantified using distributed temperature sensing in optic fibre (DTS), measured continuously between 1 and 10 cm in depth (temperatures wer...

1) 许多生长在易火环境中的植物物种通过土壤种子库维持其在火灾后的存续。然而，土壤中储存的种子在火灾期间面临土壤温度升高导致的死亡风险。种子可通过埋藏免受火灾温度的影响，但埋藏过深的种子可能萌发却无法出土。因此，火后种子的成功再生取决于埋藏深度与火灾存活之间的权衡。

2) 我们研究了澳大利亚西南部13种本地林地物种和4种非本地林地物种的幼苗出土行为、种子存活率与火灾期间土壤温度之间的关系。我们评估了种植在7个深度（0、1、2、3、4、5、7、10厘米）的种子在各深度的总幼苗出土量、最大幼苗出土深度及幼苗出土速度。土壤温度通过光纤分布式温度传感（DTS）进行量化，在1至10厘米深度范围内持续测量（温度数据...