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. 2021 Dec 3;12:795711. doi: 10.3389/fpls.2021.795711

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Copyright © 2021 Mackenzie, Auld, Keith and Ooi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Conceptual models of how the seasonal timing of fire and soil moisture availability affect germination of seven species of Boronia (Rutaceae) from south-eastern Australia. (A) Functional response groups defined by predicted effects of fire seasonality and soil moisture persistence on germination timing and magnitude. Spr, spring; Sum, summer; Aut, autumn; Win, winter; blank spaces – no germination response with 14 weeks. Where longer durations did not increase germination only the color for the shorter duration is presented. (B) Sensitivity to fire seasonality as a function of soil moisture persistence for the response groups identified in (A). (C) Seasonal variation in the availability of soil moisture for germination and the effect of rainfall magnitude. Soil moisture persistence increases with greater precipitation (different curves) and is inversely related to evapotranspiration which increases in warmer months (Supplementary Material 3). (D) Influence of within-season timing of fire and subsequent rainfall on the relative length of the germination window in the season of fire occurrence.