Dormancy Class: Another Fire Seasonality Effect on Plants

Dechang Cao; Carol C. Baskin; Jerry M. Baskin

doi:10.1016/j.tree.2020.08.004

Dispersal: The Eighth Fire Seasonality Effect on Plants

Trends in Ecology & Evolution ◽

10.1016/j.tree.2019.12.001 ◽

2020 ◽

Vol 35 (4) ◽

pp. 305-307 ◽

Cited By ~ 3

Author(s):

David A. Keith ◽

Bianca Dunker ◽

Don A. Driscoll

Keyword(s):

Fire Seasonality

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Seed Dormancy Interacts with Fire Seasonality Mechanisms

Trends in Ecology & Evolution ◽

10.1016/j.tree.2020.09.008 ◽

2020 ◽

Vol 35 (12) ◽

pp. 1057-1059

Author(s):

Ryan Tangney ◽

Russell G. Miller ◽

Neal J. Enright ◽

Joseph B. Fontaine ◽

David J. Merritt ◽

...

Keyword(s):

Seed Dormancy ◽

Fire Seasonality

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Mechanisms of Fire Seasonality Effects on Plant Populations

Trends in Ecology & Evolution ◽

10.1016/j.tree.2019.07.009 ◽

2019 ◽

Vol 34 (12) ◽

pp. 1104-1117 ◽

Cited By ~ 13

Author(s):

Russell G. Miller ◽

Ryan Tangney ◽

Neal J. Enright ◽

Joseph B. Fontaine ◽

David J. Merritt ◽

...

Keyword(s):

Plant Populations ◽

Fire Seasonality

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Effects of fire seasonality and intensity on resprouting woody plants in prairie‐forest communities

Restoration Ecology ◽

10.1111/rec.13451 ◽

2021 ◽

Author(s):

Jed Meunier ◽

Nathan S. Holoubek ◽

Yari Johnson ◽

Tim Kuhman ◽

Brad Strobel

Keyword(s):

Woody Plants ◽

Forest Communities ◽

Fire Seasonality

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Separating agricultural and non-agricultural fire seasonality at regional scales

Biogeosciences Discussions ◽

10.5194/bgd-9-5551-2012 ◽

2012 ◽

Vol 9 (5) ◽

pp. 5551-5577 ◽

Cited By ~ 1

Author(s):

B. I. Magi ◽

S. Rabin ◽

E. Shevliakova ◽

S. Pacala

Keyword(s):

Land Cover ◽

Agricultural Land ◽

Cultural Practices ◽

Land Uses ◽

Climate Conditions ◽

Fire Seasonality ◽

Agricultural Burning ◽

Regional Basis ◽

Pasture Area ◽

Earth System Models

Abstract. The timing and length of burning seasons in different parts of the world depend on climate, land cover characteristics, and human activities. In this study, global fire data from satellite-based instruments are used in conjunction with global gridded distributions of agricultural land cover types (defined as the sum of cropland and pasture area) to separate the seasonality of agricultural burning practices from that of non-agricultural fire. The results presented in this study show that agricultural and non-agricultural land experience broadly different fire seasonality patterns that are not always linked to climate conditions. We highlight these differences on a regional basis, examining variations in both agricultural land cover and associated cultural practices to help explain our results. While we discuss two land cover categories, the methods can be generalized to derive seasonality for any number of land uses or cover types. This will be useful as global fire models evolve to be fully interactive with land use and land cover change in the next generation of Earth system models.

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Fire Seasonality, Seasonal Temperature Cues, Dormancy Cycling, and Moisture Availability Mediate Post-fire Germination of Species With Physiological Dormancy

Frontiers in Plant Science ◽

10.3389/fpls.2021.795711 ◽

2021 ◽

Vol 12 ◽

Author(s):

Berin D. E. Mackenzie ◽

Tony D. Auld ◽

David A. Keith ◽

Mark K. J. Ooi

Keyword(s):

Seedling Recruitment ◽

Fire Severity ◽

Seedling Emergence ◽

Seasonal Temperature ◽

Soil Heating ◽

Fire Seasonality ◽

Moisture Availability ◽

Wide Range ◽

Physiological Dormancy ◽

In Fire

Fire seasonality (the time of year of fire occurrence) has important implications for a wide range of demographic processes in plants, including seedling recruitment. However, the underlying mechanisms of fire-driven recruitment of species with physiological seed dormancy remain poorly understood, limiting effective fire and conservation management, with insights hampered by common methodological practices and complex dormancy and germination requirements. We sought to identify the mechanisms that regulate germination of physiologically dormant species in nature and assess their sensitivity to changes in fire seasonality. We employed a combination of laboratory-based germination trials and burial-retrieval trials in natural populations of seven species of Boronia (Rutaceae) to characterize seasonal patterns in dormancy and fire-stimulated germination over a 2-year period and synthesized the observed patterns into a conceptual model of fire seasonality effects on germination. The timing and magnitude of seedling emergence was mediated by seasonal dormancy cycling and seasonal temperature cues, and their interactions with fire seasonality, the degree of soil heating expected during a fire, and the duration of imbibition. Primary dormancy was overcome within 4–10 months’ burial and cycled seasonally. Fire-associated heat and smoke stimulated germination once dormancy was alleviated, with both cues required in combination by some species. For some species, germination was restricted to summer temperatures (a strict seasonal requirement), while others germinated over a broader seasonal range of temperatures but exhibited seasonal preferences through greater responses at warmer or cooler temperatures. The impacts of fires in different seasons on germination can vary in strength and direction, even between sympatric congeners, and are strongly influenced by moisture availability (both the timing of post-fire rainfall and the duration soils stay moist enough for germination). Thus, fire seasonality and fire severity (via its effect on soil heating) are expected to significantly influence post-fire emergence patterns in these species and others with physiological dormancy, often leading to “germination interval squeeze.” Integration of these concepts into current fire management frameworks is urgently required to ensure best-practice conservation. This is especially pertinent given major, ongoing shifts in fire seasonality and rainfall patterns across the globe due to climate change and increasing anthropogenic ignitions.

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