ABSTRACT Long-term forest monitoring undertaken by Forestcheck since 2001 has examined the effects of silvicultural treatment on floral diversity and assemblage composition in the jarrah forest of southwest Western Australia. Both prescribed burns and wildfires have overlain the network of Forestcheck monitoring sites, providing the opportunity to examine fire and silviculture interactions in natural experiments and allowing experimental control of time-since-fire effects on the flora. We report here two opportunistic experiments. First, the early effects of prescribed burns in spring on the flowering of the vascular flora were compared with closely paired sites that were long unburnt. Second, the early effects of a wildfire in summer on the flowering of the vascular flora were compared between silvicultural treatments. Flowering richness tended to be less on burnt grids in the non-peak period in the first two years after fire in one experiment, but there were no differential effects of silviculture on flowering assemblages arising from interaction with wildfires. Flowering assemblages varied from year to year and the extent to which they varied differed between locations but not as a result of silvicultural treatments. We conclude that no special management with respect to plant flowering is required to remedy outcomes of interaction between wildfire and silvicultural treatments. Further information is needed to understand the long-term implications of variability in flowering assemblages and how it affects the reproductive viability of understorey species and their interactions with pollinator networks in the face of a changing climate.

中文翻译：

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造林和火灾对贾拉林林下开花的影响

摘要 Forestcheck 自 2001 年以来进行的长期森林监测研究了造林处理对西澳大利亚西南部 jarrah 森林中花卉多样性和组合组成的影响。规定的烧伤和野火都覆盖了 Forestcheck 监测站点的网络，提供了在自然实验中检查火灾和造林相互作用的机会，并允许实验控制自火灾以来对植物群的影响。我们在这里报告两个机会主义实验。首先，将春季规定的烧伤对维管植物群开花的早期影响与长期未烧伤的紧密配对位点进行比较。其次，比较了造林处理之间夏季野火对维管植物群开花的早期影响。在一项实验中，在火灾后的前两年非高峰期，在火灾后的非高峰期，开花丰富度往往较低，但造林对与野火相互作用产生的开花组合没有不同的影响。开花组合每年都不同，它们变化的程度因地点而异，但不是造林处理的结果。我们得出结论，不需要对植物开花进行特殊管理来补救野火和造林处理之间相互作用的结果。需要更多信息来了解开花组合变异的长期影响，以及它如何影响下层物种的繁殖能力及其在气候变化时与传粉媒介网络的相互作用。