Abstract The planting and attempted restoration of tropical forest landscapes is increasing rapidly across the globe. Two limiting aspects of large-scale forest restoration are the demand for appropriate quantities of seeds and seedlings of native species, and the ability to facilitate succession in planted sites. Species functional traits such as seed type, tree size, germination time, and wood density may influence the quantity of seedlings that can be produced for restoration, and the potential of these seedlings to persist and facilitate site succession. Therefore, it is important to understand the species composition and functional trait representation of restoration plantings. We explored the species composition and functional trait representation of 846 restoration plantings in the Australian Wet Tropics containing > 465,000 seedlings from 599 species, using seedling supply records from six nurseries over a six year period (2012–2017). Despite restoration plantings in the Australian Wet Tropics containing an impressive number of species, just 52 species contributed over half of all individual seedlings. We found that species with small animal-dispersed seeds and low wood density were more abundant, on average, and had greater representation in restoration plantings than in mature rainforest. Despite this, we did not find evidence that restoration plantings had a diminished capacity to grow tall or sequester carbon as there was no significant difference in the relative abundance of tall tree species or species with high wood density. Small seeded and fast growing species may be cheaper to produce in nurseries and may accelerate site succession as these characteristics are associated with pioneer and early successional species, however these traits are also associated with higher mortality rates. Understanding how functional trait representation influences the success of restoration plantings will require further insight into temporal aspects of site succession.

中文翻译：

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恢复种植与成熟热带雨林的功能性状表现不同

摘要 热带森林景观的种植和尝试恢复在全球范围内迅速增加。大规模森林恢复的两个限制方面是对适当数量的本地物种种子和幼苗的需求，以及促进种植地点演替的能力。种子类型、树木大小、发芽时间和木材密度等物种功能性状可能会影响可生产用于恢复的幼苗数量，以及这些幼苗的持久性和促进场地演替的潜力。因此，了解恢复种植的物种组成和功能性状表征非常重要。我们探索了澳大利亚湿热带地区 846 个恢复种植的物种组成和功能性状表征，其中包含 > 465，来自 599 个物种的 000 株幼苗，使用六年期间（2012-2017 年）来自六个苗圃的幼苗供应记录。尽管澳大利亚湿热带地区的恢复种植包含大量物种，但只有 52 个物种占所有个体幼苗的一半以上。我们发现，与成熟的雨林相比，具有小动物散播种子和低木材密度的物种平均更丰富，并且在恢复种植中具有更大的代表性。尽管如此，我们没有发现证据表明恢复种植的生长高大或固碳能力下降，因为高大树种或木材密度高的树种的相对丰度没有显着差异。小种子和快速生长的物种在苗圃中生产可能更便宜，并且可能加速现场演替，因为这些特征与先驱和早期演替物种有关，但这些特征也与较高的死亡率有关。了解功能性状表征如何影响修复种植的成功将需要进一步了解场地演替的时间方面。