Enrichment planting is often suggested as a means of enhancing the productivity of logged rainforest. However, little is known about the long-term survival and growth of these trees. In this study, we used historical data from enrichment planting trials ranging from 15 to 32 years old to examine the survival and growth of 16 tree species across different sites in north Queensland, Australia. The results complement and extend current knowledge on the potential role of enrichment planting from a production perspective. A key finding was that the initial level of post-logging overwood did not appear to affect the immediate survival of enrichment plantings, but in the longer term (up to 30 years) survival decreased as post-logging overwood and regrowth increased. This suggests that removal of overwood should take place at the time of enrichment planting. A further key finding was that despite regular tending to remove vegetation adjacent to the plantings, competition from saplings and trees that were situated outside the tended area emerged as a major source of competition in some plots. By implication, the success of enrichment planting may depend on removal of competition from the entire logged area, not just adjacent to enrichment plantings. Results between individual species and trials varied widely. The best development of Flindersia brayleyana resulted in a mean tree diameter of 32.5 cm at age 22 for the 100 tallest trees per hectare. Although Eucalyptus grandis, Eucalyptus microcorys, and Eucalyptus pilularis all failed—as expected, because they do not normally grow in rainforest—Corymbia torelliana, Cardwellia sublimis, Araucaria bidwillii, Khaya senegalensis, Flindersia amboinensis, and Swietenia macrophylla also failed although they grow naturally in similar sites. In other trials, tree height and basal area growth were often poor. For example, Khaya ivorensis grew to a basal area of only 1.3 m²/ha and a mean height of 7.7 m at age 10, and Flindersia ifflaiana only grew to a basal area of 0.7 m²/ha and a height of 7.9 m, also at age 10. Overall, these results emphasise the necessity of site–species matching before enrichment planting begins and the necessity of post-planting monitoring and remedial tending.

中文翻译：

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澳大利亚北昆士兰州采伐的热带雨林中丰富种植的长期生存和生长

人们通常建议通过种植富集来提高砍伐的雨林的生产力。但是，对于这些树木的长期生存和生长知之甚少。在这项研究中，我们使用了15到32岁的浓缩种植试验的历史数据来研究16种树种在澳大利亚昆士兰州北部不同地点的生存和生长。这些结果补充并扩展了从生产角度对浓缩种植的潜在作用的当前知识。一个关键的发现是，伐木后伐木的初始水平似乎并不影响浓缩种植的立即存活，但是从更长的时间（长达30年）来看，随着伐木后伐木和重新生长的增加，存活率下降。这表明在富集种植时应清除积木。另一个重要发现是，尽管经常趋向于移走种植园附近的植被，但在某些田地中，来自抚育区以外的树苗和树木的竞争却成为竞争的主要来源。言下之意，富集种植的成功可能取决于消除整个伐木地区的竞争，而不仅仅是与富集种植相邻。单个物种和试验之间的结果差异很大。最好的发展 富集种植的成功可能取决于消除整个伐木地区的竞争，而不仅仅是与富集种植相邻。各个物种和试验之间的结果差异很大。最好的发展 富集种植的成功可能取决于消除整个伐木地区的竞争，而不仅仅是与富集种植相邻。单个物种和试验之间的结果差异很大。最好的发展Flindersia brayleyana在22岁时每公顷100棵最高的树木平均树径为32.5厘米。虽然巨桉，小帽桉，和桉树pilularis都失败了，正如所料，因为它们通常不会在rainforest-增长Corymbia torelliana，Cardwellia sublimis，大叶南洋杉，非洲楝，巨盘木，和大叶桃花心木也未能虽然他们自然成长中类似的网站。在其他试验中，树高和基础面积增长通常较差。例如，象牙山在10岁时，其生长面积仅为1.3 m ² / ha，平均高度为7.7 m，而在10岁时，Flflasia ifflaiana仅生长至0.7 m ² / ha的基础面积和7.9 m的高度。总体而言，这些结果强调了在富集种植开始之前进行场地－物种匹配的必要性，以及种植后监测和补救措施的必要性。