Taiwania

The invasion of alien species Miconia crenata (Vahl) Michelang in disturbed/undisturbed lowland mixed dipterocarp and Kerangas forests in Sabah, Malaysia Understanding the factors that make a site susceptible to invasion is essential to mitigate the impacts of invasive alien plant species (IAPS) on biodiversity. Miconia crenata is one of the few IAPS that can colonize undisturbed tropical rainforests. In this study, we investigate the abundance of Miconia crenata in disturbed and undisturbed lowland mixed dipterocarp forest and Kerangas forests in Sabah, Malaysia. Three 400 m long transects were established within each of the four sites. The transects ran from the forest edge into the interior, and eight 25 m2 plots were established at fixed distances along each transect. A further twenty 100 m2 plots were established in each of the undisturbed sites of Kabili-Sepilok Forest Reserve. We found that the density of Miconia crenata was significantly lower along the transects in the Kerangas forest, compared to mixed dipterocarp forest. Miconia crenata densities were also significantly lower along transects in the undisturbed forest compared to the disturbed forest. Within the undisturbed sites, Miconia crenata was 13 times more abundant in the mixed dipterocarp forest compared to the Kerangas forest. This difference in Miconia crenata abundance between the two forest types is probably due to soil fertility, with fertile sites more susceptible to invasion by Miconia crenata.

本研究聚焦于马来西亚沙巴地区受干扰与未受干扰的低地混合桢楠与克朗森林中入侵物种米康尼亚克伦塔（Miconia crenata (Vahl) Michelang）的侵袭现象。探究影响特定区域易受入侵物种侵袭的因素对于减轻入侵外来植物物种（IAPS）对生物多样性的负面影响至关重要。米康尼亚克伦塔是极少数能够侵入未受干扰的热带雨林的入侵外来植物物种之一。在本研究中，我们调查了米康尼亚克伦塔在沙巴地区受干扰与未受干扰的低地混合桢楠森林和克朗森林中的丰度。在每个研究地点内，我们设立了三条400米长的样带，样带从森林边缘延伸至内部，并在每条样带固定距离处设立了八块25平方米的样地。在未受干扰的卡比里-塞皮洛克森林保护区，我们还在每个地点设立了二十块100平方米的样地。研究发现，相较于混合桢楠森林，米康尼亚克伦塔在克朗森林样带中的密度显著较低。在未受干扰的森林中，米康尼亚克伦塔的密度相较于受干扰的森林也显著较低。在未受干扰的区域中，米康尼亚克伦塔在混合桢楠森林中的丰度是克朗森林的13倍。这种两种森林类型中米康尼亚克伦塔丰度的差异，可能是由于土壤肥力差异所致，肥沃的地点更易受到米康尼亚克伦塔的侵袭。