Benitez-Malvido Julieta
Instituto de Investigaciones en Ecosistemas y Sustentabilidad, Universidad Nacional Autónoma de México (UNAM), Antigua Carretera a Pátzcuaro No 8701, Col. Ex-Hacienda de San José de la Huerta, Morelia 58090, Mexico.
Plants (Basel). 2023 Jul 25;12(15):2760. doi: 10.3390/plants12152760.
I investigated the size, composition and persistence of the seed-bank in primary forests, secondary forests and old-fields in southern Mexico. I also assessed the contribution of the seed-bank to regeneration relative to other propagule sources. In all habitats, I removed by hand all plants and litter and excluded the seed-rain. For one year, I counted the number of plant species (5-50 cm tall) emerged and grouped them into different growth-forms: trees, shrubs, palms, herbs, woody lianas, epiphytes and hemi-epiphytes. A total of 95 species emerged. The seed-bank size, composition and persistence showed strong variation among successional stages. Emergence was low for primary and secondary forests, but high for old-fields (19, 26, and 68 plants per m, respectively). Herbs were the most abundant in the seed-bank and palms the less. Time had a negative effect on seed-bank size in primary forests and old-fields; whereas for secondary forests size remained constant throughout the year. The number of emerged plants in different growth-forms changed significantly across time for all successional stages. Overall, the seed-bank provided a greater number of plants in old-fields relative to other propagule sources combined. The results showed that forest modification alters the input of propagules throughout the seed-bank for different plant growth-forms.
我研究了墨西哥南部原始森林、次生林和弃耕地中种子库的大小、组成及持久性。我还评估了种子库相对于其他繁殖体来源对更新的贡献。在所有栖息地中，我人工移除了所有植物和凋落物，并排除了种子雨。在一年的时间里，我统计了出土的植物物种数量（株高5 - 50厘米），并将它们分为不同的生长型：乔木、灌木、棕榈、草本、木质藤本、附生植物和半附生植物。总共出土了95个物种。种子库的大小、组成和持久性在演替阶段之间表现出强烈的差异。原始森林和次生林的出土率较低，但弃耕地的出土率较高（分别为每平方米19株、26株和68株）。草本植物在种子库中最为丰富，而棕榈植物最少。时间对原始森林和弃耕地的种子库大小有负面影响；而次生林的种子库大小全年保持不变。在所有演替阶段，不同生长型出土植物的数量随时间发生了显著变化。总体而言，相对于其他繁殖体来源的总和，种子库在弃耕地中提供了更多的植物。结果表明，森林改造改变了不同植物生长型在整个种子库中的繁殖体输入。
