Preparation burning may not improve short-term seed survival in an Amazonian savanna

Experimental Results Pub Date : 2021-03-01 DOI:10.1017/exp.2021.2

V. J. U. Rodriguez Chuma, D. Norris, T. P. da Silva, J. A. da Silva, K. Cavalcante, Igor A. P. Sidônio, A. F. de Souza, D. S. S. Valentim, S. Mochiutti, F. Michalski

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Abstract

Abstract The role of fire in the management of degraded areas remains strongly debated. Here we experimentally compare removal and infestation of popcorn kernels (Zea mays L. – Poaceae) and açaí fruits (Euterpe oleracea Mart. – Arecaceae) in one burned and two unburned savanna habitats in the eastern Brazilian Amazon. In each habitat, a total of ten experimental units (five per seed type) were installed, each with three treatments: (1) open access, (2) vertebrate access, and (3) invertebrate access. Generalized linear models showed significant differences in both seed removal (P < 0.0001) and infestation (P < 0.0001) among seed type, habitats and access treatments. Burned savanna had the highest overall seed infestation rate (24.3%) and invertebrate access increased açaí seed infestation levels to 100% in the burned savanna. Increased levels of invertebrate seed infestation in burned savanna suggest that preparation burning may be of limited use for the management and restoration of such habitats in tropical regions.

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在亚马逊热带稀树草原上，准备燃烧可能不会提高种子的短期存活率

火灾在退化地区管理中的作用仍然存在激烈的争论。本文通过实验比较了玉米粒(Zea mays L. - Poaceae)和açaí果实(Euterpe oleracea Mart)的去除和侵染效果。-槟榔科)在巴西亚马逊东部一个被烧毁和两个未被烧毁的稀树草原栖息地。每个生境共设置了10个实验单元(每种种子类型5个)，每个实验单元有三种处理:(1)开放通道，(2)脊椎动物通道，(3)无脊椎动物通道。广义线性模型显示，不同种子类型、不同生境和不同通路处理在种子去除率(P < 0.0001)和侵染率(P < 0.0001)上存在显著差异。在被烧毁的热带稀树草原上，种子侵染率最高(24.3%)，无脊椎动物的进入使种子侵染率açaí增加到100%。被烧毁的热带稀树草原无脊椎动物种子侵扰程度的增加表明，准备燃烧对热带地区这类栖息地的管理和恢复可能作用有限。

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Experimental Results

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