造林对亚马逊地区土壤细菌生物多样性的影响

IF 2.1 3区 农林科学 Q2 FORESTRY Trees Pub Date : 2025-01-14 DOI:10.1007/s00468-025-02599-w
Tatiana C. D. Pereira, Kaynara F. L. Kavasaki, Kellen B. Carmo, Ingo Isernhagen, Gilcele C. M. Berber, Anderson Ferreira
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引用次数: 0

摘要

森林恢复是用来扭转环境退化的关键办法之一,尽管对于为此目的应采用的最佳模式没有达成一致意见。有研究认为,复植区总体细菌密度和细菌拮抗剂的多样性受到复植模式的调节。为了验证这一假设,我们连续两年比较了10个不同补种林区和原生林土壤样品中的细菌密度,评估了这些地区分离的细菌对尖孢镰刀菌和枯丝核菌的拮抗活性,并通过16S rRNA基因测序鉴定了细菌拮抗活性。除桉树外,再造林模式中使用的所有木材和非木材物种都是亚马逊生物群落的原生物种,并且在三个地区使用了额外的覆盖植物。复植林区间细菌密度无显著差异,但5个样地间细菌密度有显著差异。220株细菌中有20株具有拮抗活性,其中3株属于变形杆菌门,17株属于厚壁菌门,分别属于芽孢杆菌属、短芽孢杆菌属、伯克霍尔德菌属、Paenibacillus属和Variovorax属。在经过自然再造林或通过播撒或机械播种木材和非木材物种的混合种子以及豆科覆盖植物进行再造林的地块的土壤样本中发现了最大的微生物多样性。
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Reforestation impact on soil bacterial biodiversity antagonists of fungal pathogens in Amazon biome

Forest restoration is one of the key approaches employed to reverse environmental degradation, although there is no consensus regarding the best model to be applied for this purpose. It has been hypothesized that overall bacterial density and the diversity of bacterial antagonists in replanted areas are modulated by the reforestation model employed. To test this hypothesis, we have compared the bacterial density in soil samples from ten different replanted forest areas and from a native forest for two consecutive years, evaluated the antagonist activities of bacterial isolates from these areas against Fusarium oxysporum and Rhizoctonia solani, and identified the bacterial antagonists by 16S rRNA gene sequencing. All timber and non-timber species employed in the reforestation models were native to the Amazon biome, with the exception of eucalyptus, and additional cover plants were employed in three of the areas. No significant differences were found in bacterial densities between replanted forest areas in either of the years, but significant between-year differences were detected in five of the plots. Twenty of the 220 bacterial isolates tested showed antagonistic activity and of these three were classified within the phylum Proteobacteria and 17 were classified as Firmicutes and belonged to the genera Bacillus, Brevibacillus, Burkholderia, Paenibacillus and Variovorax. The largest microbial diversities were found in soil samples from plots that had undergone natural reforestation or had been reforested by broadcasting or mechanical sowing of a mixture of seeds from timber and non-timber species along with leguminous cover plants.

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来源期刊
Trees
Trees 农林科学-林学
CiteScore
4.50
自引率
4.30%
发文量
113
审稿时长
3.8 months
期刊介绍: Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
期刊最新文献
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