ARTIFICIAL DEFOLIATION ON Eucalyptus benthammii AND Eucalyptus dunnii FOR SIMULATION OF LEAF-CUTTING ANT ATTACKS

Q4 Environmental Science

Floresta Pub Date : 2023-07-03 DOI:10.5380/rf.v53i3.81091

M. Nickele, Wilson Reis Filho, S. Penteado, E. C. Queiroz

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Abstract

The effects of different defoliation levels caused by leaf-cutting ants have not yet been evaluated in Eucalyptus benthammii Maiden et Cambage and Eucalyptus dunnii Maiden plants. The aim of this study was to evaluate the losses caused by different defoliation levels on E. benthammii and E. dunnii plants artificially defoliated 30 days after planting, simulating Acromyrmex attacks. Four treatments were evaluated: 0: control, 1: 50%, 2: 75%, and 3, 100% defoliation. Plant height and diameter were recorded at 6, 12, 24, 36 and 72 months after planting. At six months, height and diameter of E. bentammii plants subjected to 100% defoliation differed significantly from control plants, however no significant differences in plant height and diameter were seen after 12 months. In E. dunnii , 100% defoliation resulted in significant plant mortality, and plants that survive this level of defoliation had significant losses in their development. In case of Acromyrmex attack on eucalyptus plants at 30 days after planting, it is suggested to replant E. dunnii 100% defoliated to avoid losses in the end of the forest cycle. In E. benthammii plantations, it is suggested to evaluate the vigor of the 100% defoliated seedlings, as they can recover over time. Only 100% defoliation can lead to losses in Eucalyptus plant growth. However, regionalized studies are necessary to assess the losses that intense defoliation can cause in each situation and in each plant species, as some species, such as E. benthammii, can recover along time.

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利用人工落叶模拟大叶蚁的攻击

不同程度的切叶蚁对底栖桉树和敦栖桉树落叶的影响尚未得到评价。本研究的目的是评估不同落叶程度对种植后30 d人工落叶对滨草和dunnii植物造成的损失，模拟Acromyrmex攻击。评估4种处理:0:对照，1:50 %，2:75 %和3,100 %的落叶。分别于种植后6、12、24、36和72个月记录株高和株径。在6个月时，100%落叶处理的赤竹植株的株高和株径与对照有显著差异，但12个月后，赤竹植株的株高和株径无显著差异。在dunnii中，100%的落叶导致了显著的植物死亡率，在这种落叶水平下存活的植物在发育过程中有显著的损失。如果在种植后30天，桉树被杉螨侵袭，建议补种100%落叶的dunnii，以避免森林循环结束时的损失。在滨草人工林中，建议评价100%落叶幼苗的活力，因为它们可以随着时间的推移而恢复。只有100%的落叶才能导致桉树植物生长的损失。然而，有必要进行区域研究，以评估在每种情况下和每种植物物种中剧烈落叶可能造成的损失，因为一些物种，如benthammii，可以随着时间的推移而恢复。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Floresta Environmental Science-Nature and Landscape Conservation

CiteScore

0.80

自引率

0.00%

发文量

期刊介绍： Revista Floresta admits articles of scientific contribution in Forest Science, in the areas of Nature Conservation, Economy and Forest Policy, Forest Management, Silviculture and Wood Technology. The main task is to promote and divulgate the development of Forest Science in Brazil and in the world. Articles published in Revista Floresta are under total responsibility of the authors, who are aware that they are original studies. It remains implicit that articles were not submitted for publication to any other divulgation media. It remains explicit the agreement of authors to norms of the journal and, along the development of their work, the observance of ethic aspects and respect of the current copyright legislation.