巴西南部阿马帕一个次生林区中芒果相思树的功能策略和丰度对本地物种数量的影响

Elaene Silva, Darley Matos
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摘要

芒果金合欢(Acacia mangium Willd)是一种快速生长的外来树种,当它进入不同的环境时,可能会对次生林造成入侵。本研究旨在分析芒果金合欢的丰度和功能策略以及环境因素对阿马帕州拉兰贾尔杜贾里联邦学院校园后一片次生林片段中本地物种丰富度的影响。为此,对分布在该片区内 10 个 200 平方米小区内胸径(DBH)≥ 10 厘米的所有树木个体进行了鉴定。在地块中采集了土壤样本,并送去进行肥力和粒度分析。测量了地块中出现的芒果树个体的三种叶片功能属性:叶面积(LA)、叶厚(LT)和比叶面积(SLA)。共采集了 145 个树木个体和 14 个树种的样本,其中以 A. mangium Willd 的数量最多,有 95 个个体。芒果树的相对丰度与片段中本地物种的丰富度呈负相关。该物种还根据片区土壤酸度和肥力的变化表现出不同的叶片属性和丰度,这也影响了本地物种的数量。有必要对次生林片段中的外来入侵物种(如芒果杉)进行监测和管理,因为该物种具有入侵性和机会性,会在局部干扰后抑制本地物种的再生。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
EFFECT OF FUNCTIONAL STRATEGIES AND ABUNDANCE OF Acacia mangium Willd ON THE NUMBER OF NATIVE SPECIES IN A SECONDARY FOREST FRAGMENT IN SOUTHERN AMAPA, BRAZIL
Acacia mangium Willd is a fast-growing exotic tree that, when inserted in a different environment, can present an invasive potential in secondary forests. This study aimed to analyze the effect of abundance and functional strategies of A. mangium Willd and edaphic factors on native species richness in a secondary forest fragment located behind the Instituto Federal do Amapá campus Laranjal do Jari, Amapá. For this, all tree individuals with diameter at breast height (DBH) ≥ 10 cm occurring in 10 plots of 200 m2 distributed in the fragment were identified. Soil samples were collected in the plots and sent for fertility and granulometry analysis. Three leaf functional attributes of individuals of A. mangium Willd occurring in the plots were measured: leaf area (LA), leaf thickness (LT) and specific leaf area (SLA). A total of 145 tree individuals and 14 species were sampled, with A. mangium Willd being the most abundant with 95 individuals. The relative abundance of A. mangium Willd was negatively related to native species richness in the fragment. The species also exhibited distinct leaf attributes and abundances according to the variation in soil acidity and fertility in the fragment, which influenced the number of native species. There is a need to develop monitoring and management of invasive exotic species such as A. mangium Willd in fragments of secondary forests, since the species is invasive and opportunistic, and can inhibit the regeneration of native species after local disturbances.
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