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首页> 外文期刊>Forest Ecology and Management >Effects of history of use on secondary forest regeneration in the Upper Parana Atlantic Forest (Misiones, Argentina)
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Effects of history of use on secondary forest regeneration in the Upper Parana Atlantic Forest (Misiones, Argentina)

机译：使用历史对上巴拉那大西洋森林中次生森林更新的影响（阿根廷米西奥内斯）

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The Upper Parana Atlantic Forest, as with other areas, has been modified due to anthropogenic activities, generating a mosaic of agricultural fields and forests of varying ages and levels of conservation. The objective of this study was to identify structural and floristic patterns in secondary forests generated in abandoned fields with varying historic uses. Changes in vegetation were surveyed using chronosequences from 2 to 70 years. Stands with different land use histories in three areas of northern Misiones, Argentina, were considered. Adults (DBH>=10cm), saplings (3>=DBH<10cm), seedlings (DBH<3cm and height>=50cm) and non-arboreous vegetation (herbaceous plants and shrubs) were surveyed. Data was analyzed using multivariate techniques (TWINSPAN, Detrended Correspondence Analysis, Cluster Analysis, and Kruskal-Wallis test). In the floristic analysis, two main forest groups were identified: one made up of primary forest and oldest secondary forest (>20 years), and another of the youngest secondary forests (<20 years). Basal area and density of individuals (seedlings, saplings, and adults) rapidly increased during the first two decades, and subsequently the adult category reached values comparable to those of mature forests (32m super(2)/ha and 850individuals/ha). During the early years of succession, the forests showed floristic and structural differences related to history of use previous to abandonment; abandoned annual crops showed the greatest densities of saplings and seedlings, while abandoned pastures presented only individuals in the seedling category, and at very low densities. In stands analyzed since the beginning of succession, species of several ecological groups were present (pioneer, initial secondary, late secondary), while climax species appeared only in the seedling category, and in abandoned pastures no species of the later groups were recorded. Our results suggest that differences recorded during the early years of regeneration in sites with varying historic uses may be generated mainly by remnant vegetation at the time of abandonment of the fields (grasses and remnant monoculture plants). After 20 years of succession, it was no longer possible to differentiate the forests structurally or floristically, regardless of age or historic use of each stand. Due to their rapid regeneration capacity, the forests studied play an important role from the start of the successional process in heterogeneous anthropogenic landscapes such as that of Misiones, and contribute to maintaining biodiversity while providing numerous environmental services.
机译：由于人为活动，帕拉纳上大西洋森林以及其他地区已被修改，形成了不同年龄和保护水平的农田和森林的镶嵌图。这项研究的目的是确定具有不同历史用途的废弃林中产生的次生森林的结构和植物区系。使用2至70年的时间序列对植被变化进行了调查。考虑了阿根廷米西奥涅斯北部三个地区具有不同土地利用历史的林分。调查了成虫（DBH> = 10cm），幼树（3> = DBH <10cm），幼苗（DBH <3cm和高度> = 50cm）和非乔木类植物（草本植物和灌木）。使用多元技术（TWINSPAN，去趋势对应分析，聚类分析和Kruskal-Wallis检验）分析数据。在植物区系分析中，确定了两个主要的森林类别：一个由原始森林和最古老的次生森林组成（> 20年），另一个由最年轻的次生森林（<20年）组成。在最初的二十年中，基础面积和个体（幼树，幼树和成年树）的密度迅速增加，随后成年树种的值达到了与成熟森林相当的值（32m super（2）/ ha和850个人/ ha）。在演替的最初几年，森林表现出与废弃之前的使用历史有关的植物和结构差异。废弃的一年生作物显示出最大的树苗和幼苗密度，而废弃的牧场仅表现出幼苗类别中的个体，并且密度很低。在从演替开始以来分析的林分中，存在几个生态组的物种（先驱，初生，后继），而高潮物种仅出现在幼苗类别中，而在废弃的牧场中没有记录到后一组的物种。我们的结果表明，在具有不同历史用途的地点的再生初期，记录的差异可能主要是由于废弃田地（草和残留的单作植物）时的残留植被而产生的。继承20年后，无论年龄大小或每个林分的历史用途如何，都不再可能在结构上或植物上区分森林。由于它们具有快速的再生能力，因此从演替过程开始就在诸如米西奥内斯（Misiones）之类的异质人为景观中起着重要作用，并在维护生物多样性的同时提供了许多环境服务。

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