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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Establishment of oak seedlings in historically disturbed sites: Regeneration success as a function of stand structure and soil characteristics
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Establishment of oak seedlings in historically disturbed sites: Regeneration success as a function of stand structure and soil characteristics

机译：在历史扰乱地点建立橡木苗：再生成功作为实体结构和土壤特征的函数

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The establishment and development of oak (Quercus spp.) seedlings are frequently impaired by site heterogeneity resulting from historical anthropogenic disturbances in Mediterranean basin woodlands. In particular, the alteration of forest structure and soil biotic and abiotic components can compromise the natural regeneration of Persian oak (Quercus brantii Lindl.) in western Iran. This study aimed to investigate how soil properties, soil mesofauna diversity and stand structural indices differ between well and poorly regenerated areas. We sampled 105 plots in an oak woodland subjected to past disturbances but protected from human activities for the last 20 years. These 100-m(2) plots were distributed into two groups: i) poorly regenerated plots (PRP) with only 0 or 1 newly established oak seedling, and ii) well regenerated plots (WRP) with = 3 seedlings. In each plot, we characterized the forest structure using three structural indices, and determined the soil properties and mesofauna diversity. Structural indices were higher in WRP than in PRP for height (0.83 and 0.23), diameter differentiation (0.74 and 0.36) and species mixture (0.90 and 0.21). Also, richness and diversity of soil mesofauna were lower in PRP than in WRP.A canonical correspondence analysis (CCA) ordination clearly separated WRP, which were characterized by a clumped spatial distribution of mature oak trees on fertile soils, from PRP that exhibited a uniform spatial distribution of trees established on soils with a higher sand content (63 and 59%) and a higher bulk density (1.7 and 1.3).The uniform spatial distribution of trees, which was less favourable to oak seedling establishment, was inherited from intensive past human disturbances. To favour oak regeneration, we recommend applying management actions in cooperation with land-users, in particular the conservation of small patches of tree clumps to act as islands of fertility and seed sources. (C) 2017 Elsevier B.V. All rights reserved.
机译：橡木（栎属SPP。）幼苗的建立和发展经常受到地中海盆地林地历史人类紊乱引起的幼苗造成的。特别是，森林结构和土壤生物和非生物组分的改变可以损害波斯橡木（栎属Brantii Lindl的天然再生。本研究旨在调查土壤性质，土壤中，土壤中，土壤中，土壤中苏丹多样性和立场结构索引在井和较差的地区之间不同。我们在橡木林地中取样了105个地块，经过过去的骚乱，但在过去的20年里免受人类活动的影响。将这些100μm（2）个图分为两组：i）再生地区（PRP），仅具有0或1个新建立的橡木苗，II）良好的再生地块（WRP）与＆ = 3个幼苗。在每种剧情中，我们用三种结构指数表征了森林结构，并确定了土壤性质和中部的多样性。 WRP中的结构索引高于高度（0.83和0.23），直径分化（0.74和0.36）和物种混合物（0.90和0.21）。此外，PRP的土壤中部的丰富性和多样性低于WRP.A Canonical对应分析（CCA）秩序明显分离的WRP，其特征在于肥沃的土壤中成熟橡树的丛生空间分布，从出现均匀的PRP。在含沙含量（63和59％）和更高的堆积密度（1.7和1.3）的土壤中建立的树木的空间分布。树木的均匀空间分布，对橡木苗木建立不太有利，从密集的过去继承人类的骚乱。为了支持橡树再生，建议将管理行动与土地用户合作，特别是保护植物小块的守恒，以充当生育和种子来源的岛屿。 （c）2017 Elsevier B.v.保留所有权利。

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