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<p>Cork oak (<i>Quercus suber</i> L.) is traditionally considered a calcifuge species due to its typical distribution, which rarely includes calcareous soils. This study examines the impact of different rates of active limestone under various water regimes throughout an entire growing season, from seedling emergence until the cessation of growth. Four rates of active limestone (high: 9%, moderate: 6%, low: 3%, and no limestone: control) and three water regimes (severe stress: 25% of field capacity, moderate stress: 50%, and no stress: control) were tested. Seedling emergence was 94.5% and survival was 81% across all treatments, with no significant influence of active limestone. While seedling height was not changed by active limestone, diameter growth was notably reduced, with mean reductions of 7.7%, 12.4%, and 16.3% under low, moderate, and high limestone rates, respectively, compared with the control. Water stress significantly and negatively affected most studied parameters, including seedling survival, height, diameter growth, total biomass, leaf number and area per plant, and seedling quality using the Dickson Quality Index (DQI). Active limestone did not affect resprouting when water conditions were non-limiting, but increased resprouting was observed under moderate water stress at high limestone rates and under severe water stress at low limestone rates. Active limestone reduced leaf thickness only under severe stress and at a high limestone rate, and decreased root length along with biomass growth only under moderate stress. However, water stress did not affect active limestone’s impact on the DQI. This study improves the understanding of cork oak responses to active limestone, in the presence or absence of water stress, aiding the development of effective management practices for cork oak forests.</p>

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Cork oak seedling emergence, survival, and growth in response to active limestone and water stress conditions

  • 期刊论文

  • 发表日期：

    2025年9月27日

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  • Taher Mechergui,
  • Marta Pardos,
  • Douglass F. Jacobs,
  • Arnab Banerjee,
  • Filipe Xavier Catry

摘要

Cork oak (Quercus suber L.) is traditionally considered a calcifuge species due to its typical distribution, which rarely includes calcareous soils. This study examines the impact of different rates of active limestone under various water regimes throughout an entire growing season, from seedling emergence until the cessation of growth. Four rates of active limestone (high: 9%, moderate: 6%, low: 3%, and no limestone: control) and three water regimes (severe stress: 25% of field capacity, moderate stress: 50%, and no stress: control) were tested. Seedling emergence was 94.5% and survival was 81% across all treatments, with no significant influence of active limestone. While seedling height was not changed by active limestone, diameter growth was notably reduced, with mean reductions of 7.7%, 12.4%, and 16.3% under low, moderate, and high limestone rates, respectively, compared with the control. Water stress significantly and negatively affected most studied parameters, including seedling survival, height, diameter growth, total biomass, leaf number and area per plant, and seedling quality using the Dickson Quality Index (DQI). Active limestone did not affect resprouting when water conditions were non-limiting, but increased resprouting was observed under moderate water stress at high limestone rates and under severe water stress at low limestone rates. Active limestone reduced leaf thickness only under severe stress and at a high limestone rate, and decreased root length along with biomass growth only under moderate stress. However, water stress did not affect active limestone’s impact on the DQI. This study improves the understanding of cork oak responses to active limestone, in the presence or absence of water stress, aiding the development of effective management practices for cork oak forests.