PDF(Pubmed)
Abstract：
Roots play a fundamental role in forest ecosystems, but obtaining samples from deep layers remains a challenging process due to the methodological and financial efforts required. In our quest to understand the dynamics of Eucalyptus roots, we raise three fundamental questions. First, we inquire about the average extent of the roots of two contrasting Eucalyptus genotypes. Next, we explore the factors that directly influence the growth and depth of these roots, addressing elements such as soil type, climate, and water availability. Lastly, we investigate how the variation in Eucalyptus species may impact root growth patterns, biomass, and carbon stock. In this study, we observed that the maximum root depth increased by an average of 20% when genotypes were grown on sites with higher water availability (wet site). E. urophylla stands had a higher biomass and carbon stock (5.7 Mg C ha-1) of fine roots when cultivated on dry sites (annual rainfall~727 mm) than the wet sites (annual rainfall~1590 mm). In E. grandis × E. camaldulensis stands, no significant differences were observed in the stock of fine root biomass (3.2 Mg C ha-1) between the studied environments. Our results demonstrated that genotypes with greater drought tolerance (E. grandis × E. camaldulensis) tend to maintain higher stocks of fine root biomass (3.2-6.3 Mg ha-1) compared to those classified as plastic (E. urophylla), regardless of the edaphoclimatic conditions of the cultivation site. Finally, our research helps understand how Eucalyptus trees adapt to their environment, aiding sustainable forest management and climate change mitigation. We also provide a practical tool to estimate underground biomass, assisting forest managers and policymakers in ensuring long-term forest sustainability.
摘要：
根系在森林生态系统中起着至关重要的作用,但从深层获得样品仍然是一个具有挑战性的过程，由于需要的方法和财政努力。为了了解桉树根的动态，我们提出了三个基本问题。首先,我们询问了两种不同的桉树基因型的根的平均范围。接下来,我们探索直接影响这些根的生长和深度的因素，寻址元素，如土壤类型，气候,和水的可用性。最后,我们研究了桉树物种的变异如何影响根系生长模式，生物量，和碳储量。在这项研究中,我们观察到，当基因型生长在水分利用率较高的地点（湿润地点）时，最大根深平均增加了20％。在干燥地点（年降雨量〜727mm）种植时，尾叶林的细根生物量和碳储量（5.7MgCha-1）高于湿润地点（年降雨量〜1590mm）。在E.grandis×E.camaldulensis看台，在所研究的环境之间，细根生物量（3.2MgCha-1）的存量没有显着差异。我们的结果表明，基因型具有更高的耐旱性(E。grandis×E.camaldulensis）倾向于保持较高的细根生物量（3.2-6.3Mgha-1），与分类为塑料的那些（E.尾叶)，无论种植地点的气候条件如何。最后,我们的研究有助于了解桉树如何适应环境，协助可持续森林管理和减缓气候变化。我们还提供了一个实用的工具来估算地下生物量，协助森林管理者和决策者确保长期森林可持续性。
