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Variation in morphological and chemical traits of Mediterranean tree roots: linkage with leaf traits and soil conditions
Plant and Soil ( IF 4.9 ) Pub Date : 2020-03-26 , DOI: 10.1007/s11104-020-04485-5
Teodoro Marañón , Carmen M. Navarro-Fernández , Marta Gil-Martínez , María T. Domínguez , Paula Madejón , Rafael Villar

Aims Root functions are multiple and essential for the growth and survival of terrestrial plants. The aim of this work was to analyse the main trends in the variation of root traits, their coordination with leaf traits and their relationships with soil conditions. Methods We measured the variation of 27 fine root traits (five morphological, 20 chemical and two isotopic signatures) in trees of seven species of a mixed plantation in a metal-contaminated and remediated site of Southern Spain. Results We found evidences supporting the existence of a root economics spectrum (RES). However, other dimensions were identified as being independent of the main RES: mainly the variation in the carbon concentration, the accumulation of trace elements associated with tolerance of metal-rich soils, and the fractionation of δ 15 N as a time-integrated trait of mycorrhizal-mediated nutrition. In general, roots and leaves were functionally coordinated, although most of the trace elements showed strong root-leaf discordance. The soil conditions interacted with the fine root traits in feedback processes. The ability of tree roots to accumulate trace elements and to reduce their translocation to leaves is a desirable trait for the phytoremediation of metal-contaminated soils. Conclusions Roots are multifunctional. Understanding the variations in the root traits of trees will help us to predict both the responses of forests to global changes, including soil contamination, and the provision of soil-based ecosystem services.

中文翻译:

地中海树根形态和化学性状的变化:与叶性状和土壤条件的联系

目的 根功能对陆生植物的生长和生存具有多重性和必要性。这项工作的目的是分析根性状变异的主要趋势,它们与叶性状的协调以及它们与土壤条件的关系。方法 我们测量了西班牙南部一个金属污染和修复地点的混合种植园 7 种树木中 27 种细根特征(五种形态学、20 种化学特征和两种同位素特征)的变化。结果 我们发现了支持根经济学谱 (RES) 存在的证据。然而,其他维度被确定为与主要 RES 无关:主要是碳浓度的变化、与富金属土壤耐受性相关的微量元素的积累、δ 15 N 的分离作为菌根介导的营养的时间整合性状。总的来说,根和叶在功能上是协调的,尽管大多数微量元素表现出强烈的根叶不协调。土壤条件在反馈过程中与细根性状相互作用。树根积累微量元素并减少它们向叶子的易位的能力是金属污染土壤植物修复的理想特性。结论 根是多功能的。了解树木根系特征的变化将有助于我们预测森林对全球变化(包括土壤污染)的反应以及提供以土壤为基础的生态系统服务。尽管大多数微量元素表现出强烈的根叶不一致性。土壤条件在反馈过程中与细根性状相互作用。树根积累微量元素并减少它们向叶子的易位的能力是金属污染土壤植物修复的理想特性。结论 根是多功能的。了解树木根系特征的变化将有助于我们预测森林对全球变化(包括土壤污染)的反应以及提供以土壤为基础的生态系统服务。尽管大多数微量元素表现出强烈的根叶不一致性。土壤条件在反馈过程中与细根性状相互作用。树根积累微量元素并减少它们向叶子的易位的能力是金属污染土壤植物修复的理想特性。结论 根是多功能的。了解树木根系特征的变化将有助于我们预测森林对全球变化(包括土壤污染)的反应以及提供以土壤为基础的生态系统服务。树根积累微量元素并减少它们向叶子的易位的能力是金属污染土壤植物修复的理想特性。结论 根是多功能的。了解树木根系特征的变化将有助于我们预测森林对全球变化(包括土壤污染)的反应以及提供以土壤为基础的生态系统服务。树根积累微量元素并减少它们向叶子的易位的能力是金属污染土壤植物修复的理想特性。结论 根是多功能的。了解树木根系特征的变化将有助于我们预测森林对全球变化(包括土壤污染)的反应以及提供以土壤为基础的生态系统服务。
更新日期:2020-03-26
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