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传统的分析方法低估了森林土壤中钙、镁和钾的植物有效态含量。

Conventional analysis methods underestimate the plant-available pools of calcium, magnesium and potassium in forest soils.

机构信息

INRAE Grand-EST Nancy, UR 1138 Biogéochimie des Ecosystèmes Forestiers, Route d'Amance, 54280, Champenoux, France.

Department of Ecology, Evolution, and Organismal Biology, Iowa State University, 251 Bessey Hall, Ames, IA, 50011, USA.

出版信息

Sci Rep. 2020 Sep 24;10(1):15703. doi: 10.1038/s41598-020-72741-w.

Abstract

The plant-available pools of calcium, magnesium and potassium are assumed to be stored in the soil as exchangeable cations adsorbed on the cation exchange complex. In numerous forest ecosystems, despite very low plant-available pools, elevated forest productivities are sustained. We hypothesize that trees access nutrient sources in the soil that are currently unaccounted by conventional soil analysis methods. We carried out an isotopic dilution assay to quantify the plant-available pools of calcium, magnesium and potassium and trace the soil phases that support these pools in 143 individual soil samples covering 3 climatic zones and 5 different soil types. For 81%, 87% and 90% of the soil samples (respectively for Ca, Mg and K), the plant-available pools measured by isotopic dilution were greater than the conventional exchangeable pool. This additional pool is most likely supported by secondary non-crystalline mineral phases in interaction with soil organic matter and represents in many cases (respectively 43%, 27% and 47% of the soil samples) a substantial amount of plant-available nutrient cations (50% greater than the conventional exchangeable pools) that is likely to play an essential role in the biogeochemical functioning of forest ecosystems, in particular when the resources of Ca, Mg and K are low.

摘要

植物可利用的钙、镁和钾库被认为以交换态阳离子的形式储存在土壤中,吸附在阳离子交换复合体上。在许多森林生态系统中,尽管植物可利用的库非常低,但仍能维持较高的森林生产力。我们假设树木可以从土壤中获取目前常规土壤分析方法无法检测到的养分来源。我们进行了同位素稀释分析,以定量测定钙、镁和钾的植物可利用库,并追踪支持这些库的土壤相,涉及覆盖 3 个气候带和 5 种不同土壤类型的 143 个个体土壤样本。对于 81%、87%和 90%的土壤样本(分别为 Ca、Mg 和 K),同位素稀释法测量的植物可利用库大于常规的可交换库。这种额外的库很可能由与土壤有机质相互作用的次生非晶态矿物相支持,在许多情况下(分别为 43%、27%和 47%的土壤样本),代表了大量的植物可利用养分阳离子(比常规可交换库多 50%),这些阳离子很可能在森林生态系统的生物地球化学功能中发挥重要作用,特别是在 Ca、Mg 和 K 资源匮乏的情况下。

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