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Do oaks have different strategies for uptake of N, K and P depending on soil depth?

机译：橡木根据土壤深度有不同的氮，钾和磷吸收策略吗？

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The uptake of nutrients from deep soil layers has been shown to be important for the long-term nutrient sustainability of forest soils. When modelling nutrient uptake in forest ecosystems, the nutrient uptake capacity of trees is usually defined by the root distribution. However, this leads to the assumption that roots at different soil depths have the same capacity to take up nutrients. To investigate if roots located at different soil depths differ in their nutrient uptake capacity, here defined as the nutrient uptake rate under standardized conditions, a bioassay was performed on excised roots (<1 mm) of eight oak trees (Quercus robur L.). The results showed that the root uptake rate of super(86)Rb super(+) (used as an analogue for K super(+)) declined with increasing soil depth, and the same trend was found for [Equation]. The root uptake rate of [Equation], on the other hand, did not decrease with soil depth. These different physiological responses in relation to soil depth indicate differences in the oak roots, and suggest that fine roots in shallow soil layers may be specialized in taking up nutrients such as K super(+) and [Equation] which have a high availability in these layers, while oak roots in deep soil layers are specialized in taking up other resources, such as P, which may have a high availability in deep soil layers. Regardless of the cause of the difference in uptake trends for the various nutrients, these differences have consequences for the modelling of the soil nutrient pool beneath oak trees and raise the question of whether roots can be treated uniformly, as has previously been done in forest ecosystem models.
机译：事实表明，从深层土壤中吸收养分对于森林土壤的长期养分可持续性很重要。在对森林生态系统中的养分吸收进行建模时，树木的养分吸收能力通常由根系分布定义。但是，这导致了这样一个假设，即不同土壤深度的根具有吸收养分的相同能力。为了研究位于不同土壤深度的根的养分吸收能力（此处定义为标准化条件下的养分吸收率）是否不同，对八棵橡树（Quercus robur L.）的切除根（<1 mm）进行了生物测定。结果表明，super（86）Rb super（+）（用作K super（+）的类似物）的根系吸收率随土壤深度的增加而降低，[等式]也发现了相同的趋势。另一方面，[方程]的根吸收率并未随土壤深度而降低。这些与土壤深度有关的不同生理响应表明了橡树根部的差异，这表明浅层土壤中的细根可能专门吸收诸如K super（+）和[Equation]等在这些土壤中具有较高利用率的养分。深层土壤中的橡树根专门用于吸收其他资源，例如P，在深层土壤中可能具有较高的利用率。不管各种养分吸收趋势差异的原因如何，这些差异都会对橡树下土壤养分池的建模产生影响，并提出了是否可以像以前在森林生态系统中一样对根进行统一处理的问题。楷模。

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