Department of Ecology, Swedish University of Agricultural Sciences, PO Box 7044, SE-750 07 Uppsala, Sweden.
Department of Crop Production Ecology, Swedish University of Agricultural Sciences, PO Box 7043, SE-750 07 Uppsala, Sweden.
New Phytol. 2012 Jun;194(4):944-952. doi: 10.1111/j.1469-8137.2012.04114.x. Epub 2012 Apr 4.
All plant species require at least 16 elements for their growth and survival but the relative requirements and the variability at different organizational scales is not well understood. We use a fertiliser experiment with six willow (Salix spp.) genotypes to evaluate a methodology based on Euclidian distances for stoichiometric analysis of the variability in leaf nutrient relations of twelve of those (C, N, P, K, Ca, Mg, Mn, S, Fe, Zn, B, Cu) plus Na and Al. Differences in availability of the elements in the environment was the major driver of variation. Variability between leaves within a plant or between individuals of the same genotype growing in close proximity was as large as variability between genotypes. Elements could be grouped by influence on growth: N, P, S and Mn concentrations follow each other and increase with growth rate; K, Ca and Mg uptake follow the increase in biomass; but uptake of Fe, B, Zn and Al seems to be limited. The position of Cu lies between the first two groups. Only for Na is there a difference in element concentrations between genotypes. The three groups of elements can be associated with different biochemical functions.
所有植物物种的生长和存活都至少需要 16 种元素，但相对需求以及不同组织尺度上的可变性还不太清楚。我们使用肥料实验对六种柳树（Salix spp.）基因型进行了评估，该实验基于欧几里得距离，对其中 12 种（C、N、P、K、Ca、Mg、Mn、S、Fe、Zn、B、Cu）加上 Na 和 Al 的叶养分关系的变异性进行了化学计量分析。环境中元素的可利用性差异是造成变异的主要驱动因素。同一植株内叶片之间或同一基因型的个体在近距离生长时的变异与基因型之间的变异一样大。元素可以按对生长的影响进行分组：N、P、S 和 Mn 浓度依次增加，与生长速率呈正相关；K、Ca 和 Mg 的吸收随着生物量的增加而增加；但是 Fe、B、Zn 和 Al 的吸收似乎受到限制。Cu 的位置介于前两组之间。只有 Na 元素在基因型之间存在浓度差异。这三组元素可以与不同的生化功能相关联。
