Relationship between foliar nutrient concentrations and growth of hybrid larch (Larix × eurolepsis Henry)
Relationship between foliar nutrient concentrations and growth of hybrid larch (Larix × eurolepsis Henry)
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杂交落叶松（Larix × eurolepsis Henry）叶面养分浓度与生长的关系
DOI：
10.1016/0378-1127(94)90108-2
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发表时间：
1994
影响因子：
3.7
通讯作者：
L. Pâques
中科院分区：
文献类型：
--
作者：
L. Pâques
对 15 个地点和 30 个样地的杂交落叶松叶子中的 N、P、K、Ca 和 Mg 浓度进行了测定。测量总高度和胸围以估计部位指数。方差分析揭示了站点之间、站点内样地之间以及样地内的活力性状和站点指数（小于 4 至大于 15 m3ha−1year−1）的高度变异性。此外，不同地点叶面主要元素浓度差异很大：1.49–3.11% N、1.1–4.5 g kg−1P、5.2–9.5 g kg−1K、1.9–9.8 g kg−1Ca 和 0.4–2.5 g kg−1Mg。 N/P、N/Mg、K/Ca的比例分别为4.8~21.2、0.4~47.2、0.6~4.3。就立地指数水平而言，杂交落叶松的最佳浓度为：1.95~2.73% N、1.4~2.4 g kg−1P、5.2~8.6 g kg−1K、 3.3–6.2 g kg−1Ca 和 1.1–2.0 g kg−1Mg，N/P 比率为 9.9–14.4，N/Mg 比率为 13.7–17.7，K/Ca 比率为 1.0–1.6。在土壤酸度被归类为中酸性至中性的地块中观察到了这种情况。除了氮之外，在这项研究中，杂交落叶松似乎没有比其他主要针叶树（如挪威云杉或花旗松）有更高的养分需求。然而，它是对肥料最具反应性的物种之一。
Concentrations of N, P, K, Ca and Mg were determined in foliage from hybrid larch from 15 sites and 30 plots in total. Total height and girth at breast height were measured in order to estimate site index. Analysis of variance revealed a high variability both between sites, between plots within sites and within plots for vigour traits and site index (less than 4 to more than 15 m3ha−1year−1). In addition, foliar concentrations of major elements were highly variable between sites: 1.49–3.11% N, 1.1–4.5 g kg−1P, 5.2–9.5 g kg−1K, 1.9–9.8 g kg−1Ca and 0.4–2.5 g kg−1Mg. Ratios of N/P, N/Mg and K/Ca varied from 4.8 to 21.2, 0.4 to 47.2 and 0.6 to 4.3, respectively.With respect to the level of site index, the following values could be considered as optimal concentrations for hybrid larch: 1.95–2.73% N, 1.4–2.4 g kg−1P, 5.2–8.6 g kg−1K, 3.3–6.2 g kg−1Ca and 1.1–2.0 g kg−1Mg, with ratios of 9.9–14.4 for N/P, 13.7–17.7 for N/Mg and 1.0–1.6 for K/Ca. Such conditions were observed in plots where soil acidity was classified as moderately acidic to neutral.Except for nitrogen, hybrid larch did not appear in this study to have higher nutrient requirements than other major conifers such as Norway spruce or Douglas fir. However, it is one of the most reactive species to fertilisers.