Sources of variability in tissue chemistry in northern hardwood species1
Sources of variability in tissue chemistry in northern hardwood species1
复制标题
北方阔叶树种组织化学变异的来源1
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
R. Briggs
中科院分区：
文献类型：
--
作者：
Yang Yang;R. Yanai;F. Fatemi;C. R. Levine;P. Lilly;R. Briggs
树木组织化学的测量受到实验室分析的精确度和准确度、树内取样位置、同种重复树木之间的变化以及每年变化的影响。我们的特点是这些来源的不确定性为六个北方硬木品种，并将它们与观察到的长期变化率。与实验室质量控制相关的不确定性很小（1%-5%），并且元素之间存在差异，K浓度的准确度和精密度最低。树内取样位置对树枝（变异系数为23%）和木材（37%）比树叶或树皮（两者均为12%）更重要（p < 0.001）。叶片中的N和P浓度比其他元素或组织类型从树到树（p = 0.02），从一年到一年（p = 0.03），这意味着更多的样本将需要检测在空间或时间上的差异钙，镁，钾在树枝或木材。浓度的Foli…
Measurements of tree tissue chemistry are influenced by the precision and accuracy of laboratory analyses, sampling position within the tree, variation among replicate trees of the same species, and variation from year to year. We characterized these sources of uncertainty for six northern hardwood species and compared them with observed rates of long-term change. Uncertainty associated with laboratory quality control was small (1%–5%) and differed among elements, with K concentrations exhibiting the lowest accuracy and precision. Sampling position within the tree was more important for branches (the coefficient of variation was 23%) and wood (37%) than for foliage or bark (12% for both) (p < 0.001). Foliar N and P concentrations in leaves were less variable than other elements or tissue types both from tree to tree (p = 0.02) and from year to year (p = 0.03), which means that more samples would be needed to detect differences over space or time for Ca, Mg, or K in branches or wood. Concentrations of foli...