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• W2330486412 abstract "兴安落叶松（<em>Larix gmelinii</em>）为我国北方人工林优势树种，采集地理和气候差异明显的6个种源种子，在分布区南界的均一立地条件下进行播种，形成了32a林分。采集新老枝、新老叶和不同径级的根样品，测定其氮（N）和磷（P）浓度，比较种源间差异以及其随月份的变化和各器官NP元素之间的相关性。结果表明：老枝叶（<em>P</em> < 0.05）、1-2 mm根（<em>P</em> < 0.01）和2-5 mm根（<em>P</em> < 0.05）N浓度在种源间差异显著，变化范围分别为21.1-24.2 mg/g、5.9-7.8 mg/g和4.7-6.5 mg/g。P浓度在老枝叶（<em>P</em> < 0.05）和新枝叶（<em>P</em> < 0.05）中都表现出种源间的差异显著，变化范围分别为4.5-5.8 mg/g和4.5-6.5 mg/g。根系和枝叶的N/P皆存在种源间显著性差异（<em>P</em> < 0.05）。叶片和根系的NP浓度的月份变化呈现先减小再增加的趋势，而新枝则呈现增加-减小-增加的不同趋势。新老枝、新老叶和根系的N和P浓度之间显著相关；新老枝、新老叶和根系之间的N浓度显著相关。不同种源兴安落叶松因对不同环境的长期适应而产生NP化学计量特征的遗传差异。;To understand response and adaptation of nitrogen (N) and phosphorus (P) stoichimetry to environmental changes, we conducted a provenance experiment on <em>Larix gmelinii</em>, the dominant boreal tree species in northeastern China. We collected seeds from six provenances with different geographical and climatic conditions and planted the seeds at a homogenous site in the southern boundary of the distribution range of this species for 32 years. Our objectives were to (1) examine variations in the concentrations of N and P in different organs among provenances, (2) explore monthly dynamics in the concentrations, and (3) explore correlations between N and P concentrations in different organs. The results showed that the N concentrations in the needles on old branch, fine roots (diameter 1-2 mm), and medium roots (diameter 2-5 mm) showed significantly different among the provenances (<em>P</em> < 0.05, <em>P</em> < 0.01, and <em>P</em> < 0.05, respectively), with the concentrations ranging from 21.1 to 24.2 mg/g, from 5.9 to 7.8 mg/g, and from 4.7 to 6.5 mg/g, respectively. The P concentrations in the needles on old branch and needles on new twig were significantly different (<em>P</em> < 0.05) among the provenances, with the concentrations ranging from 4.5-5.8 mg/g and from 4.5-6.5 mg/g, respectively. The N/P in the roots, branches and needles showed significantly different among the provenances (<em>P</em> < 0.05). The seasonal variations in the concentrations of N and P in the needles and roots trended to decrease first and then increase as the growing season proceeded, while those in the twigs showed a trend of increasing-decreasing-increasing. There were significant correlations between N and P concentrations in branches, needles, fine roots and medium roots. There were significant correlations between the N concentrations in the needles on twigs and on branches, twigs, branches and roots. The results suggest that the adaptation of <em>Larix gmelinii</em> trees to different environments in the six provenances lead to genetic differentiation in their stoichiometric traits of N and P." @default.
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• W2330486412 date "2014-01-01" @default.
• W2330486412 modified "2023-09-26" @default.
• W2330486412 title "Influence of environmental changes on stoichiometric traits of nitrogen and phosphorus for<i>Larix gmelinii</i>trees" @default.
• W2330486412 doi "https://doi.org/10.5846/stxb201306301805" @default.
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