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首页> 外文期刊>Plant and Soil >An assessment of soil enrichment by actinorhizal N2 fixation using δ15N values in a chronosequence of deglaciation at Glacier Bay, Alaska
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An assessment of soil enrichment by actinorhizal N2 fixation using δ15N values in a chronosequence of deglaciation at Glacier Bay, Alaska

机译：利用δ15 N值在阿拉斯加冰川湾冰消时序中通过放线in固N2 固色法评估土壤富集

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摘要

The extent of transfer of fixed N between N2-fixing and non-N2-fixing plant species is largely unknown in successional studies. In order to redress this deficiency at a locale intensively studied ecologically, leaf tissue samples were collected from actinorhizal N2-fixing (Alnus, Shepherdia, and Dryas) and two non-N2-fixing (Salix) woody species within research plots located along a chronosequence of deglaciated fjord in Glacier Bay National Park, Alaska. The tissue samples were analyzed for δ15N content, and the resulting data analyzed for trends in plant tissue N. Among the non-N2-fixing Salix species, δ15N values increased from the most recently deglaciated sites to converge with the temporally more-stable values for the symbiotic N2-fixing species on sites at about 40 years after deglaciation. The lower δ15N values of sequestered N in plant tissues suggested that N derived from N2-fixing plants accounts for the major portion of N in associated plants up to 40 years after deglaciation. The 15N isotopic data also suggested that Shepherdia canadensis depends least on soil N, D. drummondii the most, and A. viridis ssp. sinuata somewhere between those two species. The presence of a sere dominated by dense thickets of A. viridis ssp. sinuata at the convergence of δ15N values for the N2-fixing and non-N2-fixing species indicated that this species is most responsible for accumulation of fixed N in soil at Glacier Bay. This paper is dedicated to the memory of Steven J. Kohls who died prior to publication of this research.
机译：在连续研究中，固定氮在固定N2的植物物种和非固定N2的植物之间的转移程度是未知的。为了纠正在生态学上深入研究的一个地方的这种缺陷，从放线act固氮（Alnus，Shepherdia和Dryas）和两种非固氮（Salix）木本中收集了叶片组织样本。位于阿拉斯加冰川湾国家公园冰川峡湾时序排列的研究区内的物种。分析组织样品中的δ15 N含量，并分析所得数据以分析植物组织N的趋势。在非固定N2 的柳属物种中，δ15 N值比在冰消融化后约40年，最近的冰期站点与共生N2 固定物种的时间上更稳定的值收敛。植物组织中固存氮的较低的δ15 N值表明，脱冰后长达40年，来自固氮植物的N占伴生植物N的主要部分。 15 N同位素数据也表明加拿大牧羊犬对土壤N，D。drummondii和A. viridis ssp的依赖最少。在这两个物种之间的某个地方。隐孢子虫ssp的浓密灌木丛占主导的sere的存在。固氮种和非固氮种的δ15N值收敛时的sinuata表明，该种是冰川湾土壤中固氮积累的最主要原因。本文致力于纪念史蒂芬·J·科尔斯（Steven J. Kohls），他在这项研究发表之前就去世了。

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