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首页> 外文期刊>Plant and Soil >Alder and lupine enhance nitrogen cycling in a degraded forest soil in Northern Sweden
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Alder and lupine enhance nitrogen cycling in a degraded forest soil in Northern Sweden

机译：Sweden木和羽扇豆增强瑞典北部退化森林土壤中的氮循环

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摘要

Positive effects of legumes and actinorhizal plants on N-poor soils have been observed in many studies but few have been done at high latitudes, which was the location of our study. We measured N2 fixation and several indices of soil N at a site near the Arctic Circle in northern Sweden. More than 20 years ago lupine (Lupinus nootkatensis Donn) and gray alder (Alnus incana L. Moench) were planted on this degraded forest site. We measured total soil N, net N mineralization and nitrification with a buried bag technique, and fluxes of NH+ 4 and NO− 3 as collected on ion exchange membranes. We also estimated N2 fixation activity of the N2-fixing plants by the natural abundance of 15N of leaves with Betula pendula Roth. as reference species. Foliar nitrogen in the N2-fixing plants was almost totally derived from N2 fixation. Plots containing N2-fixing species generally had significantly higher soil N and N availability than a control plot without N2-fixing plants. Taken together, all measurements indicated that N2-fixing plants can be used to effectively improve soil fertility at high latitudes in northern Sweden.
机译：在许多研究中都观察到豆类和放线植物对氮贫瘠的土壤产生了积极影响，但在高纬度地区所做的工作很少，这就是我们的研究重点。我们在瑞典北部北极圈附近的地点测量了N2 固着和土壤N的几个指标。 20多年前，在这片退化的森林地上种植了羽扇豆（Lupinus nootkatensis Donn）和灰al木（Alnus incana L. Moench）。我们用埋袋技术测量了土壤总氮，净氮矿化和硝化作用，以及在离子交换膜上收集的NH + 4 和NO- 3 的通量。我们还利用Betula pendula Roth的15 Ns叶片的自然丰度来估计固氮植物的固氮活性。作为参考物种。 N2 固定植物中的叶面氮几乎全部来自N2 固定。与没有固氮植物的对照样地相比，含有固氮种的样地通常具有更高的土壤氮和氮利用率。综上所述，所有测量结果表明，固氮植物可用于有效提高瑞典北部高纬度地区的土壤肥力。

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