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首页> 外文期刊>Oecologia >Plant and soil natural abundance δ 15N: indicators of relative rates of nitrogen cycling in temperate forest ecosystems
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Plant and soil natural abundance δ 15N: indicators of relative rates of nitrogen cycling in temperate forest ecosystems

机译：植物和土壤的自然丰度δ15 N：温带森林生态系统中氮循环相对速率的指标

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摘要

Watersheds within the Catskill Mountains, New York, receive among the highest rates of nitrogen (N) deposition in the northeastern United States and are beginning to show signs of N saturation. Despite similar amounts of N deposition across watersheds within the Catskill Mountains, rates of soil N cycling and N retention vary significantly among stands of different tree species. We examined the potential use of δ 15N of plants and soils as an indicator of relative forest soil N cycling rates. We analyzed the δ 15N of foliage, litterfall, bole wood, surface litter layer, fine roots and organic soil from single-species stands of American beech (Fagus grandifolia), eastern hemlock (Tsuga canadensis), red oak (Quercus rubra), and sugar maple (Acer saccharum). Fine root and organic soil δ 15N values were highest within sugar maple stands, which correlated significantly with higher rates of net mineralization and nitrification. Results from this study suggest that fine root and organic soil δ 15N can be used as an indicator of relative rates of soil N cycling. Although not statistically significant, δ 15N was highest within foliage, wood and litterfall of beech stands, a tree species associated with intermediate levels of soil N cycling rates and forest N retention. Our results show that belowground δ 15N values are a better indicator of relative rates of soil N cycling than are aboveground δ 15N values.
机译：纽约州卡茨基尔山脉内的流域获得美国东北部最高的氮（N）沉积率，并开始显示N饱和的迹象。尽管卡茨基尔山脉内流域的氮沉降量相似，但不同树种的林分土壤氮循环速率和氮保留率差异很大。我们研究了植物和土壤中δ15N的潜在用途，作为森林土壤相对氮循环速率的指标。我们分析了美洲山毛榉（Fagus grandifolia），东铁杉（Tsuga canadensis），红橡树（Tsuga canadensis）单种林分中的树叶，凋落物，胆材，表层凋落物，细根和有机土壤的δ15N。栎（Quercus rubra）和糖枫（Acer saccharum）。糖枫林中细根和有机土壤的δ15 N值最高，这与较高的净矿化和硝化速率显着相关。这项研究的结果表明，细根和有机土壤δ15N可以用作土壤氮循环相对速率的指标。尽管在统计学上不显着，但在山毛榉林的枝叶，木材和凋落物中的δ15 N最高，这是与土壤氮循环速率和森林氮保留的中间水平相关的树种。我们的结果表明，地下δ15 N值比地下δ15 N值更好地指示了土壤氮循环的相对速率。

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