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首页> 外文期刊>Plant Ecology & Diversity >Temporal patterns of inorganic nitrogen uptake by mature sugar maple (Acer saccharum Marsh.) and red spruce (Picea rubens Sarg.) trees using two common approaches
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Temporal patterns of inorganic nitrogen uptake by mature sugar maple (Acer saccharum Marsh.) and red spruce (Picea rubens Sarg.) trees using two common approaches

机译：使用两种常见方法，成熟的糖枫树（槭树沼泽）和红云杉树（Picea rubens Sarg。）树吸收无机氮的时间模式。

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Background: Plant uptake of nitrogen influences many ecosystem processes, yet uptake by trees in northern forests of the United States has not been quantified throughout the growing season. Aims: To measure NH4 + and NO3 − uptake by mature sugar maple (Acer saccharum) and red spruce (Picea rubens) trees during the early, mid and late growing season. Methods: At Hubbard Brook Experimental Forest, New Hampshire, we used two approaches to measure nitrogen uptake capacity by mature trees: an in situ depletion method using intact roots and an ex situ 15N tracer method using excised roots. Results: NH4 + uptake was greater than NO3 − for both methods and tree species (P 0.05). NH4 + uptake was lowest during the early growing season, while NO3 − uptake was lowest during the late growing season. Measured rates of NH4 + uptake were 2-3 orders of magnitude greater using the in situ depletion method compared with the ex situ 15N tracer method. Conclusions: These results demonstrate seasonal differences in nitrogen uptake by two dominant tree species in a northern forest and show that the method employed can significantly impact measured rates of uptake, which could have implications for understanding the magnitude of plant nitrogen uptake and for cross-study comparisons of this process.View full textDownload full textKeywordsdepletion method, excised roots, 15N tracer, nutrient uptake, stable isotopesRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/17550874.2011.624557
机译：背景：植物对氮的吸收会影响许多生态系统过程，但是在整个生长季节，尚未量化美国北部森林中树木对氮的吸收。目的：测定成熟糖枫（Acer saccharum）对NH 4 + 和NO 3 ∠的吸收和生长初期，中期和后期的红色云杉（Picea rubens）树。方法：在新罕布什尔州的哈伯德布鲁克实验森林中，我们使用了两种方法来测量成熟树木的氮素吸收能力：采用完整根的原位耗竭方法和采用去除根的异位 15 N示踪法。结果：方法和树种的NH 4 + 吸收均大于NO 3 ∠（P <0.05）。在生长早期，NH 4 + 吸收最低，而NO 3 ∠吸收最低。生长后期。与原位 15 N示踪剂相比，使用原位消耗法测得的NH 4 + 吸收速率高2-3个数量级方法。结论：这些结果证明了北部森林中两种优势树种氮素吸收的季节差异，并表明所采用的方法可显着影响测得的吸收率，这可能对理解植物氮素吸收的量和交叉研究具有影响。此方法的比较。查看全文下载全文关键词枯竭法，切掉的根，15N示踪剂，养分吸收，稳定同位素相关var addthis_config = { ，facebook，stumbleupon，digg，google，更多”，发布号：“ ra-4dff56cd6bb1830b”};添加到候选列表链接永久链接http://dx.doi.org/10.1080/17550874.2011.624557

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