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Availability of residual fertilizer (15) N from forest floor and mineral

机译：森林地表和矿物中剩余肥料（15）N的有效性

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摘要

As low initial uptake and essentially zero later uptake limit efficacy of N fertilization for temperate conifers, we investigated factors limiting long-term tree uptake of residual (15) N-labeled fertilizer. We used a pot bioassay to assess availability of (15) N from soil sampled 10 years after fertilization of a Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stand with (15) N-urea (200 kg N ha(-1)). Douglas-fir seedlings were grown for 2 years in organic (designated LFH) and mineral soil (0-10 cm) layers reconstructed from control and fertilized plots; residual fertilizer N amounted to 10 % of LHF and 5 % of MIN N. Percentage recovery of residual (15) N in seedlings was not affected by the original season of fertilization (spring vs. fall), but differed by the source of (15) N excess. LFH was a better source of residual (15) N; 12.4 % of residual LFH (15) N was taken up by seedlings and 7.6 % transferred to soil, whereas mineral soil yielded only 8.3 % of residual (15) N to seedling uptake and 2.4 % to LFH. Extractable inorganic N was 2-3 orders of magnitude higher in fallow pots. Ten-year residual fertilizer (15) N was clearly cycling between LFH and mineral soil and available to seedlings, indicating that other factors such as denitrification, leaching, and asynchrony of soil N mineralization and tree uptake limit long-term residual N fertilizer uptake in the field
机译：由于温带针叶树的低氮肥初始吸收量和后期氮吸收量基本上为零，因此我们研究了限制残留（15）N标记肥料长期树木吸收的因素。我们使用盆栽生物测定法评估了道格拉斯冷杉（Pseudotsuga menziesii（Mirb。）Franco）立场施肥后（10）N-脲（200 kg N ha（-1） ））。花旗松幼苗在从对照和施肥地块重建的有机层（指定为LFH）和矿质土壤（0-10厘米）中生长了2年。残留的肥料氮量为LHF的10％和MIN N的5％。幼苗中残留（15）N的回收率不受原始施肥季节（春季与秋季）的影响，但因（15 ）氮过量。 LFH是残留（15）N的更好来源;幼苗吸收了12.4％的残留LFH（15）N，并将其转移到土壤中的比例为7.6％，而矿质土壤仅吸收了8.3％的残留（15）N吸收了幼苗，吸收了2.4％的LFH。休耕盆中可萃取的无机氮含量高出2-3个数量级。十年残留肥料（15）氮显然在LFH和矿质土壤之间循环，并可供苗木利用，表明其他因素（例如反硝化，淋溶和土壤氮矿化和树木吸收的异步性）限制了土壤中长期残留氮肥的吸收。场

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