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首页> 外文会议>Acid Rain 2000 >NITROGEN RETENTION IN JAPANESE CEDAR STANDS IN NORTHERN HONSHU, WITH HIGH NITROGEN DEPOSITION
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NITROGEN RETENTION IN JAPANESE CEDAR STANDS IN NORTHERN HONSHU, WITH HIGH NITROGEN DEPOSITION

机译：氮素沉积高的北部北部本州日本雪松林中的氮保留

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High nitrogen, especially ammonium, input has been observed in Shichinohe, Aomori Prefecture, northeastern Japan. A monitoring study on precipitation, throughfall, and stream water has been carried out to estimate the stage of nitrogen saturation since 1996. Fifty-two to 70 % of nitrogen input in throughfall was retained in forest ecosystems. Nitrate concentration in stream water tended to decrease throughout the study. There was no symptom of nitrogen saturation at Japanese cedar stands in Shichinohe, although high nitrogen input in open bulk has been observed. Ammonium (NH_4~+) was retained in the canopy. The ratio of NH_4~+ input in throughfall to that by open bulk was 0.40 - 0.47. Total inorganic nitrogen input under the canopy amounted 0.68 - 0.72 kmolc ha~(-1) yr~(-1) (9.6 -10.0 kg N ha~(-1) yr~(-1)). Our results suggests that atmospheric nitrogen input has benefitted the tree growth.
机译：在日本东北的青森县七户河，观察到高氮特别是铵的输入。自1996年以来，已经进行了一项有关降水，穿透水和溪流水的监测研究，以估算氮的饱和阶段。穿透水的氮输入中有52％至70％保留在森林生态系统中。在整个研究过程中，溪流水中的硝酸盐浓度趋于下降。尽管已经观察到在开放堆中高氮输入，但在Shichinohe的日本雪松林中没有氮饱和的症状。铵（NH_4〜+）被保留在冠层中。穿透中NH_4〜+的输入与疏松的NH_4〜+的输入比例为0.40-0.47。冠层下的无机总氮输入量为0.68-0.72 kmolc ha〜（-1）yr〜（-1）（9.6 -10.0 kg N ha〜（-1）yr〜（-1））。我们的结果表明，大气中的氮输入有益于树木的生长。

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