Nitrogen availability in the taiga forest ecosystem of northeastern Siberia
Nitrogen availability in the taiga forest ecosystem of northeastern Siberia
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西伯利亚东北部针叶林生态系统的氮可用性
DOI：
10.1080/00380768.2013.772495
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发表时间：
2013
影响因子：
2
通讯作者：
Sugimoto A
中科院分区：
文献类型：
--
作者：
Popova A.;Tokuchi N.;Ohte N.;Ueda U. M.;Osaka K.;Maximov T.;Sugimoto A
在西伯利亚东北部雅库茨克附近的Spasskaya Pad实验林生态系统中观测了土壤无机氮循环及其动态，以估算落叶松（Larix cajanderi-Mayr.）森林中的土壤总氮库占866 g N m−2（0-50 cm），而高达1.7%（14.6 g N m−2）是氯化钾（KCl）可提取的无机氮。无机氮以铵态氮为主。土壤无机氮库的大小具有季节性波动。土壤氮素矿化在7月中旬至8月上旬的某个时间点开始活跃。在前一个夏天结束时积累的无机氮的土壤池被消耗的第二个夏天开始通过微生物固定，这可能已经开始在9月。氮在土壤中的再循环很重要，因为通过沉积输入的无机氮非常少（48 mg N m− 2年−1）。15 N示踪试验表明，落叶松不以氨基酸（丙氨酸）形式吸收有机氮，而是以铵态氮和硝态氮为氮源。植物的有效氮量被评估为土壤溶液中的水提取无机氮，通过植物蒸腾作用驱动的物质流输送到生根区，在生长季节-1（6月、7月和8月0-50 cm的矿质土壤层），它占1.9 × 103（树木为1.2 × 103）mg N m− 2。预计土壤中的微生物也会竞争这种有效氮。我们的研究结果表明，尽管有大量的无机氮的生产，氮的有效性为植物是低的无机氮的土壤库建立在相同的速度落叶松衰老。
The inorganic nitrogen (N) cycle and its dynamics in the soil were observed in the ecosystem at the Spasskaya Pad experimental forest near Yakutsk in northeastern Siberia in order to estimate the N availability for the larch (Larix cajanderiMayr.) The soil pool of bulk N in the forest accounted for up to 866 g N m−2(0–50 cm), whereas up to 1.7% (14.6 g N m−2) was potassium chloride (KCl)-extractable inorganic N. Ammonium was a dominant form of inorganic N. The size of the soil inorganic N pool fluctuated seasonally. It was small in the beginning of the summer and increased rapidly once the cumulative degree day of the soil temperature at 20 cm reached more than 300 (°C days), indicating that active N mineralization began at some point from the middle of July to the beginning of August. This soil pool of inorganic N that had accumulated at the end of the previous summer was consumed by the beginning of the next summer through microbial immobilization, which may have begun in September. Recycling of N in the soil was important because the input of inorganic N by deposition was very small (48 mg N m−2year−1). A tracer15N experiment showed that larch did not uptake organic N in the form of amino acid (alanine); rather, it used ammonium and nitrate as N sources. The amount of available N for plants was assessed as water-extractable inorganic N in the soil solution that was transported to the rooting area by mass flow driven by plant transpiration, and it accounted for 1.9 × 103(1.2 × 103for trees) mg N m−2during the growing season−1(0–50 cm of the mineral soil layer in June, July, and August). Microorganisms in the soil are also expected to be competing for this available N. Our results show that despite a large amount of inorganic N production, N availability for plants is low as the soil pool of inorganic N is built up at the same rate as larch senescence.
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DOI：
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发表时间：
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期刊：
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