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首页> 外文期刊>Soil Science Society of America Journal >Ammonia Volatilization Following Fertilization with Urea or Ureaform in a Thinned Loblolly Pine Plantation
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Ammonia Volatilization Following Fertilization with Urea or Ureaform in a Thinned Loblolly Pine Plantation

机译：火炬松人工林中尿素或尿素施肥后的氨挥发

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摘要

Volatilization losses following fertilization with urea or ureaform applied at a rate of 448 kg ha(-1) N were measured in a thinned 22-yr-old loblolly pine (Pinus taeda L.) plantation in the Virginia Piedmont. Fertilizer was applied at two different times, winter and summer, and NH3 volatilization was measured for 29 d using a static chamber method. The majority of the NH3 volatilization occurred during the first 7 to 9 d following fertilization. Larger amounts of NH3 were volatilized following fertilization with urea than with ureaform. Following application in the summer, 51% of the applied N was volatilized from urea while only 7% of the applied N was volatilized from ureaform. The amount of N volatilized following urea application in the winter was 18% compared to 11% following ureaform application. This study highlights the risks of N loss through volatilization associated with urea fertilization, especially when it is applied during the growing season. These results also indicate that slow release N fertilizers such as ureaform can decrease volatilization losses following surface application in loblolly pine forest ecosystems and may, therefore, increase N uptake by the trees.
机译：在维吉尼亚州皮埃蒙特的一棵22岁薄火炬松（Pinus taeda L.）人工林中，测定了以448 kg ha（-1）N施用尿素或尿素形式施肥后的挥发损失。在冬季和夏季两个不同的时间施肥，并使用静态室法测量NH3挥发29天。大部分NH3挥发发生在受精后的前7到9 d。施肥后，尿素中的NH3挥发量要大于尿素形式。在夏季施用后，施用的氮中有51％的氮从尿素中挥发出来，而施用的N中只有7％的氮从尿素形式中挥发出来。冬季施用尿素后挥发的氮量为18％，而施用尿素样后挥发的N为11％。这项研究强调了尿素施肥引起的挥发氮损失的风险，特别是在生长季节施用时。这些结果还表明，缓释氮肥（如尿素）可以减少在火炬松森林生态系统中表面施用后的挥发损失，因此可能增加树木对氮的吸收。

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