Measurement of ammonia volatilization from flooded paddy fields in Vietnam
Measurement of ammonia volatilization from flooded paddy fields in Vietnam
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DOI：
10.1111/j.1747-0765.2009.00419.x
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发表时间：
2009-12
影响因子：
2
通讯作者：
Takeshi Watanabe;T. T. Son-T.;N. N. Hung-N.;Nguyen van Truong;T. Q. Giàu;K. Hayashi;O. Ito
中科院分区：
文献类型：
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作者：
Takeshi Watanabe;T. T. Son-T.;N. N. Hung-N.;Nguyen van Truong;T. Q. Giàu;K. Hayashi;O. Ito
摘要 采用动态室法测量了越南三个地点稻田氨挥发造成的氮（N）损失。两个地点位于越南北部，并在夏季和春季测量了挥发量。第三个地点位于越南南部的湄公河三角洲地区，在旱季和雨季测量了挥发量。尿素施用量为 20–40 kg N ha−1，分次施用，在种植季节总共施用 80–100 kg N ha−1。施用尿素后 1 或 3 天观察到 NH3 通量达到峰值，随后在 9 天内急剧下降至通常低于 1 mg N m−2 h−1。在施肥后的前 10 天和整个种植期内，NH3 挥发造成的氮损失估计分别为施氮量的 0.5-19.7% 和 1.7-14.6%，表明 NH3 挥发是越南稻田氮素损失的重要途径。
Abstract Nitrogen (N) loss through ammonia volatilization from paddy fields at three sites in Vietnam was measured using the dynamic chamber method. Two sites were located in northern Vietnam and volatilization was measured in the summer and spring. The third site was in the Mekong Delta region in southern Vietnam and volatilization was measured in the dry and wet seasons. Urea was applied at 20–40 kg N ha−1 as a split application and a total of 80–100 kg N ha−1 was applied in the cropping season. Peaks in the NH3 flux were observed at 1 or 3 days after the application of urea, followed by a sharp decline to generally less than 1 mg N m−2 h−1 within 9 days. The estimated N losses by NH3 volatilization during the first 10-day period after fertilizer application and throughout the cropping period were 0.5–19.7% and 1.7–14.6% of the applied N, respectively, indicating that NH3 volatilization was a significant pathway of N loss from these Vietnamese paddy fields.