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采用直管型和弯管型渗漏计,对不同施氮水平下水稻生育期间渗漏水中的铵态氮、硝态氮和全氮浓度进行测定分析.结果表明:2007年直管与弯管渗漏计中渗漏水的铵态氮浓度变化范围均在0~8 mg.L-1,高于2006年0~4 mg.L-1的铵态氮浓度变化范围;2007年直管渗漏计中渗漏水的硝态氮浓度主要集中在0~4 mg.L-1,与2006年基本一致,而弯管渗漏计中渗漏水的硝态氮浓度变化较大,其变动范围主要集中在0~20 mg.L-1,高于2006年的硝态氮浓度;2007年渗漏水中的全氮浓度变化范围为0~60 mg.L-1,远高于2006年0~16 mg.L-1的全氮浓度变化范围.稻田渗漏水中的氮素以硝态氮为主.2007年直管型渗漏计中总氮(TN)渗漏流失负荷为15.81 kg.hm-2,NO3--N为9.33 kg.hm-2,弯管型渗漏计中TN渗漏流失负荷为7.21 kg.hm-2,NO3--N为4.25 kg.hm-2.稻田渗漏水中铵态氮和硝态氮的渗漏流失途径不同,应当采用不同的计算方法估算直管型及弯管型渗漏计中的氮素渗漏量,采用直管型渗漏计对氮素渗漏量的估算较接近于用测坑试验测定的氮素渗漏负荷.
The concentrations of ammonium nitrogen, nitrate nitrogen and total nitrogen in seepage water during rice growth period under different nitrogen levels were measured and analyzed with straight tube type and elbow type leakage gauge.The results showed that in 2007, Leakage of seepage meter ammonium nitrogen concentration range of 0 ~ 8 mg.L-1, higher than the 0 ~ 4 mg.L-1 in 2006 ammonium nitrogen concentration range; straight pipe seepage in 2007 Leakage in leakage meter nitrate concentration mainly concentrated in the 0 ~ 4 mg.L-1, consistent with 2006, while the leaking water meter leak meter nitrate concentration changes, the changes The range was mainly 0-20 mg · L -1, which was higher than the nitrate nitrogen concentration in 2006. The concentration of total nitrogen in seepage water in 2007 ranged from 0-60 mg · L -1, much higher than that in 2006 ~ 16 mg.L-1, and the nitrate nitrogen was the main factor in the seepage water of paddy field.The total nitrogen (TN) leakage loss in the direct seepage meter in 2007 was 15.81 kg. hm-2, NO3 - N was 9.33 kg.hm-2, TN leakage loss of elbow leakage meter was 7.21 kg.hm-2 and NO3-N was 4.25 kg.hm-2. Leakage of ammonium nitrogen and nitrate nitrogen seepage through different ways, should be calculated using different methods of straight and curved Nitrogen leakage Leakage meter type, the use of a straight tube meter estimate of the leak is closer to the nitrogen leakage of nitrogen leaching test pits measured by the load measurement.