1. 安徽农业大学资源与环境学院,合肥,230036
2. 安徽农业大学理学院,合肥,230036
[ "董世杰(1992-),男,在读硕士研究生,主要从事应用气象研究。E-mail:dongshijiework@163.com" ]
纸质出版:2018
移动端阅览
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董世杰, 鲁屹, 唐婉莹, 等. 聚天门冬氨酸钙盐对水稻田面水中三氮动态变化的影响[J]. 水土保持学报, 2018,32(6):208-213. DOI: 10.13870/j.cnki.stbcxb.2018.06.030.
DONG Shijie, LU Yi, TANG Wanying, et al. Effects of Polyaspartic Acid Calcium Salt on the Dynamic Changes of NH[J]. 2018, 32(6): 208-213. DOI: 10.13870/j.cnki.stbcxb.2018.06.030.
利用桶栽试验探究不同浓度水平的聚天门冬氨酸钙盐(PASP-Ca)对水稻田面水中铵态氮(NH4+)、硝态氮(NO3-)和总氮(TN)浓度动态变化的影响。结果表明,施氮后,田面水中TN、NH4+和NO3-分别于第1,3,9天达到最大值,随后逐渐降低。NO3-/TN多在0.1以下,(NH4++NO3-)/TN多在0.5以上。因此,可以将NH4+和TN作为农田水污染防治的主要监测指标,NO3-作为辅助指标。添加一定浓度的PASP—Ca能对田面水中氮素浓度的变化起到缓释作用,其中0.3%浓度水平的PASP—Ca效果相对较好,田面水中NH4+和TN的下降速率分别为3.452,4.806 mg/(L·d),与单施氮肥(CK)相比,分别降低了11.68%和16.25%;同时,NH4+的平均浓度为6.999 mg/L,较CK低了3.88%;NO3-的平均浓度为0.396 mg/L,较CK低了24.83%;TN的平均浓度为20.077 mg/L,较CK提升了3.10%。施氮后田面水中TN浓度随时间呈对数递减,而NH4+浓度在施氮后3天内随时间呈对数增加,之后随时间呈对数递减趋势。施氮后的9天内是防止稻田田面水中氮素流失的关键时期。
A barrels planted experiment was conducted to study the effects of PASP-Ca with different concentration levels on the dynamic changes of NH4+
NO3- and total nitrogen (TN) concentrations in surface water of paddy field. The result showed that the concentrations of TN
NH4+ and NO3- in the surface water of paddy field reached the maximum within 1 day
3 days and 9 days respectively after nitrogen application. NO3-/TN was less than 0.1 and (NH4++NO3-)/TN was more than 0.5. Therefore
NH4+ and TN could be used as the main monitoring indicators
and NO3- as an auxiliary indicator for the prevention and control of farmland water pollution. Adding a certain concentration of PASP-Ca had slow release effects for the changes of nitrogen concentrations in surface water of paddy field
while the effects of PASP-Ca at 0.3% concentration level was relatively better
the reduction rates of NH4+ and TN in surface water of paddy field were 3.452 mg/(L·d) and 4.806 mg/(L·d) respectively. Compared with apply nitrogen only (CK)
the reduction rates by 11.68% and 16.25%. Meanwhile
the average concentration of NH4+ was 6.999 mg/L
which was 3.88% lower compared with CK. The average concentration of NO3- was 0.396 mg/L
which was 24.83% lower compared with CK. The average concentration of TN was 20.077 mg/L
which was 3.10% higher compared with CK. The dynamic changing trends of NH4+ and TN concentrations with time could be expressed by logarithmic equations. After nitrogen application
the TN concentrations in paddy field decreased logarithmically with time
while the concentrations of NH4+ increased logarithmically in 3 days
and then decreased logarithmically with time. 9 days after nitrogen application was the key stage to prevent nitrogen loss in surface water of paddy field.
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