| 刘姗姗,郑秀清,陈军锋,吴博.水氮用量组合对冻融期土壤相变区硝态氮迁移与累积的影响[J].干旱地区农业研究,2017,35(6):166~172 |
| 水氮用量组合对冻融期土壤相变区硝态氮迁移与累积的影响 |
| Effect of irrigation and nitrogen treatments on nitrogen migration and accumulation in soil phase transition during freezing-thawing period |
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| DOI：10.7606/j.issn.1000-7601.2017.06.25 |
| 中文关键词: 水氮用量组合 冻结期 消融期 硝态氮 土壤相变区 迁移 累积 |
| 英文关键词:irrigation-nitrogen treatments freezing thawing nitrate nitrogen soil phase transition migration accumulation |
| 基金项目:国家自然科学基金项目（41572239）；教育部博士点基金项目（20131402110008）；山西省自然科学基金项目（2015021169） |
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| 中文摘要: |
| 为了研究冻融期水氮用量对土壤硝态氮迁移及累积的影响，设置了两个灌水量（375、750 m3·hm-2）、三个施肥水平（100、300 kg·hm-2和500 kg·hm-2）组成6种水氮组合，进行田间冬灌试验。结果表明，水氮处理显著增加了相变区（0～60 cm）土壤硝态氮水平，各处理下硝态氮累积量差异显著。未冻期和冻结期0～60 cm土壤硝态氮累积量随水、氮量的增加而增加，消融期硝态氮累积量随肥量的增加而增加。冻结前、后期土壤剖面聚氮区（特指硝态氮）由0～30 cm逐渐下移至30～60 cm。硝态氮向相变区的迁移量随水氮量的增加而呈增加态势，在N500下迁移趋势更明显。封冻前0～30 cm土壤硝态氮的相对累积量随灌水量增加而降低，30～60 cm土层则增加。冻结期，随施氮量的增加，0～30 cm土层硝态氮相对累积量增加，30～60 cm土层则降低。消融期0～30 cm土层硝态氮相对累积量随施氮量的增加而增加，随灌水量的增加而减少，而30～60 cm土层则呈现相反规律。 |
| 英文摘要: |
| In order to study the influences of irrigation and nitrogen treatments on soil nitrate migration and accumulation during freezing-thawing period, nitrate transfer experiment was conducted in freezing-thawing period under six irrigation×nitrogen treatments of two irrigation levels (375,750 m3·hm-2) and three levels of fertilizer application (100, 300, 500 kg·hm-2). The results showed that fertilizer and irrigation significantly increased the nitrate accumulation of the 0～60 cm, and the accumulation was significantly different. In unfrozen and frozen stages, accumulation amount at 0～60 cm layers increased with the increase of irrigation level and nitrogen rate, and increased with the increase of the fertilizer during thawing period. Nitrate accumulative area moved down from 0～30 cm to 30～60 cm in the prophase and anaphase of freezing. Nitrate migration amount was increased with the increase of irrigation level and nitrogen rate, and the migration effect was obvious at N500. Pre-period of freezing, with the increase of irrigation level, relative nitrate nitrogen of soil in 0～30 cm layer decreased, and that of soil in 30～60 cm increased. Relative nitrate nitrogen of soil in 0～30 cm layer increased with the increase of nitrogen rate in freezing period, but decreased in 30～60 cm depth. In thawing period, relative accumulation of nitrate nitrogen in 0～30 cm soil increased with the increase of nitrogen rate, but decreased with the increase of irrigation level, while the 30～60 cm soil layer showed the opposite laws. |
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