| 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 |
| Key Words: irrigation-nitrogen treatments freezing thawing nitrate nitrogen soil phase transition migration accumulation |
| Author Name | Affiliation | | LIU Shan-shan | College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | ZHENG Xiu-qing | College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | CHEN Jun-feng | College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | WU Bo | College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: |
| 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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