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沈阳市区降水中氮素的组成及季节变化

宋欢欢,姜春明,宇万太**   

  1. (中国科学院沈阳应用生态研究所, 沈阳 110016)
  • 出版日期:2014-03-10 发布日期:2014-03-10

Composition and seasonal fluctuation of nitrogen from precipitation in urban area of Shenyang.

SONG Huan-huan, JIANG Chun-ming, YU Wan-tai**   

  1. (Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China)
  • Online:2014-03-10 Published:2014-03-10

摘要:

于2012年2—12月在沈阳市区采集降水样品,分析了各形态氮素的浓度和沉降通量,探讨了影响氮沉降的相关因素。结果表明:NH4+-N、NO3--N及DON的平均浓度分别为1.57、0.87和0.82 mg N·L-1,随降水进入该地区的总氮沉降量26.17 kg N·hm-2·a-1,其中NH4+-N、NO3--N和DON分别为12.56、7.02和6.59 kg N·hm-2·a-1,与降水量呈幂型正相关;通过分析各形态氮素季节变异可知,降水中的氮主要来自当地工农业生产,同时受当时降水量的影响。
 

关键词: 干物质积累, 籽棉产量, 土壤硝态氮, 水氮利用效率, 水氮调控

Abstract: In the  urban area of Shenyang, we sampled precipitation from February to December in the year of 2012, investigated the nitrogen (N) concentration and deposition flux from precipitation, and elucidated the possible factors influencing the variation of N deposition. The results showed that the average concentrations of NH4+-N, NO3--N and DON were 1.57, 0.87 and 0.82 mg N·L-1, respectively. The total N deposited from precipitation was 26.17 kg N·hm-2·a-1, among which the deposition of NH4+-N, NO3--N and DON were 12.56, 7.02 and 6.59 kg N·hm-2·a-1, respectively. The N deposition was positively correlated with precipitation when fitted with a power equation. Seasonal fluctuations of different N forms suggested N deposition was mainly derived from the local industrial and agricultural production; in the meantime, the precipitation amount also played an important role.

Key words: water and nitrogen arrangement, seed-cotton yield, soil nitrate., dry matter accumulation, water and nitrogen use efficiency