中国农业科学 ›› 2015, Vol. 48 ›› Issue (20): 4086-4099.doi: 10.3864/j.issn.0578-1752.2015.20.010

• 土壤肥料·节水灌溉·农业生态环境 • 上一篇    下一篇

冬小麦生育期内土壤氮素的时空变异

马亚斌1, 2, 3,宋晓宇1, 3,杨贵军1, 3,王仁红1, 3,全斌2,竞霞2,刘晓2   

  1. 1国家农业信息化工程技术研究中心,北京100097
    2西安科技大学,西安710054
    3农业部农业信息技术重点实验室,北京100097
  • 收稿日期:2015-01-20 出版日期:2015-10-20 发布日期:2015-10-20
  • 通讯作者: 宋晓宇,Tel:010-51503647;E-mail:songxy@nercita.org.cn
  • 作者简介:马亚斌,Tel:18600902495;E-mail:992164971@qq.com
  • 基金资助:
    国家自然科学基金(41201326,41371349)、北京市自然科学基金(4141001)、北京市农林科学院科技创新能力建设项目(KJCX20140417)

Temporal and Spatial Variation of Soil Nitrogen Within Growth Stage of Winter Wheat

MA Ya-bin1, 2, 3, SONG Xiao-yu1, 3, YANG Gui-jun1, 3, WANG Ren-hong1, 3, QUAN Bin2, JING Xia2, LIU Xiao2   

  1. 1National Engineering Research Center for Information Technology in Agriculture, Beijing 100097
    2Xian University of Science and Technology, Xian 710054
    3Key Laboratory of Agri-Informatics, Ministry of Agriculture, Beijing 100097
  • Received:2015-01-20 Online:2015-10-20 Published:2015-10-20

摘要: 【目的】研究冬小麦生育期内土壤溶液中硝态氮及铵态氮的时空变化特征及变量追肥对其含量变化的影响,以期为田间作物的栽培与管理提供参考依据。【方法】以国家精准农业研究示范基地2013—2014年小麦试验为例,采用常规统计分析与地统计分析两种方法分别探索土壤溶液中硝态氮与铵态氮在时间序列上的变化特征及空间结构特征,并采用普通克里金插值法获取硝态氮与铵态氮空间分布图,最终比较分析了冬小麦生育期内硝态氮与铵态氮的空间变化规律。【结果】通过常规统计分析发现冬小麦起身期至收获期内,土壤溶液中铵态氮含量受追肥影响不明显,整体呈降低趋势,而硝态氮含量受追肥影响,呈先降低后升高又降低的趋势;在起身、拔节、开花与灌浆期,不同追肥处理间铵态氮的变化没有显著差异,在收获期,D、S处理与其他不同处理间有显著或极显著差异;硝态氮的变化在起身与开花期,不同处理间没有显著差异,在拔节期,BH处理与其他各处理间均有极显著差异;在灌浆期,CK处理与T处理、D处理、S处理间均有极显著差异;在收获期,D处理与其他各处理间有显著或极显著差异。通过地统计分析发现起身、拔节、收获期的铵态氮空间分布均一度较高,连续性强,空间自相关性好,而开花、灌浆期其空间分布差异较大,受随机因素影响严重;拔节、灌浆、收获期的硝态氮空间分布连续性强,均一度高,空间自相关性好,而起身、开花期其空间分布差异较大,空间自相关性较弱。分析对比硝态氮与铵态氮的空间插值图发现硝态氮在起身与拔节期,试验区北部含量低于南部,到开花与灌浆期整个试验区硝态氮含量普遍较高,到收获期变为北部含量高于南部;铵态氮在起身期,试验区北部含量低于南部且由北往南含量逐渐升高呈条带状分布,到开花与灌浆期其空间分布差异较大,到收获期北部含量明显高于南部。【结论】变量追肥对于铵态氮的变化趋势没有影响,提高了硝态氮含量且主要发生在开花期,同一生育期内不同处理之间对于它们含量的变化是有差异的。

关键词: 土壤溶液, 硝态氮, 铵态氮, 变量追肥, 时空变异

Abstract: 【Objective】 This study’s aim was to explore the temporal and spatial variation characteristics of ammonium nitrogen and nitrate nitrogen in a soil solution within the growth stage of winter wheat, and to analyze the influence on the change of their content under variable topdressing treatments, in order to provide references for the cultivation and management of field crops. 【Method】To take the 2013-2014 year winter wheat experiment at National Precision Agriculture Experimental Station as an example, two methods including conventional statistics and geostatistics were respectively used to explore the variation characteristics of the time series and spatial structure characteristics of the ammonium nitrogen and nitrate nitrogen, making the interpolation charts of ammonium nitrogen and nitrate nitrogen with ordinary kriging interpolation, and finally analyzing the spatial variation rules of nitrate nitrogen and ammonium nitrogen in a whole growth stage of winter wheat. 【Result】Through the conventional statistic analysis: From the upstage to the harvest stage of winter wheat, the ammonium nitrogen content in soil solution was not obviously influenced by topdressing and had a decreasing trend while the nitrate nitrogen content was influenced by topdressing, and the performance for that change was first a decrease then an increase and decrease; The change of ammonium nitrogen had no difference between different topdressing treatments in the up, jointing, flowering, and filling stages, and has a significant or great significant difference between the D treatment, S treatment, and others in the harvest stage; while that of nitrate nitrogen made no difference between different treatments in the up and flowering stages, and showed a great significant difference between the BH treatment and others in the jointing stage, and showed a great significant difference between the CK and T, D, and S treatments in the filling stage, and showed a significant or great significant difference between the D treatment and others in the harvest stage. Through the geostatistics analysis: The spatial distribution of ammonium nitrogen showed more even, continuous, and higher spatial autocorrelation in the up, jointing, and harvest stages, and showed larger differences and more serious influences by random factors in the flowering and filling stages while that of nitrate nitrogen showed a more even, continuous, and higher spatial autocorrelation in the jointing, filling, and harvest stages, and showed larger differences and a lower spatial autocorrelation in the up and flowering stages. Through analyzing the spatial interpolation charts of ammonium nitrogen and nitrate nitrogen, the content of nitrate nitrogen in the north of experimental area was lower than that in the south in the up and jointing stages, and showed high in the whole experimental area in the flowering and filling stages, and then became higher in the north of the experimental area than that in the south in the harvest stage, while that of ammonium nitrogen in the north of experimental area was lower than that in the south in the up stage, showed a rising trend gradually from the north to the south in the experimental area, and had a strip distribution. In the flowering and filling stages, its spatial distribution had a big difference, in the harvest stage the content of ammonium nitrogen in the north of the experimental area was obviously higher than that in the south. 【Conclusion】Variable topdressing has no influence on the change of ammonium nitrogen and increases the content of nitrate nitrogen in the flowering stage, and there exists something different in changing their content between different treatments within one growth stage.

Key words: soil solution, nitrate nitrogen, ammonium nitrogen, variable topdressing, temporal and spatial variation