期刊文献+

黄土高原苹果园地深层土壤氮素含量与分布特征 被引量:16

Soil nitrogen contents and deep profile distributions in apple orchards of the Loess Plateau
下载PDF
导出
摘要 在黄土高原的凤翔、白水、长武、西峰、延安和静宁等6个苹果产区,测定了6~28龄苹果园地0—300 cm土层土壤的全氮、铵态氮和硝态氮含量,分析和比较了不同地区和不同树龄果园土壤全氮、铵态氮和硝态氮含量及其剖面分布特征。结果表明:1)不同地区和不同树龄果园土壤全氮含量为0.19 g/kg(延安)~1.28 g/kg(白水),土壤铵态氮含量为5.19 mg/kg(静宁)~39.46 mg/kg(长武),土壤硝态氮含量为3.97 mg/kg(延安)~352.86mg/kg(白水),除延安点土壤明显较低外其它试点果园土壤全氮含量差异不大,各类果园土壤硝态氮含量差异较大,而铵态氮含量差异较小;2)不同地区和不同树龄果园60 cm以上土层土壤全氮含量明显高于深层土壤,高龄果园土壤硝态氮含量明显高于低龄果园,并在100 cm以下土层出现不同程度的土壤硝态氮累积现象;3)延安果园土壤全氮、铵态氮和硝态氮含量均低于其它试点,需要增施氮肥以提高苹果产量,而凤翔、白水、长武、静宁和西峰苹果园深层土壤硝态氮积累量较高,应维持或适当减少氮肥施用量。 Contents of soil total nitrogen, ammonium nitrogen and nitrate nitrogen in 0 -300 cm soil layers of 6 -28 year-old apple orchards were measured at 6 apple production bases of Fengxiang, Baishui, Changwu, Xifeng, Yan' an and Jingning in the Loess Plateau, and profile distributions of soil total nitrogen, ammonium nitrogen and nitrate nitrogen contents between different ages of apple orchards at different sites were analyzed and compared. The results showed that the range of soil total nitrogen contents the range of soil ammonium nitrogen contents is from 5.19 is from 0. 19 g/kg (Yan' an) to 1.28 g/kg (Baishui) , mg/kg (Jingning) to 39. 46 mg/kg (Changwu), and the range of soil nitrate nitrogen contents is from 3.97 mg/kg (Yan' an) to 352.86 mg/kg (Baishui) at different sites and of different ages of apple orchards. There are not significant differences of soil total nitrogen contents in apple orchards at different sites except Yah' an where the content is obviously lower than those of other sites. The soil nitrate nitrogen contents are significantly different at different sites, while the soil ammonium nitrogen contents are less different. The soil total nitrogen contents in 0 -60 cm soil layers of the apple orchards are obviously higher than those in the deeper soil layers. The soil nitrate nitrogen contents of old apple orchards are higher than those of young apple orchards, and at the same time the nitrate nitrogen accumulation in soil profiles below 100 cm soil layers occurs in varying degrees. The contents of soil total nitrogen, ammonium nitrogen and nitrate nitrogen of apple orchards at Yan' an are obviously lower than those at other experiment sites, which means more nitrogen fertilizer should be used appropriately to increase apple yields. However, nitrate nitrogen contents in deep soil layers of apple orchards at Fengxiang, Baishui, Changwu, Jingning and Xifeng are relatively higher, hence nitrogen fertilizer utility should be kept at present level or reduced.
出处 《植物营养与肥料学报》 CAS CSCD 北大核心 2013年第2期420-429,共10页 Journal of Plant Nutrition and Fertilizers
基金 国家自然科学基金项目(31071374)资助
关键词 黄土高原 苹果园 氮素 剖面分布 the Loess Plateau apple orchard soil nitrogen profile distribution
  • 相关文献

参考文献33

二级参考文献231

共引文献782

同被引文献282

引证文献16

二级引证文献64

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部