土壤不同形态氮素在剖面中移动特征的模拟研究

应用室内土柱模拟试验方法 ,在可控水量条件下 ,研究不同水量淋溶情况下 ,土壤不同形态氮素在剖面中的分布和移动特征。研究表明 ,土壤有机氮组分中 ,氨基酸氮和 NH3- N是易于移动的形态 ,非酸解性氮则相对稳定 ;无机氮组分中 NO- 3 - N是易于移动的形态 ,NH+ 4 - N运移性差 ,非交换态 NH+ 4 - N为相对稳定形态 ;水、肥条件是决定 NO- 3 - N淋失的重要因素。研究结果为认识和掌握土壤氮素在剖面中的运移规律 ,为农田水分和氮素养分管理提供了科学依据 ;同时为深入揭示土壤中各种形态氮运移动态机制 ,展示了模拟实验技术的前景

Applying simulated experiment of artificial soil column under the condition of controllable water amount,the distribution and movement features of soil nitrogen in different forms in soil profile are studied with different water amount leaching.The result shows that nitrogen in amino acid and NH 3—N are the forms easily to move,but non acid hydrolyzable nitrogen is relatively stable in constituent of soil organic nitrogen,NO 3—N.It provides us with scientific basis for field moisture and nitrogen manage...