摘要
通过分析测试,研究了陕西12种农业土壤全氮(Nt),矿质态氮(Nmin)和土壤有机态氮(Norg)的组成。结果表明,供试土壤 Nmin 平均含量占土壤 Nt 的26.41%,Norg 平均占 Nt 的73.59%,土壤非代换铵是土壤矿质态氮的主体,它在 Nt 中也占相当比重.因此,土壤氮素95%以上是有机态氮的结论不符合黄土母质土壤的实际。在评价 Nmin和 Norg 对植物的营养作用时应重视土壤非代换铵在土壤全氮组成中的份额.
The composition of total soil nitrogen(Nt),mineral soil nitrogen(Nmin)andorganic soil nitrogen(Norg)of twelve different kinds of loessial soil in Shaanxi pro-vince were studied through soil testing technique.The results show that soil Nmin,soilNorg and soil Nt were 226.53±17.33ppm N,646.14±54.24 ppm N and 872.67±60.85 ppm Nin average respectively.The soil Nmin and Norg were 26.41±1.92% and 73.59±1.90% ofthe soil Nt.Non-changeable ammonium was dominant component of soil Nmin.It acco-unted for 83.84±4.44% of soil Nmin and 21.78±2.02% of soil Nt.The conclusion,that more than 95 percent of Nt is Norg,seems not fit for the loessial soils.The pro-ption of non-changeable ammonium in soil Nt should be paid great attention when ev-aluating the nutritive contribution of Nmin and Norg to plant growth.
出处
《陕西农业科学》
北大核心
1991年第2期6-7,11,共3页
Shaanxi Journal of Agricultural Sciences
