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盆栽杉苗,应用同位素~(15)N示踪技术,研究氯化铵与硫酸铵对苗木产量的影响,氮肥利用率,以及苗木与土壤间氮素平衡的状况。结果表明:这两种氮肥对杉木苗均有明显的效果,而这两种肥料之间无显著性差异。这两种肥料对杉苗当年氮利用率稍有差异。当年土壤中残留~(15)N,施用氯化铵者高于施用硫酸铵者当年~(15)N损失量,施用氯化铵者低于施用硫酸铵者。
The potted seedlings were treated with isotopes (15) N tracer to study the effects of ammonium chloride and ammonium sulfate on the seedling yield, nitrogen use efficiency, and nitrogen balance between seedlings and soil. The results showed that both of the two nitrogen fertilizers had significant effects on Chinese fir seedlings, but no significant difference was found between the two kinds of fertilizers. The two kinds of fertilizer on Sugimoto nitrogen utilization slightly different. In that year, the residual amount of ~ (15) N in the soil was higher than that of the ammonium sulfate (15%) N when ammonium chloride was applied, and those with ammonium chloride were lower than those with ammonium sulfate.