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为了探讨阔叶红松林演替与原始阔叶红松林稳定性中存在的Ｎ素机制作用，１９９１年７月、在长白山（北坡）自然保护区（海拔７４０ｍ），应用近几年建立的化学和生物化学分析方法．通过分析土壤Ｎ素及有效形态ＮＯ_３－Ｎ、ＮＨ_４－Ｎ的供应和林木的Ｎ素吸收利用状况，对原始阔叶红松林及破坏后形成的两个不同龄级的杨拌林中优势树种林木的Ｎ素营养状况及树种间Ｎ素营养关系进行了研究。结果表明：１．各样地土壤中Ｎ素及其有效形态ＮＯ_３－Ｎ、ＮＨ_４－Ｎ的含量和ＮＯ_３－Ｎ、ＮＨ_４－Ｎ的转化关系和其植被组成、土壤含水率以及ｐＨ值关系较大，特别是根层土壤Ｎ素和其上、下层土壤Ｎ素关系较密切；２．原始阔叶红松林优势树种林木在Ｎ素吸收利用和土壤供应状况上一致，且树种间在Ｎ素营养上存在着缓和竞争的关系，这是其稳定的一个重要原因；３．当更新或更替树种的幼苗、幼树对Ｎ素的吸收利用适应其所处的生态环境及其Ｎ素变化时，它们才能很好地生长、更新或更替其它树种而使群落发生演替。
In order to study the effect of N mechanism on the succession of broad-leaved Korean pine forest and the stability of the original broad-leaved Korean pine forest, in July 1991, in Changbai Mountain (North Slope) Nature Reserve (elevation 740m) And biochemical analysis methods. By analyzing the supply of N, available NO_3-N and NH_4-N and the N-uptake and utilization status of forest tree, the effects of N and N uptake and utilization on virgin and broad-leaved Korean pine forests and two different age- N nutrition status and the relationship between N nutrition among species were studied. The result shows: 1. The relationships between the N content and the contents of NO_3-N and NH_4-N and NO_3-N and NH_4-N in different kinds of soils were related to their vegetation composition, soil moisture content and pH value, especially the root layer Soil N and its upper and lower soil N closer relationship; 2. The dominant species of broad-leaved Korean pine forests are consistent in the N-uptake and utilization of soil and the supply of soil, and there is a relaxation competition among the species in N stands. This is an important reason for their stability.3. When the seedlings and saplings of saplings are replaced or replaced, the saplings can well grow, renew or replace other species to make succession when their N uptake and utilization adapt to their ecological environment and their N changes.