中国东北林区棕色针叶林土壤和暗棕壤的N养分差异性

对我国东北林区两类主要森林土壤(棕色针叶林土和暗棕壤)的N素养分的差异进行了比较研究，通过对全N含量、碱解N、氨态氮、硝态N和粘性矿物固定态铵的统计分析，认为暗棕壤较棕色针叶林土能够提供更多的速效N(硝态N和铵态N)，并具有长期的供应能力(全N，碱解N，粘性矿物固定态铵)。同时，研究结果认为速效N更容易受外界环境因子和植物生长的影响，同一类型土壤不同的样本之间的差异较大。

Comparison of Nitrogen Nutrient in Brown Coniferous Forest Soil and Dark Brown Forest Soil in Northeastern China

Soil nitrogen nutrient and its different components of two types of forest soils (brown coniferous forest soil and dark brown forest soil) in the northeast of China were studied. By statistic analysis of total nitrogen, alkali-soluble-N, exchangeable NH+ 4-N, NO- 3-N and clay-mineral-fixed NH+ 4, the result showed that dark brown forest soil could provide more fast-N than brown coniferous forest soil, and the former had a higher potential for long-term nitrogen provision. Furthermore, NO- 3-N and exchangeable NH+ 4-N fluctuated greatly for different soil samples from the same type of forest soil. The result indicates that fast-N is prone to be affected by different environmental factors and growth of different forests.